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Yang L, Wang Z, Xu B, Hu J, Pan D, Fan G, Zhang L, Zhou Z. A High-Performance Mn/TiO 2 Catalyst with a High Solid Content for Selective Catalytic Reduction of NO at Low-Temperatures. Molecules 2024; 29:3467. [PMID: 39124872 PMCID: PMC11313882 DOI: 10.3390/molecules29153467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2024] [Revised: 07/17/2024] [Accepted: 07/22/2024] [Indexed: 08/12/2024] Open
Abstract
Mn/TiO2 catalysts with varying solid contents were innovatively prepared by the sol-gel method and were used for selective catalytic reduction of NO at low temperatures using NH3 (NH3-SCR) as the reducing agent. Surprisingly, it was found that as the solid content of the sol increased, the catalytic activity of the developed Mn/TiO2 catalyst gradually increased, showing excellent catalytic performance. Notably, the Mn/TiO2 (50%) catalyst demonstrates outstanding denitration performance, achieving a 96% NO conversion rate at 100 °C under a volume hourly space velocity (VHSV) of 24,000 h-1, while maintaining high N2 selectivity and stability. It was discovered that as the solid content increased, the catalyst's specific surface area (SSA), surface Mn4+ concentration, chemisorbed oxygen, chemisorption of NH3, and catalytic reducibility all improved, thereby enhancing the catalytic efficiency of NH3-SCR in degrading NO. Moreover, NH3 at the Lewis acidic sites and NH4+ at the Bronsted acidic sites of the catalyst were capable of reacting with NO. Conversely, NO and NO2 adsorbed on the catalyst, along with bidentate and monodentate nitrates, were unable to react with NH3 at low temperatures. Consequently, the developed catalyst's low-temperature catalytic reaction mechanism aligns with the E-R mechanism.
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Affiliation(s)
| | | | - Bing Xu
- Hubei Provincial Engineering Technology Research Center of Agricultural and Sideline Resources, Chemical Engineering and Utilization, School of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China; (L.Y.); (Z.W.); (J.H.); (D.P.); (G.F.); (L.Z.); (Z.Z.)
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2
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Jan J, Chang CL, Chang SM. Preparation of Mn/TiO 2 catalysts using recovered manganese from spent alkaline batteries for low-temperature NH 3-SCR. JOURNAL OF HAZARDOUS MATERIALS 2024; 472:134497. [PMID: 38739957 DOI: 10.1016/j.jhazmat.2024.134497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 04/15/2024] [Accepted: 04/29/2024] [Indexed: 05/16/2024]
Abstract
Black mass (BM) from spent alkaline Zn-MnO2 batteries was used for the first time as a Mn source in the preparation of Mn/TiO2 catalysts for low-temperature NH3-selective catalytic reduction (SCR) of NOx. To recover Mn species and eliminate alkali and Zn species, BM powder underwent DI-water washing, followed by carbothermal reduction. The resulting slags were further dissolved in HNO3, loaded onto TiO2 particles with ball milling, and then subjected to calcination. Nearly 100% of Zn species were removed from the BM via carbothermal reduction at 950 °C for 4 h with 5.0 wt% activated carbon. The resulting catalyst, derived from the treated BM, achieved similar NOx conversion (97%) as the catalyst prepared using a reagent-grade Mn chemical at 160 °C but a higher NOx-to-N2 conversion rate at 78%. The promoted N2 selectivity was attributed to a high Mn4+/Ti ratio and the presence of impurities from BM, such as Fe3+ ions, which enhanced oxidation ability of the catalyst. Conversely, insufficient removal of Zn or carbon additives in the slags led to a decreased Mn concentration, an increased proportion of Mn2+/Mn3+ species, increased surface OH groups, and reduced oxidation ability on the surface, thus reducing NOx conversion and N2 selectivity.
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Affiliation(s)
- Jenyu Jan
- Institute of Environmental Engineering, National Yang Ming Chiao Tung University, No. 1001, University Road, Hsinchu 300093, Taiwan
| | - Chung-Liang Chang
- Department of Environmental Engineering and Health, Yuanpei University of Medical Technology, No.306, Yuanpei Street, Hsinchu 30015, Taiwan
| | - Sue-Min Chang
- Institute of Environmental Engineering, National Yang Ming Chiao Tung University, No. 1001, University Road, Hsinchu 300093, Taiwan.
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3
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Li X, Ren S, Chen Z, Wang M, Chen L, Chen H, Yin X. A Review of Mn-Based Catalysts for Abating NO x and CO in Low-Temperature Flue Gas: Performance and Mechanisms. Molecules 2023; 28:6885. [PMID: 37836730 PMCID: PMC10574052 DOI: 10.3390/molecules28196885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 09/09/2023] [Accepted: 09/26/2023] [Indexed: 10/15/2023] Open
Abstract
Mn-based catalysts have attracted significant attention in the field of catalytic research, particularly in NOx catalytic reductions and CO catalytic oxidation, owing to their good catalytic activity at low temperatures. In this review, we summarize the recent progress of Mn-based catalysts for the removal of NOx and CO. The effects of crystallinity, valence states, morphology, and active component dispersion on the catalytic performance of Mn-based catalysts are thoroughly reviewed. This review delves into the reaction mechanisms of Mn-based catalysts for NOx reduction, CO oxidation, and the simultaneous removal of NOx and CO. Finally, according to the catalytic performance of Mn-based catalysts and the challenges faced, a possible perspective and direction for Mn-based catalysts for abating NOx and CO is proposed. And we expect that this review can serve as a reference for the catalytic treatment of NOx and CO in future studies and applications.
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Affiliation(s)
- Xiaodi Li
- College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; (X.L.); (Z.C.); (M.W.); (L.C.); (X.Y.)
| | - Shan Ren
- College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; (X.L.); (Z.C.); (M.W.); (L.C.); (X.Y.)
| | - Zhichao Chen
- College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; (X.L.); (Z.C.); (M.W.); (L.C.); (X.Y.)
| | - Mingming Wang
- College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; (X.L.); (Z.C.); (M.W.); (L.C.); (X.Y.)
| | - Lin Chen
- College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; (X.L.); (Z.C.); (M.W.); (L.C.); (X.Y.)
| | - Hongsheng Chen
- College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; (X.L.); (Z.C.); (M.W.); (L.C.); (X.Y.)
| | - Xitao Yin
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264000, China
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4
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Chen W, Zou R, Wang X. Toward an Atomic-Level Understanding of the Catalytic Mechanism of Selective Catalytic Reduction of NO x with NH 3. ACS Catal 2022. [DOI: 10.1021/acscatal.2c03508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Weibin Chen
- School of Materials Science and Engineering, Peking University, Beijing100871, People’s Republic of China
| | - Ruqiang Zou
- School of Materials Science and Engineering, Peking University, Beijing100871, People’s Republic of China
| | - Xidong Wang
- School of Materials Science and Engineering, Peking University, Beijing100871, People’s Republic of China
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5
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Yang J, Huang Y, Su J, Chen L, Zhang M, Gao M, Yang M, Wang F, Zhang X, Shen B. Low temperature denitrification and mercury removal of Mn/TiO2-based catalysts: A review of activities, mechanisms, and deactivation. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121544] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6
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Hu D, Li W, Yin K, Huang B. Promoting effect of Ru-doped Mn/TiO2 catalysts for catalytic oxidation of chlorobenzene. NEW J CHEM 2022. [DOI: 10.1039/d2nj01070d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mn/TiO2 catalysts were synthesized using deposition-precipitation method. Ru-doped Mn/TiO2 catalysts were prepared by incipient-wetness impregnation method. To investigate the effect of Ru and Mn species, the catalytic performances of Mn/TiO2...
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7
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Zheng H, Li R, Zhong C, Li Z, Kang Y, Deng J, Song W, Zhao Z. Theoretical Design of Transition Metal-Doped TiO2 for the Selective Catalytic Reduction of NO with NH3 by DFT Calculations. Catal Sci Technol 2022. [DOI: 10.1039/d1cy02214h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Many transition metal oxides supported on TiO2 have been studied for selective catalytic reduction (SCR) of NO with NH3. However, the trade-off exists between the low-temperature activity and N2 selectivity....
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8
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Shan W, Yu Y, Zhang Y, He G, Peng Y, Li J, He H. Theory and practice of metal oxide catalyst design for the selective catalytic reduction of NO with NH3. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.05.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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9
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Li L, Ji J, Tan W, Song W, Wang X, Wei X, Guo K, Zhang W, Tang C, Dong L. Enhancing low-temperature NH3-SCR performance of Fe–Mn/CeO2 catalyst by Al2O3 modification. J RARE EARTH 2021. [DOI: 10.1016/j.jre.2021.08.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Zhang X, Zhang X, Yang X, Chen Y, Hu X, Wu X. CeMn/TiO2 catalysts prepared by different methods for enhanced low-temperature NH3-SCR catalytic performance. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2021.116588] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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11
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Wang Q, Huang X, Feng Y, Zhou J, Shi H, Jin J. Interaction Mechanism Study on Simultaneous Removal of 1,2-Dichlorobenzene and NO over MnO x–CeO 2/TiO 2 Catalysts at Low Temperatures. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.0c05862] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Qiulin Wang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
- Huzhou Institute of Zhejiang University, Huzhou 313000, China
| | - Xiaoniu Huang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Yuheng Feng
- Thermal and Environmental Engineering Institute, Tongji University, Shanghai 200092, China
| | - Jianjian Zhou
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Huancong Shi
- Huzhou Institute of Zhejiang University, Huzhou 313000, China
| | - Jing Jin
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
- Huzhou Institute of Zhejiang University, Huzhou 313000, China
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12
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Zhang X, Lv S, Zhang X, Xiao K, Wu X. Improvement of the activity and SO 2 tolerance of Sb-modified Mn/PG catalysts for NH 3-SCR at a low temperature. J Environ Sci (China) 2021; 101:1-15. [PMID: 33334506 DOI: 10.1016/j.jes.2020.07.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 07/22/2020] [Accepted: 07/29/2020] [Indexed: 06/12/2023]
Abstract
A series of MnM/palygorskite (PG) (M = La, W, Mo, Sb, Mg) catalysts was prepared by the wetness co-impregnation method for low-temperature selective catalytic reduction (SCR) of NO with NH3. Conversion efficiency followed the order Sb > Mo > La > W > Mg. A combination of various physico-chemical techniques was used to investigate the influence of Sb-modified Mn/PG catalysts. MnSb0.156/PG catalyst showed highest NO conversion at low temperatures in the presence of SO2 which reveals that addition of Sb oxides effectively enhances the SCR activity of catalysts. A SO2 step-wise study showed that MnSb0.156/PG catalyst displays higher durable resistance to SO2 than Mn/PG catalyst, where the sulfating of active phase is greatly inhibited after Sb doping. Scanning electron microscopy and X-ray diffraction results showed that Sb loading enhances the dispersion of Mn oxides on the carrier surface. According to the results of characterization analyses, it is suggested that the main reason for the deactivation of Mn/PG is the formation of manganese sulfates which cause the permanent deactivation of Mn-based catalysts. For Sb-doped Mn/PG catalyst, SOx ad-species formed were mainly combined with SbOx rather than MnOx. This preferential interaction between SbOx and SO2 effectively shields the MnOx as active species from being sulfated by SO2 resulting in the improvement of SO2 tolerance on Sb-added catalyst. Multiple information support that, owing to the addition of Sb, original formed MnOx crystallite has been completely transformed into highly dispersed amorphous phase accounting for higher SCR activity.
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Affiliation(s)
- Xianlong Zhang
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China; Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, Hefei University of Technology, Hefei 230009, China
| | - Shuangshuang Lv
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
| | - Xincheng Zhang
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
| | - Kesong Xiao
- Instrumental Analysis Center, Hefei University of Technology, Hefei 230009, China
| | - Xueping Wu
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China.
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13
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Yang R, Fan Y, Ye R, Tang Y, Cao X, Yin Z, Zeng Z. MnO 2 -Based Materials for Environmental Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2004862. [PMID: 33448089 DOI: 10.1002/adma.202004862] [Citation(s) in RCA: 149] [Impact Index Per Article: 37.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 08/31/2020] [Indexed: 06/12/2023]
Abstract
Manganese dioxide (MnO2 ) is a promising photo-thermo-electric-responsive semiconductor material for environmental applications, owing to its various favorable properties. However, the unsatisfactory environmental purification efficiency of this material has limited its further applications. Fortunately, in the last few years, significant efforts have been undertaken for improving the environmental purification efficiency of this material and understanding its underlying mechanism. Here, the aim is to summarize the recent experimental and computational research progress in the modification of MnO2 single species by morphology control, structure construction, facet engineering, and element doping. Moreover, the design and fabrication of MnO2 -based composites via the construction of homojunctions and MnO2 /semiconductor/conductor binary/ternary heterojunctions is discussed. Their applications in environmental purification systems, either as an adsorbent material for removing heavy metals, dyes, and microwave (MW) pollution, or as a thermal catalyst, photocatalyst, and electrocatalyst for the degradation of pollutants (water and gas, organic and inorganic) are also highlighted. Finally, the research gaps are summarized and a perspective on the challenges and the direction of future research in nanostructured MnO2 -based materials in the field of environmental applications is presented. Therefore, basic guidance for rational design and fabrication of high-efficiency MnO2 -based materials for comprehensive environmental applications is provided.
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Affiliation(s)
- Ruijie Yang
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China
| | - Yingying Fan
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China
| | - Ruquan Ye
- Department of Chemistry, State Key Lab of Marine Pollution, City University of Hong Kong, Hong Kong, 999077, P. R. China
| | - Yuxin Tang
- College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, P. R. China
| | - Xiehong Cao
- College of Materials Science and Engineering, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou, Zhejiang, 310014, P. R. China
| | - Zongyou Yin
- Research School of Chemistry, Australian National University, Canberra, ACT, 2601, Australia
| | - Zhiyuan Zeng
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China
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14
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Performance Evaluation of a Novel Thermal Power Plant Process with Low-Temperature Selective Catalytic Reduction. ENERGIES 2020. [DOI: 10.3390/en13215558] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We present the concept of a novel thermal power plant process in conjunction with low-temperature selective catalytic reduction (SCR). This process can be employed to achieve modern standards for NOx emissions and solve problems related to post-gas cleaning processes, such as thermal fatigue, catalyst damage, and an increase in differential pressure in the boiler. Therefore, this study is aimed at evaluating the performance of a novel flue-gas cleaning process for use in a thermal power plant, where a low-temperature SCR is implemented, along with the existing SCR. We developed a process model for a large-scale power plant, in which the thermal power plant was divided into a series of heat exchanger block models. The mass and energy balances were solved by considering the heat transfer interaction between the hot and cold sides to obtain the properties of each material flow. Using the process model, we performed a simulation of the new process. New optimal operating conditions were derived, and the effects that the new facilities have on the existing process were evaluated. The results show that the new process is feasible in terms of operating stability and cost, as well as showing an increase in the boiler thermal efficiency of up to 1.3%.
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15
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Zhao L, Kang M. Mechanism and regeneration of sulfur-poisoned Mn-promoted calcined NiAl hydrotalcite-like compounds for C 3H 6-SCR of NO. RSC Adv 2020; 10:3716-3725. [PMID: 35492661 PMCID: PMC9049091 DOI: 10.1039/c9ra09087h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2019] [Accepted: 12/16/2019] [Indexed: 11/30/2022] Open
Abstract
The selective catalytic reduction of NO with propene (C3H6-SCR) in the presence of SO2 was investigated over a series of Mn-promoted calcined NiAl hydrotalcite-like compounds. The obtained 5% MnNiAlO catalyst exhibits superior NO conversion efficiency (95%) at 240 °C, and excellent sulfur-poisoning resistance. The possible reaction pathways of the catalytic process were proposed according to several characterization measurements. It is demonstrated that Mn-promoted NiAlO catalysts enhance the Brønsted acid sites and surface active oxygen groups, and improve the redox properties by the redox cycle (Ni3+ + Mn2+ ↔ Ni2+ + Mn4+). Thus, the amount of the reaction intermediates is improved, and the reactivities between CxHyOz species and nitrite/nitrate species are promoted. Furthermore, in the presence of SO2, the MnNiAlO samples can give rise to minor formation of sulfate and inhibit the competitive adsorption effectively due to their nitrite/nitrate species being more abundant and stable. Finally, regeneration was studied using in situ FTIR and the water washing method showed the best performance on the regeneration of S-poisoned catalysts. The selective catalytic reduction of NO with propene (C3H6-SCR) in the presence of SO2 was investigated over a series of Mn-promoted calcined NiAl hydrotalcite-like compounds.![]()
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Affiliation(s)
- Ling Zhao
- School of Ecology and Environment, Inner Mongolia University China .,Center for Environmental and Human Toxicology, Department of Physiological Sciences, College of Veterinary Medicine, University of Florida USA
| | - Mengdi Kang
- School of Ecology and Environment, Inner Mongolia University China
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16
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Zhu N, Shan W, Lian Z, Zhang Y, Liu K, He H. A superior Fe-V-Ti catalyst with high activity and SO 2 resistance for the selective catalytic reduction of NO x with NH 3. JOURNAL OF HAZARDOUS MATERIALS 2020; 382:120970. [PMID: 31465945 DOI: 10.1016/j.jhazmat.2019.120970] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 07/28/2019] [Accepted: 08/05/2019] [Indexed: 06/10/2023]
Abstract
A series of Fe-V-Ti oxide catalysts were prepared by a co-precipitation method, among which the Fe0.1V0.1TiOx catalyst showed the optimal NH3-SCR performance and excellent SO2 resistance. Fe0.1V0.1TiOx achieved > 90% NOx conversion at 225-450 °C under a GHSV of 200,000 h-1. When introducing SO2 and H2O to the SCR reaction for 24 h, the NOx conversion maintained a level above 93% at 250 °C. The Raman and Mössbauer spectra showed that FeVO4 and Fe2O3 coexisted on the surface of TiO2. In Fe-V-Ti catalysts, the charge interaction between Fe2O3 and FeVO4 as well as the electronic inductive effect between Fe and V species resulted in the improvement of SCR activity and N2 selectivity at high temperatures. The NH3-SCR process on the Fe0.1V0.1TiOx catalyst mainly followed the Eley-Rideal (E-R) reaction mechanism with gaseous NO reacting with adsorbed NH3 adsorbed species.
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Affiliation(s)
- Na Zhu
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wenpo Shan
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Ningbo Urban Environment Observation and Research Station-NUEORS, Institute of Urban Environment, Chinese Academy of Sciences, Ningbo 315800, China.
| | - Zhihua Lian
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Yan Zhang
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Ningbo Urban Environment Observation and Research Station-NUEORS, Institute of Urban Environment, Chinese Academy of Sciences, Ningbo 315800, China
| | - Kuo Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Hong He
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China; Ningbo Urban Environment Observation and Research Station-NUEORS, Institute of Urban Environment, Chinese Academy of Sciences, Ningbo 315800, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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17
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Effects of Mo addition on the NH3-SCR of NO reaction over MoaMnTi10Ox (a=0.2, 0.4, 0.6 and 0.8): Synergistic action between redox and acidity. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.03.048] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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18
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Lin F, Wang Q, Zhang J, Jin J, Lu S, Yan J. Mechanism and Kinetics Study on Low-Temperature NH3-SCR Over Manganese–Cerium Composite Oxide Catalysts. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b04780] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Feng Lin
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, China
| | - Qiulin Wang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, China
| | - Jianchao Zhang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, China
| | - Jing Jin
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, China
| | - Shengyong Lu
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China
| | - Jianhua Yan
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China
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19
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Xu Y, Wu X, Cao L, Ma Y, Ran R, Si Z, Weng D, Ma Z, Wang B. Crystal orientation-dependent activity of tungsten-based catalysts for selective catalytic reduction of NO with NH3. J Catal 2019. [DOI: 10.1016/j.jcat.2019.06.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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20
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Wang F, Xie Z, Liang J, Fang B, Piao Y, Hao M, Wang Z. Tourmaline-Modified FeMnTiO x Catalysts for Improved Low-Temperature NH 3-SCR Performance. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:6989-6996. [PMID: 31184128 DOI: 10.1021/acs.est.9b02620] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Low temperature NH3 selective catalytic reduction (NH3-SCR) technology is an efficient and economical strategy for cutting NO x emissions from power-generating equipment. In this study, a novel and highly efficient NH3-SCR catalyst, tourmaline-modified FeMnTiO x is presented, which was synthesized by a simple one-step sol-gel method. We found that the amount of tourmaline has an important impact on the catalytic performance of the modified FeMnTiO x-based catalysts, and the NO x conversion exceeded 80% from 160 to 380 °C with the addition of 5 wt % tourmaline. Compared with the pure FeMnTiO x, the catalytic efficiency at a temperature below 100 °C was increased by nearly 18.9%, and the operation temperature window was broadened significantly. The enhanced catalytic performance of the FeMnTiO x catalyst was mainly attributed to the small spherical nanoparticles structure around the tourmaline powders, resulting in the increased content of Mn3+, Mn4+, and chemical oxygen on the catalytic surface. These as-developed tourmaline-modified FeMnTiO x materials have been demonstrated to be promising as a new type highly efficient low temperature NH3-SCR catalyst.
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Affiliation(s)
- Fei Wang
- Key Laboratory of Special Functional Materials for Ecological Environment and Information , Hebei University of Technology, Ministry of Education , Tianjin 300130 , P. R. China
- Institute of Power Source and Ecomaterials Science , Hebei University of Technology , Tianjin 300130 , P. R. China
| | - Zhibo Xie
- Key Laboratory of Special Functional Materials for Ecological Environment and Information , Hebei University of Technology, Ministry of Education , Tianjin 300130 , P. R. China
- Institute of Power Source and Ecomaterials Science , Hebei University of Technology , Tianjin 300130 , P. R. China
| | - Jinsheng Liang
- Key Laboratory of Special Functional Materials for Ecological Environment and Information , Hebei University of Technology, Ministry of Education , Tianjin 300130 , P. R. China
- Institute of Power Source and Ecomaterials Science , Hebei University of Technology , Tianjin 300130 , P. R. China
| | - Baizeng Fang
- Department of Chemical & Biological Engineering , University of British Columbia , 2360 East Mall , Vancouver , British Columbia V6T 1Z3 , Canada
| | - Yu'ang Piao
- Key Laboratory of Special Functional Materials for Ecological Environment and Information , Hebei University of Technology, Ministry of Education , Tianjin 300130 , P. R. China
- Institute of Power Source and Ecomaterials Science , Hebei University of Technology , Tianjin 300130 , P. R. China
| | - Ming Hao
- Key Laboratory of Special Functional Materials for Ecological Environment and Information , Hebei University of Technology, Ministry of Education , Tianjin 300130 , P. R. China
- Institute of Power Source and Ecomaterials Science , Hebei University of Technology , Tianjin 300130 , P. R. China
| | - Zishuo Wang
- Key Laboratory of Special Functional Materials for Ecological Environment and Information , Hebei University of Technology, Ministry of Education , Tianjin 300130 , P. R. China
- Institute of Power Source and Ecomaterials Science , Hebei University of Technology , Tianjin 300130 , P. R. China
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21
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Yang Y, Hu Z, Mi R, Li D, Yong X, Yang H, Liu K. Effect of initial support particle size of MnO x /TiO 2 catalysts in the selective catalytic reduction of NO with NH 3. RSC Adv 2019; 9:4682-4692. [PMID: 35514617 PMCID: PMC9060628 DOI: 10.1039/c8ra10077b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 01/19/2019] [Indexed: 11/25/2022] Open
Abstract
A series of manganese-based catalysts supported by 5-10 nm, 10-25 nm, 40 nm and 60 nm anatase TiO2 particles was synthesized via an impregnation method to investigate the effect of the initial support particle size on the selective catalytic reduction (SCR) of NO with NH3. All catalysts were characterized by transmission electron microscopy (TEM), N2 physisorption/desorption, X-ray diffraction (XRD), temperature programmed techniques, X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance infrared transform spectroscopy (DRIFTS). TEM results indicated that the particle sizes of the MnO x /TiO2 catalysts were similar after the calcination process, although the initial TiO2 support particle sizes were different. However, the initial TiO2 support particle sizes were found to have a significant influence on the SCR catalytic performance. XPS and NH3-TPD results of the MnO x /TiO2 catalysts illustrated that the surface Mn4+/Mn molar ratio and acid amount could be influenced by the initial TiO2 support particle sizes. The order of surface Mn4+/Mn molar ratio and acid amount over the MnO x /TiO2 catalysts was as follows: MnO x /TiO2(10-25) > MnO x /TiO2(40) > MnO x /TiO2(60) > MnO x /TiO2(5-10), which agreed well with the order of SCR performance. In situ DRIFTS results revealed that the NH3-SCR reactions over MnO x /TiO2 at low temperature occurred via a Langmuir-Hinshelwood mechanism. More importantly, it was found that the bridge and bidentate nitrates were the main active substances for the low-temperature SCR reaction, and bridge nitrate adsorbed on Mn4+ showed superior SCR activity among all the adsorbed NO x species. The variation of the initial TiO2 support particle size over MnO x /TiO2 could change the surface Mn4+/Mn molar ratio, which could influence the adsorption of NO x species, thus bringing about the diversity of the SCR catalytic performance.
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Affiliation(s)
- Yang Yang
- Institute of Industrial Catalysis, School of Chemical Engineering and Technology, Xi'an Jiaotong University Xi'an Shaanxi 710049 China +86-29-82663189 +86-29-82663189
- Sinochem Modern Environmental Protection Chemicals (Xi'an) Co. LTD. Xi'an Shaanxi 710201 China
| | - Zhun Hu
- Institute of Industrial Catalysis, School of Chemical Engineering and Technology, Xi'an Jiaotong University Xi'an Shaanxi 710049 China +86-29-82663189 +86-29-82663189
| | - Rongli Mi
- Institute of Industrial Catalysis, School of Chemical Engineering and Technology, Xi'an Jiaotong University Xi'an Shaanxi 710049 China +86-29-82663189 +86-29-82663189
| | - Dan Li
- Institute of Industrial Catalysis, School of Chemical Engineering and Technology, Xi'an Jiaotong University Xi'an Shaanxi 710049 China +86-29-82663189 +86-29-82663189
| | - Xiang Yong
- Institute of Industrial Catalysis, School of Chemical Engineering and Technology, Xi'an Jiaotong University Xi'an Shaanxi 710049 China +86-29-82663189 +86-29-82663189
| | - Huie Yang
- Sinochem Modern Environmental Protection Chemicals (Xi'an) Co. LTD. Xi'an Shaanxi 710201 China
| | - Kunfeng Liu
- Sinochem Modern Environmental Protection Chemicals (Xi'an) Co. LTD. Xi'an Shaanxi 710201 China
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22
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Zeng Y, Wang Y, Zhang S, Zhong Q. A study on the NH 3-SCR performance and reaction mechanism of a cost-effective and environment-friendly black TiO 2 catalyst. Phys Chem Chem Phys 2018; 20:22744-22752. [PMID: 30140807 DOI: 10.1039/c8cp02270d] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper, black TiO2 without adding active components was developed for NH3-SCR-DeNOx. The catalytic activity tests showed that the NO removal efficiency of black TiO2 was always greater than 90% at 330-390 °C, which almost reached that of the commercial NH3-SCR-DeNOx catalyst. XRD, UV-vis, TG, EPR, XPS, H2-TPR, DFT and NH3-TPD analyses were carried out to study the structure-effectiveness relationship. We found that a large number of oxygen vacancies were formed over the black TiO2 surface. It was not only promoted the adsorption of NH3via direct (oxygen vacancies as Lewis acid sites for NH3 adsorption) and indirect (oxygen vacancies promote the formation of surface hydroxyl groups, which are Brønsted acid sites for NH3 adsorption) forms, but also improved the redox properties by promoting the reduction of Ti4+ to Ti3+. These changes lead to the superior catalytic activity of black TiO2 for NH3-SCR-DeNOx. Additionally, an in situ DRIFT study demonstrated that the NH3-SCR-DeNOx reaction over black TiO2 occurred via the Eley-Rideal (E-R) mechanism. Finally, the catalytic stability and resistance to H2O and SO2 of the black TiO2 catalyst were studied, and it showed good performances. This study offered new and important insights into the understanding of the role of oxygen vacancies in determining the physical and chemical properties of catalysts.
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Affiliation(s)
- Yiqing Zeng
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China.
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23
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Yuan H, Sun N, Chen J, Jin J, Wang H, Hu P. Insight into the NH3-Assisted Selective Catalytic Reduction of NO on β-MnO2(110): Reaction Mechanism, Activity Descriptor, and Evolution from a Pristine State to a Steady State. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02114] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Haiyang Yuan
- Key Laboratory for Advanced Materials, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
| | - Ningning Sun
- Key Laboratory for Advanced Materials, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
| | - Jianfu Chen
- Key Laboratory for Advanced Materials, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
| | - Jiamin Jin
- Key Laboratory for Advanced Materials, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
| | - Haifeng Wang
- Key Laboratory for Advanced Materials, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
| | - Peijun Hu
- Key Laboratory for Advanced Materials, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
- School of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, U.K
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24
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Lu P, Yue H, Xing Y, Wei J, Zeng Z, Li R, Wu W. Low-temperature co-purification of NO x and Hg 0 from simulated flue gas by Ce xZr yMn zO 2/r-Al 2O 3: the performance and its mechanism. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:20575-20590. [PMID: 29748813 DOI: 10.1007/s11356-018-2199-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 04/30/2018] [Indexed: 06/08/2023]
Abstract
In this study, series of CexZryMnzO2/r-Al2O3 catalysts were prepared by impregnation method and explored to co-purification of NOx and Hg0 at low temperature. The physical and chemical properties of the catalysts were investigated by XRD, BET, FTIR, NH3-TPD, H2-TPR, and XPS. The experimental results showed that 10% Ce0.2Zr0.3Mn0.5O2/r-Al2O3 yielded higher conversion on co-purification of NOx and Hg0 than the other prepared catalysts at low temperature, especially at 200-300 °C. 91% and 97% convert rate of NOx and Hg0 were obtained, respectively, when 10% Ce0.2Zr0.3Mn0.5O2/r-Al2O3 catalyst was used at 250 °C. Moreover, the presence of H2O slightly decreased the removal of NOx and Hg0 owing to the competitive adsorption of H2O and Hg0. When SO2 was added, the removal of Hg0 first increased slightly and then presented a decrease due to the generation of SO3 and (NH4)2SO4. The results of NH3-TPD indicated that the strong acid of 10% Ce0.2Zr0.3Mn0.5O2/r-Al2O3 improved its high-temperature activity. XPS and H2-TPR results showed there were high-valence Mn and Ce species in 10% Ce0.2Zr0.3Mn0.5O2/r-Al2O3, which could effectively promote the removal of NOx and Hg0. Therefore, the mechanisms of Hg0 and NOx removal were proposed as Hg (ad) + [O] → HgO (ad), and 2NH3/NH4+ (ad) + NO2 (ad) + NO (g) → 2 N2 + 3H2O/2H+, respectively. Graphical abstract ᅟ.
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Affiliation(s)
- Pei Lu
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, China
| | - Huifang Yue
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, China
| | - Yi Xing
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, China.
| | - Jianjun Wei
- Department of Nanoscience, Joint School of Nanoscience and Nanoengineering, University of North Carolina at Greensboro, Greensboro, North Carolina, 27401, USA.
| | - Zheng Zeng
- Department of Nanoscience, Joint School of Nanoscience and Nanoengineering, University of North Carolina at Greensboro, Greensboro, North Carolina, 27401, USA
| | - Rui Li
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, China
| | - Wanrong Wu
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, China
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25
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Zhang Y, Huang T, Xiao R, Xu H, Shen K, Zhou C. A comparative study on the Mn/TiO 2-M(M = Sn, Zr or Al) O x catalysts for NH 3-SCR reaction at low temperature. ENVIRONMENTAL TECHNOLOGY 2018; 39:1284-1294. [PMID: 28504006 DOI: 10.1080/21622515.2017.1329345] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Accepted: 05/07/2017] [Indexed: 06/07/2023]
Abstract
A series of TiO2-M(M = Sn, Zr or Al) Ox were prepared and manganese oxide (MnOx) was supported on the carrier by the traditional impregnation method for low-temperature selective catalytic reduction (SCR) of NOx with ammonia as a reductant. The obtained catalysts were characterized by XRD, BET, high-resolution transmission electron microscope (HRTEM), H2-TPR, NH3-TPD, X-ray photoelectron spectroscopy (XPS) and in situ Fourier-transform infrared (FT-IR) and their catalytic activities for NOx reduction with NH3 in the presence of SO2 were investigated comparatively. The results showed that the highest NOx conversion of over 90% could be obtained with the Mn/Ti-Sn catalyst at a wide range of temperature window of 150-270°C. The combination of characterization techniques, such as BET, XRD and HRTEM, revealed that manganese oxides were well dispersed on Ti-Sn. H2-TPR suggested that Ti-Sn and Ti-Zr supports could enhance the reduction ability of catalysts. Accordingly, Mn/Ti-Al exhibited worse activity at low temperature. XPS results were in good agreement with H2-TPR results, and Mn/Ti-Sn had more surface-reducible species of Mn4+ ions and more surface-adsorbed oxygen species, which was conducive to SCR reaction. The in situ FT-IR spectra of NH3 adsorption indicated that all the modified catalysts had more Lewis acid sites and the amide species at 1506 cm-1 had a certain influence on the catalytic reaction at low temperature. Mn/Ti-Zr showed a stronger resistance to SO2 but Mn/Ti-Al was affected more adversely and all the catalysts could not be restored to the initial catalytic activity after stopping feeding SO2. NH3-TPD revealed that the total acid amount of the Mn/Ti-Sn sample was larger than other samples, which indicated that the Ti-Sn solid solution could provide more surface acid sites over the catalyst.
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Affiliation(s)
- Yaping Zhang
- a Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment , Southeast University , Nanjing , People's Republic of China
| | - Tianjiao Huang
- a Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment , Southeast University , Nanjing , People's Republic of China
| | - Rui Xiao
- a Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment , Southeast University , Nanjing , People's Republic of China
| | - Haitao Xu
- a Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment , Southeast University , Nanjing , People's Republic of China
| | - Kai Shen
- a Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment , Southeast University , Nanjing , People's Republic of China
| | - Changcheng Zhou
- a Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment , Southeast University , Nanjing , People's Republic of China
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26
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Effect of iron doping on SO2 and H2O resistance of honeycomb cordierite-based Mn–Ce/Al2O3 catalyst for NO removal at low temperature. RESEARCH ON CHEMICAL INTERMEDIATES 2018. [DOI: 10.1007/s11164-018-3297-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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27
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Zheng S, Song L, Tang S, Liu C, Yue H, Liang B. Insight into the synergism between MnO 2 and acid sites over Mn-SiO 2@TiO 2 nano-cups for low-temperature selective catalytic reduction of NO with NH 3. RSC Adv 2018; 8:1979-1986. [PMID: 35542593 PMCID: PMC9077400 DOI: 10.1039/c7ra11868f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 12/23/2017] [Indexed: 01/20/2023] Open
Abstract
The rational synthesis of low-temperature catalysts with high catalytic activity and stability is highly desirable for the selective catalytic reduction of NO with NH3. Here we synthesized a Mn-SiO2/TiO2 nano-cup catalyst via the coating of the mesoporous TiO2 layers on SiO2 spheres and subsequent inlay of MnO2 nanoparticles in the narrow annulus. This catalyst exhibited superior catalytic SCR activities and stability for low-temperature selective catalytic reduction of NO with NH3, with NO conversion of ∼100%, N2 selectivity above 90% at a temperature ∼140 °C. The characterization results, such as BET, XRD, H2-TPR, O2/NH3-TPD and XPS, indicated that this nano-cup structure catalyst possesses high concentration and dispersion of Mn4+ active species, strong chemisorbed O- or O2 2- species and highly stable MnO X active components over the annular structures of the TiO2 shell and SiO2 sphere, and thus enhanced the low-temperature SCR performance.
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Affiliation(s)
- Siyi Zheng
- Multi-phases Mass Transfer and Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University Chengdu 610065 China +86 22 85997677 +86 22 85997677
| | - Lei Song
- Multi-phases Mass Transfer and Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University Chengdu 610065 China +86 22 85997677 +86 22 85997677
| | - Siyang Tang
- Multi-phases Mass Transfer and Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University Chengdu 610065 China +86 22 85997677 +86 22 85997677
| | - Changjun Liu
- Multi-phases Mass Transfer and Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University Chengdu 610065 China +86 22 85997677 +86 22 85997677
- Institute of New Energy and Low-Carbon Technology, Sichuan University Chengdu 610207 China
| | - Hairong Yue
- Multi-phases Mass Transfer and Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University Chengdu 610065 China +86 22 85997677 +86 22 85997677
| | - Bin Liang
- Multi-phases Mass Transfer and Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University Chengdu 610065 China +86 22 85997677 +86 22 85997677
- Institute of New Energy and Low-Carbon Technology, Sichuan University Chengdu 610207 China
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28
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Template-free synthesis of hierarchically macro-mesoporous Mn-TiO2 catalysts for selective reduction of NO with NH3. Front Chem Sci Eng 2017. [DOI: 10.1007/s11705-017-1679-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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29
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A Review on Selective Catalytic Reduction of NOx by NH3 over Mn–Based Catalysts at Low Temperatures: Catalysts, Mechanisms, Kinetics and DFT Calculations. Catalysts 2017. [DOI: 10.3390/catal7070199] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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30
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Geng Y, Chen X, Yang S, Liu F, Shan W. Promotional Effects of Ti on a CeO 2-MoO 3 Catalyst for the Selective Catalytic Reduction of NO x with NH 3. ACS APPLIED MATERIALS & INTERFACES 2017; 9:16951-16958. [PMID: 28471163 DOI: 10.1021/acsami.6b05380] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this study, Ti was doped to CeO2-MoO3 to promote the catalytic performance for the selective catalytic reduction of NOx with NH3 (NH3-SCR). The preparation method for CeMo0.5TiaOx (a = 0, 1, 2, 5, 10) catalysts was a stepwise precipitation method. When Ti was doped, all of the Ce-Mo-Ti catalysts exhibited remarkably improved NOx conversion and N2 selectivity than the CeMo0.5Ox without Ti. The CeMo0.5Ti5Ox with excellent activity in a broad temperature range was selected as an optimal catalyst to investigate the effects of Ti addition. The formation process analysis of the CeMo0.5Ti5Ox showed that, the Mo and Ti species first precipitated together from the mixed solution with the increase of pH, and then Ce species precipitated onto the Mo-Ti precipitates. The obtained catalyst exhibited remarkably facilitated NOx and NH3 adsorption, enhanced charge imbalance, promoted redox property, and improved surface acidity, which are all important reasons for the excellent catalytic performance of an NH3-SCR catalyst.
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Affiliation(s)
- Yang Geng
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, People's Republic of China
| | - Xiaoling Chen
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, People's Republic of China
| | - Shijian Yang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, People's Republic of China
| | - Fudong Liu
- Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - Wenpo Shan
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, People's Republic of China
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31
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Zhang S, Zhao Y, Wang Z, Zhang J, Wang L, Zheng C. Integrated removal of NO and mercury from coal combustion flue gas using manganese oxides supported on TiO 2. J Environ Sci (China) 2017; 53:141-150. [PMID: 28372738 DOI: 10.1016/j.jes.2015.10.038] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 10/11/2015] [Accepted: 10/21/2015] [Indexed: 06/07/2023]
Abstract
A catalyst composed of manganese oxides supported on titania (MnOx/TiO2) synthesized by a sol-gel method was selected to remove nitric oxide and mercury jointly at a relatively low temperature in simulated flue gas from coal-fired power plants. The physico-chemical characteristics of catalysts were investigated by X-ray fluorescence (XRF), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analyses, etc. The effects of Mn loading, reaction temperature and individual flue gas components on denitration and Hg0 removal were examined. The results indicated that the optimal Mn/Ti molar ratio was 0.8 and the best working temperature was 240°C for NO conversion. O2 and a proper ratio of [NH3]/[NO] are essential for the denitration reaction. Both NO conversion and Hg0 removal efficiency could reach more than 80% when NO and Hg0 were removed simultaneously using Mn0.8Ti at 240°C. Hg0 removal efficiency slightly declined as the Mn content increased in the catalysts. The reaction temperature had no significant effect on Hg0 removal efficiency. O2 and HCl had a promotional effect on Hg0 removal. SO2 and NH3 were observed to weaken Hg0 removal because of competitive adsorption. NO first facilitated Hg0 removal and then had an inhibiting effect as NO concentration increased without O2, and it exhibited weak inhibition of Hg0 removal efficiency in the presence of O2. The oxidation of Hg0 on MnOx/TiO2 follows the Mars-Maessen and Langmuir-Hinshelwood mechanisms.
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Affiliation(s)
- Shibo Zhang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yongchun Zhao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Zonghua Wang
- Henan Institute of Metallurgy Co., Ltd., Zhengzhou 450053, China; Research Center of Quality Inspection, Analysis and Test of Henan Academy of Sciences, Zhengzhou 450008, China
| | - Junying Zhang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Lulu Wang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Chuguang Zheng
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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32
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Wang H, Qu Z, Dong S, Tang C. Mechanistic Investigation into the Effect of Sulfuration on the FeW Catalysts for the Selective Catalytic Reduction of NO x with NH 3. ACS APPLIED MATERIALS & INTERFACES 2017; 9:7017-7028. [PMID: 28177220 DOI: 10.1021/acsami.6b14031] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Iron tungsten (FeW) catalyst is a potential candidate for the selective catalytic reduction (SCR) of NOx with ammonia because of its excellent performance in a wide operating window. Sulfur poisoning effects in SCR catalysts have long been recognized as a challenge in development of efficient catalysts for applications. In this paper, the impact of sulfuration on catalyst structure, NH3-SCR reaction performance and mechanism was systematically investigated through spectroscopic and temperature-programmed approaches. The sulfuration inhibited the SCR activity at low temperatures (<300 °C), while no evident effect was observed at high temperatures (≥300 °C). After sulfuration for FeW oxides catalyst, the organic-like with covalent S═O bonds sulfate species were mainly formed over the FeW catalysts. Combining TPD with in situ DRIFTS results, it was found that the Lewis and the Brønsted acidity were enhanced by the interaction between metal species and sulfate species due to the strong electron withdrawing effect of the S═O double bonds. The in situ DRIFTS study showed that the formation of NO2 was hindered, leading to the "fast-SCR" pathway was partly cut off by the sulfuration process and thereby the loss of SCR activity at low temperatures. However, the Langmuir-Hinshelwood reaction pathway between adsorbed NH3/NH4+ species and nitrate species was facilitated and dominated at high temperatures, making the as-synthesized FeW catalysts resistant to SO2 poisoning.
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Affiliation(s)
- Hui Wang
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Sciences and Technology, Dalian University of Technology , Linggong Road 2, Dalian, 116024, China
| | - Zhenping Qu
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Sciences and Technology, Dalian University of Technology , Linggong Road 2, Dalian, 116024, China
| | - Shicheng Dong
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Sciences and Technology, Dalian University of Technology , Linggong Road 2, Dalian, 116024, China
| | - Chen Tang
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Sciences and Technology, Dalian University of Technology , Linggong Road 2, Dalian, 116024, China
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33
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Guo RT, Li MY, Sun P, Liu SM, Wang SX, Pan WG, Liu SW, Liu J, Sun X. The enhanced resistance to P species of an Mn–Ti catalyst for selective catalytic reduction of NOx with NH3 by the modification with Mo. RSC Adv 2017. [DOI: 10.1039/c7ra01876b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The modification of Mn–Ti catalyst by Mo could enhance its resistance to P species.
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Affiliation(s)
- Rui-tang Guo
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Ming-yuan Li
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Peng Sun
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Shu-ming Liu
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Shu-xian Wang
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Wei-guo Pan
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Shuai-wei Liu
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Jian Liu
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Xiao Sun
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
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34
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Zhang S, Zhang B, Liu B, Sun S. A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NOx with NH3: reaction mechanism and catalyst deactivation. RSC Adv 2017. [DOI: 10.1039/c7ra03387g] [Citation(s) in RCA: 102] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The reactions over Mn-containing selective catalytic reduction (SCR) catalysts.
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Affiliation(s)
- Shengen Zhang
- Institute for Advanced Materials and Technology
- University of Science and Technology Beijing
- Beijing 100083
- PR China
| | - Bolin Zhang
- Institute for Advanced Materials and Technology
- University of Science and Technology Beijing
- Beijing 100083
- PR China
| | - Bo Liu
- Institute for Advanced Materials and Technology
- University of Science and Technology Beijing
- Beijing 100083
- PR China
| | - Shuailing Sun
- Institute for Advanced Materials and Technology
- University of Science and Technology Beijing
- Beijing 100083
- PR China
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35
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Peng L, Huan L, Huayan L, Yinfei C, Zekai Z. Influence of tungsten on the NH3-SCR activity of MnWOx/TiO2 catalysts. RSC Adv 2017. [DOI: 10.1039/c7ra00427c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A series of bulk MnWOx and supported MnWOx/TiO2 catalysts with MnWO4 structure were prepared via self-propagating high-temperature synthesis (SHS), co-precipitation and impregnation methods.
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Affiliation(s)
- Lu Peng
- Department of Energy Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310014
- China
| | - Li Huan
- Department of Energy Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310014
- China
| | - Liu Huayan
- Department of Energy Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310014
- China
| | - Chen Yinfei
- Department of Energy Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310014
- China
| | - Zhang Zekai
- Department of Energy Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310014
- China
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36
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Xu J, Li H, Liu Y, Huang L, Zhang J, Shi L, Zhang D. In situ fabrication of porous MnCoxOy nanocubes on Ti mesh as high performance monolith de-NOx catalysts. RSC Adv 2017. [DOI: 10.1039/c7ra03182c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Porous MnCoxOy nanocubes on Ti mesh as monolith catalysts present enhanced de-NOx performance.
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Affiliation(s)
- Jing Xu
- Research Center of Nano Science and Technology
- School of Material Science and Engineering
- Shanghai University
- Shanghai 200444
- China
| | - Hongrui Li
- Research Center of Nano Science and Technology
- School of Material Science and Engineering
- Shanghai University
- Shanghai 200444
- China
| | - Yan Liu
- Research Center of Nano Science and Technology
- School of Material Science and Engineering
- Shanghai University
- Shanghai 200444
- China
| | - Lei Huang
- Research Center of Nano Science and Technology
- School of Material Science and Engineering
- Shanghai University
- Shanghai 200444
- China
| | - Jianping Zhang
- Research Center of Nano Science and Technology
- School of Material Science and Engineering
- Shanghai University
- Shanghai 200444
- China
| | - Liyi Shi
- Research Center of Nano Science and Technology
- School of Material Science and Engineering
- Shanghai University
- Shanghai 200444
- China
| | - Dengsong Zhang
- Research Center of Nano Science and Technology
- School of Material Science and Engineering
- Shanghai University
- Shanghai 200444
- China
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37
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Shan W, Geng Y, Chen X, Huang N, Liu F, Yang S. A highly efficient CeWOx catalyst for the selective catalytic reduction of NOx with NH3. Catal Sci Technol 2016. [DOI: 10.1039/c5cy01282a] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Characterization was used to investigate the main reasons for the highly efficient NOx abatement by the CeWOx catalyst.
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Affiliation(s)
- Wenpo Shan
- School of Environmental and Biological Engineering
- Nanjing University of Science and Technology
- Nanjing 210094
- PR China
| | - Yang Geng
- School of Environmental and Biological Engineering
- Nanjing University of Science and Technology
- Nanjing 210094
- PR China
| | - Xiaoling Chen
- School of Environmental and Biological Engineering
- Nanjing University of Science and Technology
- Nanjing 210094
- PR China
| | - Nan Huang
- School of Environmental and Biological Engineering
- Nanjing University of Science and Technology
- Nanjing 210094
- PR China
| | - Fudong Liu
- Materials Sciences Division
- Lawrence Berkeley National Laboratory
- Berkeley 94720
- USA
| | - Shijian Yang
- School of Environmental and Biological Engineering
- Nanjing University of Science and Technology
- Nanjing 210094
- PR China
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38
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Li W, Guo RT, Wang SX, Pan WG, Chen QL, Li MY, Sun P, Liu SM. The enhanced performance of a CeSiOx support on a Mn/CeSiOx catalyst for selective catalytic reduction of NOx with NH3. RSC Adv 2016. [DOI: 10.1039/c6ra18821d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A series of Mn/CeSiOx catalysts were prepared by the wet impregnation method and used for selective catalytic reduction of NO with NH3.
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Affiliation(s)
- Wei Li
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Rui-tang Guo
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Shu-xian Wang
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Wei-guo Pan
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Qi-lin Chen
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Ming-yuan Li
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Peng Sun
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
| | - Shu-ming Liu
- School of Energy Source and Mechanical Engineering
- Shanghai University of Electric Power
- Shanghai
- P. R. China
- Shanghai Engineering Research Center of Power Generation Environment Protection
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39
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Song W, Liu J, Zheng H, Ma S, Wei Y, Duan A, Jiang G, Zhao Z, Hensen EJM. A mechanistic DFT study of low temperature SCR of NO with NH3 on MnCe1−xO2(111). Catal Sci Technol 2016. [DOI: 10.1039/c5cy01597a] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mechanism of low temperature SCR of NO with NH3 catalyzed by MnCe1−xO2(111) has been explored by density functional theory.
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Affiliation(s)
- Weiyu Song
- State Key Laboratory of Heavy Oil
- College of Science
- China University of Petroleum – Beijing
- Beijing 102249
- PR China
| | - Jian Liu
- State Key Laboratory of Heavy Oil
- College of Science
- China University of Petroleum – Beijing
- Beijing 102249
- PR China
| | - Huiling Zheng
- State Key Laboratory of Heavy Oil
- College of Science
- China University of Petroleum – Beijing
- Beijing 102249
- PR China
| | - Sicong Ma
- State Key Laboratory of Heavy Oil
- College of Science
- China University of Petroleum – Beijing
- Beijing 102249
- PR China
| | - Yuechang Wei
- State Key Laboratory of Heavy Oil
- College of Science
- China University of Petroleum – Beijing
- Beijing 102249
- PR China
| | - Aijun Duan
- State Key Laboratory of Heavy Oil
- College of Science
- China University of Petroleum – Beijing
- Beijing 102249
- PR China
| | - Guiyuan Jiang
- State Key Laboratory of Heavy Oil
- College of Science
- China University of Petroleum – Beijing
- Beijing 102249
- PR China
| | - Zhen Zhao
- State Key Laboratory of Heavy Oil
- College of Science
- China University of Petroleum – Beijing
- Beijing 102249
- PR China
| | - Emiel J. M. Hensen
- Inorganic Materials Chemistry
- Eindhoven University of Technology
- 5600 MB Eindhoven
- The Netherlands
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40
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Schill L, Putluru SSR, Jensen AD, Fehrmann R. MnFe/Al2O3 Catalyst Synthesized by Deposition Precipitation for Low-Temperature Selective Catalytic Reduction of NO with NH3. Catal Letters 2015. [DOI: 10.1007/s10562-015-1576-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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41
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Gao X, Li L, Song L, Lu T, Zhao J, Liu Z. Highly dispersed MnOx nanoparticles supported on three-dimensionally ordered macroporous carbon: a novel nanocomposite for catalytic reduction of NOx with NH3 at low temperature. RSC Adv 2015. [DOI: 10.1039/c4ra16141f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel MnOx/3DOMC nanocomposite is fabricated via a simple multicomponent infiltration of three-dimensionally ordered templates, and exhibits superior NH3-SCR of NOx performance.
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Affiliation(s)
- Xin Gao
- Institute of Chemistry for Functionalized Materials
- Faculty of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian 116029
- China
| | - Ling Li
- Faculty of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian
- China
| | - Lihong Song
- Institute of Chemistry for Functionalized Materials
- Faculty of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian 116029
- China
| | - Ting Lu
- Faculty of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian
- China
| | - Jiaxin Zhao
- Faculty of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian
- China
| | - Zhi Liu
- Institute of Chemistry for Functionalized Materials
- Faculty of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian 116029
- China
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42
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Xiong S, Liao Y, Dang H, Qi F, Yang S. Promotion mechanism of CeO2addition on the low temperature SCR reaction over MnOx/TiO2: a new insight from the kinetic study. RSC Adv 2015. [DOI: 10.1039/c5ra01767j] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A new insight into CeO2addition on the SCR reaction over MnOx/TiO2was drawn according to steady-state kinetic analysis.
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Affiliation(s)
- Shangchao Xiong
- School of Environmental and Biological Engineering
- Nanjing University of Science and Technology
- Nanjing
- P. R. China
| | - Yong Liao
- School of Environmental and Biological Engineering
- Nanjing University of Science and Technology
- Nanjing
- P. R. China
| | - Hao Dang
- School of Environmental and Biological Engineering
- Nanjing University of Science and Technology
- Nanjing
- P. R. China
| | - Feihong Qi
- School of Environmental and Biological Engineering
- Nanjing University of Science and Technology
- Nanjing
- P. R. China
| | - Shijian Yang
- School of Environmental and Biological Engineering
- Nanjing University of Science and Technology
- Nanjing
- P. R. China
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43
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Synthesis of manganese oxide supported on mesoporous titanium oxide: Influence of the block copolymer. J SOLID STATE CHEM 2015. [DOI: 10.1016/j.jssc.2014.10.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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Sun C, Tang Y, Gao F, Sun J, Ma K, Tang C, Dong L. Effects of different manganese precursors as promoters on catalytic performance of CuO–MnOx/TiO2 catalysts for NO removal by CO. Phys Chem Chem Phys 2015; 17:15996-6006. [DOI: 10.1039/c5cp02158h] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Since the formation of the surface synergetic oxygen vacancy SSOV (Cu+–□–Mn3+) in the xCuyMn(N)/TiO2 catalyst is easier than that (Cu+–□–Mn2+) in the xCuyMn(A)/TiO2 catalyst, the activity of the xCuyMn(N)/TiO2 catalyst is higher than that of the xCuyMn(A)/TiO2 catalyst.
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Affiliation(s)
- Chuanzhi Sun
- College of Chemistry
- Chemical Engineering and Materials Science
- Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
| | - Yingjie Tang
- College of Chemistry
- Chemical Engineering and Materials Science
- Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
| | - Fei Gao
- Center of Modern Analysis
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Jingfang Sun
- Center of Modern Analysis
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Kaili Ma
- Key Laboratory of Mesoscopic Chemistry of Ministry of Education
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Changjin Tang
- Key Laboratory of Mesoscopic Chemistry of Ministry of Education
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Lin Dong
- Center of Modern Analysis
- Nanjing University
- Nanjing 210093
- P. R. China
- Key Laboratory of Mesoscopic Chemistry of Ministry of Education
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45
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Xiong S, Liao Y, Xiao X, Dang H, Yang S. The mechanism of the effect of H2O on the low temperature selective catalytic reduction of NO with NH3 over Mn–Fe spinel. Catal Sci Technol 2015. [DOI: 10.1039/c4cy01599a] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
H2O effect on NO reduction over Mn–Fe spinel was related to the competition adsorption and the decrease in oxidation ability.
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Affiliation(s)
- Shangchao Xiong
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse
- School of Environmental and biological Engineering
- Nanjing University of Science and technology
- Nanjing
- 210094 PR China
| | - Yong Liao
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse
- School of Environmental and biological Engineering
- Nanjing University of Science and technology
- Nanjing
- 210094 PR China
| | - Xin Xiao
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse
- School of Environmental and biological Engineering
- Nanjing University of Science and technology
- Nanjing
- 210094 PR China
| | - Hao Dang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse
- School of Environmental and biological Engineering
- Nanjing University of Science and technology
- Nanjing
- 210094 PR China
| | - Shijian Yang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse
- School of Environmental and biological Engineering
- Nanjing University of Science and technology
- Nanjing
- 210094 PR China
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46
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Zhang XL, Lv SS, Zhang CP, Wu XP, Zhang LF, Wang JW, Jia XB, Zhang HJ. Effect of SO2 on SCR activity of MnOx/PG catalysts at low temperature. CHEMICAL PAPERS 2015. [DOI: 10.1515/chempap-2015-0175] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractPalygorskite (PG)-supported manganese oxide catalysts (MnOx/PG) were prepared for the selective catalytic reduction (SCR) of NO with ammonia in the presence of SO
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47
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Yoon DY, Lim E, Kim YJ, Cho BK, Nam IS, Choung JW, Yoo S. A combinatorial chemistry method for fast screening of perovskite-based NO oxidation catalyst. ACS COMBINATORIAL SCIENCE 2014; 16:614-23. [PMID: 25321326 DOI: 10.1021/co5000344] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A fast parallel screening method based on combinatorial chemistry (combichem) has been developed and applied in the screening tests of perovskite-based oxide (PBO) catalysts for NO oxidation to hit a promising PBO formulation for the oxidation of NO to NO2. This new method involves three consecutive steps: oxidation of NO to NO2 over a PBO catalyst, adsorption of NOx onto the PBO and K2O/Al2O3, and colorimetric assay of the NOx adsorbed thereon. The combichem experimental data have been used for determining the oxidation activity of NO over PBO catalysts as well as three critical parameters, such as the adsorption efficiency of K2O/Al2O3 for NO2 (α) and NO (β), and the time-average fraction of NO included in the NOx feed stream (ξ). The results demonstrated that the amounts of NO2 produced over PBO catalysts by the combichem method under transient conditions correlate well with those from a conventional packed-bed reactor under steady-state conditions. Among the PBO formulations examined, La0.5Ag0.5MnO3 has been identified as the best chemical formulation for oxidation of NO to NO2 by the present combichem method and also confirmed by the conventional packed-bed reactor tests. The superior efficiency of the combichem method for high-throughput catalyst screening test validated in this study is particularly suitable for saving the time and resources required in developing a new formulation of PBO catalyst whose chemical composition may have an enormous number of possible variations.
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Affiliation(s)
- Dal Young Yoon
- School
of Environmental Science and Engineering/Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang 790-784, Republic of Korea
| | - Eunho Lim
- School
of Environmental Science and Engineering/Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang 790-784, Republic of Korea
| | - Young Jin Kim
- School
of Environmental Science and Engineering/Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang 790-784, Republic of Korea
| | - Byong K. Cho
- School
of Environmental Science and Engineering/Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang 790-784, Republic of Korea
| | - In-Sik Nam
- School
of Environmental Science and Engineering/Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang 790-784, Republic of Korea
| | - Jin Woo Choung
- Exhaust Emission Engineering Team, Research & Development Division, Power Train R&D Center, Hyundai Motor Company, 772-1 Jangduk-dong, Hwaseong 445-706, Republic of Korea
| | - Seungbeom Yoo
- Exhaust Emission Engineering Team, Research & Development Division, Power Train R&D Center, Hyundai Motor Company, 772-1 Jangduk-dong, Hwaseong 445-706, Republic of Korea
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48
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49
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FANG Z, LIN T, XU H, WU G, SUN M, CHEN Y. Novel promoting effects of cerium on the activities of NOx reduction by NH3 over TiO2-SiO2-WO3 monolith catalysts. J RARE EARTH 2014. [DOI: 10.1016/s1002-0721(14)60168-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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50
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Yang S, Xiong S, Liao Y, Xiao X, Qi F, Peng Y, Fu Y, Shan W, Li J. Mechanism of N2O formation during the low-temperature selective catalytic reduction of NO with NH3 over Mn-Fe spinel. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:10354-10362. [PMID: 25105802 DOI: 10.1021/es502585s] [Citation(s) in RCA: 125] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The mechanism of N2O formation during the low-temperature selective catalytic reduction reaction (SCR) over Mn-Fe spinel was studied. The in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and transient reaction studies demonstrated that the Eley-Rideal mechanism (i.e., the reaction of adsorbed NH3 species with gaseous NO) and the Langmuir-Hinshelwood mechanism (i.e., the reaction of adsorbed NH3 species with adsorbed NOx species) both contributed to N2O formation. However, N2O selectivity of NO reduction over Mn-Fe spinel through the Langmuir-Hinshelwood mechanism was much less than that through the Eley-Rideal mechanism. The ratio of NO reduction over Mn-Fe spinel through the Langmuir-Hinshelwood mechanism remarkably increased; therefore, N2O selectivity of NO reduction over Mn-Fe spinel decreased with the decrease of the gas hourly space velocity (GHSV). As the gaseous NH3 concentration increased, N2O selectivity of NO reduction over Mn-Fe spinel increased because of the promotion of NO reduction through the Eley-Rideal mechanism. Meanwhile, N2O selectivity of NO reduction over Mn-Fe spinel decreased with the increase of the gaseous NO concentration because the formation of NH on Mn-Fe spinel was restrained. Therefore, N2O selectivity of NO reduction over Mn-Fe spinel was related to the GHSV and concentrations of reactants.
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Affiliation(s)
- Shijian Yang
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, People's Republic of China
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