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Lv Z, He G, Zhang W, Liu J, Lian Z, Yang Y, Yan Z, Xu G, Shan W, Yu Y, He H. Interface sites on vanadia-based catalysts are highly active for NO x removal under realistic conditions. J Environ Sci (China) 2024; 136:523-536. [PMID: 37923461 DOI: 10.1016/j.jes.2022.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 09/29/2022] [Accepted: 10/07/2022] [Indexed: 11/07/2023]
Abstract
TiO2-supported V2O5 catalysts are commonly used in NOx reduction with ammonia due to their robust catalytic performance. Over these catalysts, it is generally considered that the active species are mainly derived from the vanadia species rather than the intrinsic structure of V-O-Ti entities, namely the interface sites. To reveal the role of V-O-Ti entities in NH3-SCR, herein, we prepared TiO2/V2O5 catalysts and demonstrated that V-O-Ti entities were more active for NOx reduction under wet conditions than the V sites (V=O) working alone. On the V-O-Ti entities, kinetic measurements and first principles calculations revealed that NH3 activation exhibited a much lower energy barrier than that on V=O sites. Under wet conditions, the V-O-Ti interface significantly inhibited the transformation of V=O to V-OH sites thus benefiting NH3 activation. Under wet conditions, meanwhile, the migration of NH4+ from Ti site neighboring the V-O-Ti interface to Ti site of the V-O-Ti interface was exothermic; thus, V-O-Ti entities together with neighboring Ti sites could serve as channels linking NH3 pool and active centers for activation of NH4+. This finding reveals that the V-O-Ti interface sites on V-based catalysts play a crucial role in NOx removal under realistic conditions, providing a new perspective on NH3-SCR mechanism.
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Affiliation(s)
- Zhihui Lv
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guangzhi He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wenshuo Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jingjing Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, 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
| | - Yang Yang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Zidi Yan
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China
| | - Guangyan Xu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, 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 Research Center for Urban Environment, Chinese Academy of Sciences, Ningbo 315800, China
| | - Yunbo Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; 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; Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China.
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; 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.
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2
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Zhang Y, Wan Y, Liu X, Chen K, Chu K. Nb-doped NiO nanoflowers for nitrite electroreduction to ammonia. iScience 2023; 26:107944. [PMID: 37810221 PMCID: PMC10558769 DOI: 10.1016/j.isci.2023.107944] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 07/20/2023] [Accepted: 09/14/2023] [Indexed: 10/10/2023] Open
Abstract
Electrocatalytic reduction of nitrite to ammonia (NO2RR) is considered as an appealing route to simultaneously achieve sustainable ammonia production and abate hazardous nitrite pollution. Herein, atomically Nb-doped NiO nanoflowers are designed as a high-performance NO2RR catalyst, which exhibits the highest NH3-Faradaic efficiency of 92.4% with an NH3 yield rate of 200.5 μmol h-1 cm-2 at -0.6 V RHE. Theoretical calculations unravel that Nb dopants can act as Lewis acid sites to render effective NO2- activation, decreased protonation energy barriers, and restricted hydrogen evolution, ultimately leading to a high NO2RR selectivity and activity.
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Affiliation(s)
- Ying Zhang
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
| | - Yuying Wan
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
| | - Xiaoxu Liu
- College of Science, Hebei North University, Zhangjiakou, Hebei 075000, China
| | - Kai Chen
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
| | - Ke Chu
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
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3
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Bhaskaran A, Sharma D, Roy S, Singh SA. Technological solutions for NO x, SO x, and VOC abatement: recent breakthroughs and future directions. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:91501-91533. [PMID: 37495811 DOI: 10.1007/s11356-023-28840-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 07/13/2023] [Indexed: 07/28/2023]
Abstract
NOx, SOx, and carbonaceous volatile organic compounds (VOCs) are extremely harmful to the environment, and their concentrations must be within the limits prescribed by the region-specific pollution control boards. Thus, NOx, SOx, and VOC abatement is essential to safeguard the environment. Considering the importance of NOx, SOx, and VOC abatement, the discussion on selective catalytic reduction, oxidation, redox methods, and adsorption using noble metal and non-noble metal-based catalytic approaches were elaborated. This article covers different thermal treatment techniques, category of materials as catalysts, and its structure-property insights along with the advanced oxidation processes and adsorption. The defect engineered catalysts with lattice oxygen vacancies, bi- and tri-metallic noble metal catalysts and non-noble metal catalysts, modified metal organic frameworks, mixed-metal oxide supports, and their mechanisms have been thoroughly reviewed. The main hurdles and potential achievements in developing novel simultaneous NOx, SOx, and VOC removal technologies are critically discussed to envisage the future directions. This review highlights the removal of NOx, SOx, and VOC through material selection, properties, and mechanisms to further improve the existing abatement methods in an efficient way.
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Affiliation(s)
- Aathira Bhaskaran
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Hyderabad, 500078, India
| | - Deepika Sharma
- Department of Chemical Engineering, Birla Institute of Technology and Science Pilani, Pilani Campus, Pilani, 333031, India
| | - Sounak Roy
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Hyderabad, 500078, India
- Materials Center for Sustainable Energy & Environment, Birla Institute of Technology and Science Pilani Hyderabad Campus, Hyderabad, 500078, India
| | - Satyapaul A Singh
- Materials Center for Sustainable Energy & Environment, Birla Institute of Technology and Science Pilani Hyderabad Campus, Hyderabad, 500078, India.
- Department of Chemical Engineering, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Hyderabad, 500078, India.
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4
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Promotion effect of niobium on ceria catalyst for selective catalytic reduction of NO with NH3. J RARE EARTH 2021. [DOI: 10.1016/j.jre.2021.10.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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5
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Synthesis of bulk vanadium oxide with a large surface area using organic acids and its low-temperature NH3-SCR activity. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.06.041] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Liu C, Han J, Bi Y, Wang J, Guo M, Liu Q. A novel Cerium-Tin composite oxide catalyst with high SO2 tolerance for selective catalytic reduction of NOx with NH3. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.07.085] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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7
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SO2 Poisoning and Recovery of Copper-Based Activated Carbon Catalysts for Selective Catalytic Reduction of NO with NH3 at Low Temperature. Catalysts 2020. [DOI: 10.3390/catal10121426] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A series of materials based on activated carbon (AC) with copper deposited in various amounts were prepared using an incipient wetness impregnation method and tested as catalysts for selective catalytic reduction of nitrogen oxides with ammonia. The samples were poisoned with SO2 and regenerated in order to analyze their susceptibility to deactivation by the harmful component of exhaust gas. NO conversion over the fresh catalyst doped with 10 wt.% of Cu reached 81% of NO conversion at 140 °C and about 90% in the temperature range of 260–300 °C. The rate of poisoning with SO2 was dependent on Cu loading, but in general, it lowered NO conversion due to the formation of (NH4)2SO4 deposits that blocked the active sites of the catalysts. After regeneration, the catalytic activity of the materials was restored and NO conversion exceeded 70% for all of the samples.
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8
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Recent Progress on Improving Low-Temperature Activity of Vanadia-Based Catalysts for the Selective Catalytic Reduction of NOx with Ammonia. Catalysts 2020. [DOI: 10.3390/catal10121421] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Selective catalytic reduction of NOx with NH3 (NH3-SCR) has been successfully applied to abate NOx from diesel engines and coal-fired industries on a large scale. Although V2O5-WO3(MoO3)/TiO2 catalysts have been utilized in commercial applications, novel vanadia-based catalysts have been recently developed to meet the increasing requirements for low-temperature catalytic activity. In this article, recent progress on the improvement of the low-temperature activity of vanadia-based catalysts is reviewed, including modification with metal oxides and nonmetal elements and the use of novel supports, different synthesis methods, metal vanadates and specific structures. Investigation of the NH3-SCR reaction mechanism, especially at low temperatures, is also emphasized. Finally, for low-temperature NH3-SCR, some suggestions are given regarding the opportunities and challenges of vanadia-based catalysts in future research.
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9
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Kuma R, Kitano T, Tsujiguchi T, Tanaka T. Deactivation Mechanism and Enhanced Durability of V
2
O
5
/TiO
2
–SiO
2
–MoO
3
Catalysts for NH
3
−SCR in the Presence of SO
2. ChemCatChem 2020. [DOI: 10.1002/cctc.202001155] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ryoji Kuma
- New Energy Materials Research Department Nippon Shokubai Co. Ltd. Himeji Hyogo 671-1292 Japan
| | - Tomoyuki Kitano
- Analysis Technology Center Nippon Shokubai Co. Ltd. Suita Osaka 564-0034 Japan
| | - Takuya Tsujiguchi
- New Energy Materials Research Department Nippon Shokubai Co. Ltd. Himeji Hyogo 671-1292 Japan
| | - Tsunehiro Tanaka
- Department of Molecular Engineering Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB) Kyoto University Kyoto 615-8510 Japan
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10
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Abubakar A, Li C, Huangfu L, Gao S, Yu J. Simultaneous removal of particulates and NO by the catalytic bag filter containing V2O5-MoO3/TiO2. KOREAN J CHEM ENG 2020. [DOI: 10.1007/s11814-020-0486-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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Li G, Wu Q, Wang S, Li J, You X, Shao S, Wen M, Xu L, Tang Y, Wang F, Wang Y, Liu K. Promoting SO 2 Resistance of a CeO 2(5)-WO 3(9)/TiO 2 Catalyst for Hg 0 Oxidation via Adjusting the Basicity and Acidity Sites Using a CuO Doping Method. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:1889-1897. [PMID: 31889439 DOI: 10.1021/acs.est.9b04465] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The competition between SO2 and elemental mercury (Hg0) for active sites was an important factor for suppressing the Hg0 oxidation properties of catalysts. There were obvious differences in properties of basicity and acidity between SO2 and Hg0. Raising the SO2 resistance via adjusting the basicity and acidity sites of catalysts was promising for reducing the competition between SO2 and Hg0. This study aimed to form multiple active sites with different basicities via Cu, Fe, Mn, and Sn doping. The results indicated that Cu doping had the best modification performance. Five percent CuO doping could significantly improve the SO2 resistance of CuO(5)-CeO2(5)-WO3(9)/TiO2 and increase the mercury oxidation efficiency (MOE) from 54.7 to 85.5% in the condition (6% O2, 100 ppm NO, 100 ppm NH3, and 100 ppm SO2). CO2 temperature-programmed desorption analysis showed that CuO(5)-CeO2(5)-WO3(9)/TiO2 exhibited weak basic sites (CeO2), medium-strong basic sites (Cu-O-Ce), and strong basic sites (CuO). Therefore, the CuO in the Ce-O-Cu structure was prioritized for the reaction with acid gas SO2 and protected CeO2 from SO2 poisoning. This study prepared a highly SO2-resistant catalyst for Hg0 oxidation. This research and development will be conducive for use in Hg0 oxidation in actual coal-fired flue gases.
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Affiliation(s)
- Guoliang Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
- State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex , Beijing 100084 , China
| | - Qingru Wu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
- State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex , Beijing 100084 , China
| | - Shuxiao Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
- State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex , Beijing 100084 , China
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
- State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex , Beijing 100084 , China
| | - Xiaoqing You
- Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education , Tsinghua University , Beijing 100084 , China
- Center for Combustion Energy , Tsinghua University , Beijing 100084 , China
| | - Sen Shao
- Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education , Tsinghua University , Beijing 100084 , China
- Center for Combustion Energy , Tsinghua University , Beijing 100084 , China
| | - Minneng Wen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
- State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex , Beijing 100084 , China
| | - Liwen Xu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
- State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex , Beijing 100084 , China
| | - Yi Tang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
- State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex , Beijing 100084 , China
| | - Fengyang Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
- State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex , Beijing 100084 , China
| | - Yu Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
- State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex , Beijing 100084 , China
| | - Kaiyun Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
- State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex , Beijing 100084 , China
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12
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Raja S, Alphin MS, Sivachandiran L. Promotional effects of modified TiO2- and carbon-supported V2O5- and MnOx-based catalysts for the selective catalytic reduction of NOx: a review. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01348j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This review presents the promotional effects of transition metal modification over TiO2- and carbon-supported V2O5- and MnOx-based SCR catalysts.
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Affiliation(s)
- S. Raja
- Department of Mechanical Engineering
- Sri Sivasubramaniya Nadar College of Engineering
- Kalavakkam 603110
- India
| | - M. S. Alphin
- Department of Mechanical Engineering
- Sri Sivasubramaniya Nadar College of Engineering
- Kalavakkam 603110
- India
| | - L. Sivachandiran
- Department of chemistry
- SRM Institute of Science and Technology
- Chennai
- India
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13
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Wang J, Lu P, Su W, Xing Y, Li R, Li Y, Zhu T, Yue H, Cui Y. Study on the denitrification performance of Fe xLa yO z/activated coke for NH 3-SCR and the effect of CO escaped from activated coke at mid-high temperature on catalytic activity. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:20248-20263. [PMID: 31098908 DOI: 10.1007/s11356-019-05090-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Accepted: 04/04/2019] [Indexed: 06/09/2023]
Abstract
Currently, activated coke is widely used in the removal of multiple pollutants from industrial flue gas. In this paper, a series of novel FexLayOz/AC catalysts was prepared by the incipient wetness impregnation for NH3-SCR denitrification reaction. The introduction of Fe-La bimetal oxides significantly improved the denitrification performance of activated coke at mid-high temperature, and 4% Fe0.3La0.7O1.5/AC exhibited a superior NOx conversion efficiency of 90.1% at 400 °C. The catalysts were further characterized by BET, SEM, XRD, Raman, EPR, XPS, FTIR, NH3-TPD, H2-TPR, et al., whose results showed that the perovskite-type oxide of LaFeO3 and oxygen vacancies were produced on the catalysts' surfaces during roasting. Fe-La doping enhanced the amount of acid sites (mainly Lewis and other stronger acid sites) and the content of multifarious oxygen species, which were beneficial for NOx removal at mid-high temperature. Moreover, it was investigated that the effect of released CO from activated coke at mid-high temperature on the NOx removal through the lifetime test, in which it was found that a large amount of CO produced by pyrolysis of activated coke could promote the NOx removal, and long-term escaping of CO on the activated coke carrier did not have a significant negative impact on catalytic performance. The results of the TG-IR test showed that volatile matter is released from the activated coke while TG results showed that the weight loss rate of 4% Fe0.3La0.7O1.5/AC only was 0.0015~0.007%/min at 300-400 °C. Hence, 4% Fe0.3La0.7O1.5/AC had excellent thermal stability and denitrification performance to be continuously used at mid-high temperature. Finally, the mechanisms were proposed on the basis of experiments and characterization results.
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Affiliation(s)
- Jiaqing Wang
- State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Pei Lu
- State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Wei Su
- State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
| | - Yi Xing
- State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
| | - Rui Li
- State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Yuran Li
- National Engineering Laboratory for Cleaner Hydrometallurgical Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
| | - Tingyu Zhu
- National Engineering Laboratory for Cleaner Hydrometallurgical Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
| | - Huifang Yue
- State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Yongkang Cui
- State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
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14
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Lian Z, Shan W, Wang M, He H, Feng Q. The balance of acidity and redox capability over modified CeO 2 catalyst for the selective catalytic reduction of NO with NH 3. J Environ Sci (China) 2019; 79:273-279. [PMID: 30784451 DOI: 10.1016/j.jes.2018.11.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 11/21/2018] [Accepted: 11/22/2018] [Indexed: 06/09/2023]
Abstract
The effect of acidity and redox capability over sulfuric acid-modified CeO2 catalysts were studied for the selective catalytic reduction of NOx with NH3 (NH3-SCR). The deposition of sulfate significantly enhanced the catalytic performance over CeO2. NOx conversion over 4H2SO4/CeO2 at 230-440 °C was higher than 90%. The strong redox capability of CeO2 could result in unselective NH3 oxidation and decrease high temperatures catalytic activity and N2 selectivity. The deposition of sulfate increased the acidity and weakened the redox capability, and then increased the high temperature NOx conversion and N2 selectivity. An appropriate level of acidity also promoted the activity at 190-250 °C over ceria-based catalysts, and with further increase in the acidity, the SCR activity decreased slightly. Weak redox capability lowered the low-temperature catalytic activity. Excellent SCR activity requires a balance of acidity and redox capability on the catalysts.
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Affiliation(s)
- 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.
| | - 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
| | - Meng Wang
- 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
| | - 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; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Qingcai Feng
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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15
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Liu S, Feng X, Liu J, Lin Q, Xiong L, Wang Y, Xu H, Wang J, Chen Y. Investigation of the selective catalytic reduction of NO with NH 3 over the WO 3/Ce 0.68Zr 0.32O 2 catalyst: the role of H 2O in SO 2 inhibition. NEW J CHEM 2019. [DOI: 10.1039/c8nj04939d] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect of H2O and SO2 on the selective catalytic reduction of NOx by NH3 (NH3-SCR) over WO3/Ce0.68Zr0.32O2 at 250 °C was systematically investigated using various characterization techniques.
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Affiliation(s)
- Shuang Liu
- College of Chemistry
- Sichuan University
- Sichuan
- P. R. China
| | - Xi Feng
- Sinocat Environmental Technology Co., Ltd
- Chengdu 611731
- P. R. China
| | - Jingying Liu
- College of Chemistry
- Sichuan University
- Sichuan
- P. R. China
| | - Qingjin Lin
- College of Chemistry
- Sichuan University
- Sichuan
- P. R. China
| | - Lei Xiong
- College of Chemistry
- Sichuan University
- Sichuan
- P. R. China
| | - Yun Wang
- Sinocat Environmental Technology Co., Ltd
- Chengdu 611731
- P. R. China
| | - Haidi Xu
- Institute of New Energy and Low-Carbon Technology
- Sichuan University
- Chengdu 610064
- P. R. China
- Sichuan Provincial Environment Protection Environmental Catalytic Materials Engineering Technology Center
| | - Jianli Wang
- College of Chemistry
- Sichuan University
- Sichuan
- P. R. China
- Sichuan Provincial Environment Protection Environmental Catalytic Materials Engineering Technology Center
| | - Yaoqiang Chen
- College of Chemistry
- Sichuan University
- Sichuan
- P. R. China
- Institute of New Energy and Low-Carbon Technology
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16
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Zhang B, Liebau M, Suprun W, Liu B, Zhang S, Gläser R. Suppression of N2O formation by H2O and SO2 in the selective catalytic reduction of NO with NH3 over a Mn/Ti–Si catalyst. Catal Sci Technol 2019. [DOI: 10.1039/c9cy01156k] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Proposed mechanism of NO reduction and N2O formation as well as H2O/SO2 suppression effects with participation of (a) Lewis acid sites and (b) Brønsted acid sites over a Mn/Ti–Si catalyst.
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Affiliation(s)
- Bolin Zhang
- Institute for Advanced Materials and Technology
- University of Science and Technology Beijing
- 100083 Beijing
- China
- Institute of Chemical Technology
| | - Michael Liebau
- Institute of Chemical Technology
- Universität Leipzig
- 04103 Leipzig
- Germany
| | - Wladimir Suprun
- Institute of Chemical Technology
- Universität Leipzig
- 04103 Leipzig
- Germany
| | - Bo Liu
- Institute for Advanced Materials and Technology
- University of Science and Technology Beijing
- 100083 Beijing
- China
| | - Shengen Zhang
- Institute for Advanced Materials and Technology
- University of Science and Technology Beijing
- 100083 Beijing
- China
| | - Roger Gläser
- Institute of Chemical Technology
- Universität Leipzig
- 04103 Leipzig
- Germany
| |
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