1
|
Cheng S, Xu F, Yang S, Zhang B, Song W, Zhu X, Tan W, Sun C, Dong L. Modulating the Activity and SO 2 Resistance of α-Fe 2O 3 Catalysts for NH 3-SCR of NO x via Crystal Facet Engineering. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:8955-8965. [PMID: 38718175 DOI: 10.1021/acs.est.4c00276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
The development of Fe-based catalysts for the selective catalytic reduction of NOx by NH3 (NH3-SCR of NOx) has garnered significant attention due to their exceptional SO2 resistance. However, the influence of different sulfur-containing species (e.g., ferric sulfates and ammonium sulfates) on the NH3-SCR activity of Fe-based catalysts as well as its dependence on exposed crystal facets of Fe2O3 has not been revealed. This work disclosed that nanorod-like α-Fe2O3 (Fe2O3-NR) predominantly exposing (110) facet performed better than nanosheet-like α-Fe2O3 (Fe2O3-NS) predominantly exposing (001) facet in NH3-SCR reaction, due to the advantages of Fe2O3-NR in redox properties and surface acidity. Furthermore, the results of the SO2/H2O resistance test at a critical temperature of 250 °C, catalytic performance evaluations on Fe2O3-NR and Fe2O3-NS sulfated by SO2 + O2 or deposited with NH4HSO4 (ABS), and systematic characterization revealed that the reactivity of ammonium sulfates on Fe2O3 catalysts to NO(+O2) contributed to their improved catalytic performance, while ferric sulfates showed enhancing and inhibiting effects on NH3-SCR activity on Fe2O3-NR and Fe2O3-NS, respectively; despite this, Fe2O3-NR showed higher affinity for SO2 + O2. This work set a milestone in understanding the NH3-SCR reaction on Fe2O3 catalysts in the presence of SO2 from the aspect of crystal facet engineering.
Collapse
Affiliation(s)
- Siqing Cheng
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, Institute of Materials and Clean Energy, Shandong Normal University, Jinan 250014, P. R. China
| | - Fang Xu
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, Institute of Materials and Clean Energy, Shandong Normal University, Jinan 250014, P. R. China
| | - Shan Yang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, Institute of Materials and Clean Energy, Shandong Normal University, Jinan 250014, P. R. China
| | - Bifeng Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Wang Song
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Xuechen Zhu
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, Institute of Materials and Clean Energy, Shandong Normal University, Jinan 250014, P. R. China
| | - Wei Tan
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Chuanzhi Sun
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, Institute of Materials and Clean Energy, Shandong Normal University, Jinan 250014, P. R. China
| | - Lin Dong
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| |
Collapse
|
2
|
Fu Y, Ding W, Lei H, Sun Y, Du J, Yu Y, Simon U, Chen P, Shan Y, He G, He H. Spatial Distribution of Brønsted Acid Sites Determines the Mobility of Reactive Cu Ions in the Cu-SSZ-13 Catalyst during the Selective Catalytic Reduction of NO x with NH 3. J Am Chem Soc 2024; 146:11141-11151. [PMID: 38600025 DOI: 10.1021/jacs.3c13725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
The formation of dimer-Cu species, which serve as the active sites of the low-temperature selective catalytic reduction of NOx with NH3 (NH3-SCR), relies on the mobility of CuI species in the channels of the Cu-SSZ-13 catalysts. Herein, the key role of framework Brønsted acid sites in the mobility of reactive Cu ions was elucidated via a combination of density functional theory calculations, in situ impedance spectroscopy, and in situ diffuse reflectance ultraviolet-visible spectroscopy. When the number of framework Al sites decreases, the Brønsted acid sites decrease, leading to a systematic increase in the diffusion barrier for [Cu(NH3)2]+ and less formation of highly reactive dimer-Cu species, which inhibits the low-temperature NH3-SCR reactivity and vice versa. When the spatial distribution of Al sites is uneven, the [Cu(NH3)2]+ complexes tend to migrate from an Al-poor cage to an Al-rich cage (e.g., cage with paired Al sites), which effectively accelerates the formation of dimer-Cu species and hence promotes the SCR reaction. These findings unveil the mechanism by which framework Brønsted acid sites influence the intercage diffusion and reactivity of [Cu(NH3)2]+ complexes in Cu-SSZ-13 catalysts and provide new insights for the development of zeolite-based catalysts with excellent SCR activity by regulating the microscopic spatial distribution of framework Brønsted acid sites.
Collapse
Affiliation(s)
- Yu Fu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Wenqing Ding
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, China
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, China
| | - Huarong Lei
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
- Institute of Inorganic Chemistry, RWTH Aachen University, Aachen 52074, Germany
| | - Yu Sun
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jinpeng Du
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, 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
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ulrich Simon
- Institute of Inorganic Chemistry, RWTH Aachen University, Aachen 52074, Germany
| | - Peirong Chen
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Yulong Shan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, 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
| | - 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
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| |
Collapse
|
3
|
Dong X, Dai M, Yang T, Chen L, Yu H, Chen L, Zhao R, Jiang C. Mechanism of interaction between ascorbic acid and soil iron-containing minerals for peroxydisulfate activation and organophosphorus flame retardant degradation. ENVIRONMENTAL RESEARCH 2024; 244:117883. [PMID: 38072104 DOI: 10.1016/j.envres.2023.117883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 12/04/2023] [Accepted: 12/04/2023] [Indexed: 12/17/2023]
Abstract
Soil constituents may play an important role in peroxydisulfate (PDS)-based oxidation of organic contaminants in soil. Iron-containing minerals (Fe-minerals) have been found to promote PDS activation for organics degradation. Our study found that ascorbic acid (H2A) could enhance PDS activation by soil Fe-minerals for triphenyl phosphate (TPHP) degradation. Determination and characterization analyses of Fe fractions showed that H2A could induce the reductive dissolution of solid Fe-minerals and the increasing of oxygen vacancies/hydroxyl groups content on Fe-minerals surface. The increasing of divalent Fe (Fe(II)) accelerated PDS activation to generate reactive oxygen species (ROS). Electron paramagnetic resonance (EPR) and quenching studies showed that sulfate radicals (SO4•-) and hydroxyl radicals (HO•) contributed significantly to TPHP degradation. The composition and content of Fe-minerals and soil organic matter (SOM) markedly influenced ROS transformations. Surface-bond and structural Fe played the main role in the production of Fe(II) in reaction system. The high-concentration SOM could result in ROS consumption and degradation inhibition. Density functional theory (DFT) studies revealed that H2A is preferentially adsorbed at α-Fe2O3(012) surface through Fe-O-C bridges rather than hydrogen bonds. After absorption, H atoms on H2A may further be migrated to adjacent O atoms on the α-Fe2O3(012) surface. With the transformation of H atoms to the α-Fe2O3(012) surface, the Fe-O-C bridge is broken and one electron is transferred from the O to Fe atom, inducing the reduction of trivalent Fe (Fe(III)) atom. MS/MS2 analysis, HPLC analysis, and toxicity assessment demonstrated that TPHP was transformed to less toxic 4-hydroxyphenyl diphenyl phosphate (OH-TPHP), diphenyl hydrogen phosphate (DPHP), and phenyl phosphate (PHP) through phenol-cleavage and hydroxylation processes, and even be mineralized in reaction system.
Collapse
Affiliation(s)
- Xiaona Dong
- College of Environmental and Chemical Engineering, Jiangsu University of Science Technology, Zhenjiang, 212000, China
| | - Miaomiao Dai
- College of Environmental and Chemical Engineering, Jiangsu University of Science Technology, Zhenjiang, 212000, China
| | - Tongyi Yang
- College of Environmental and Chemical Engineering, Jiangsu University of Science Technology, Zhenjiang, 212000, China
| | - Lulu Chen
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Hongxia Yu
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Liwei Chen
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Rudong Zhao
- Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430070, China.
| | - Canlan Jiang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China.
| |
Collapse
|
4
|
Fu Y, Sun Y, Shan Y, Chen J, Du J, He G, He H. Unexpected Promotion Effect of H 2O on the Selective Catalytic Reduction of NO x with NH 3 over Cu-SSZ-39 Catalysts. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024. [PMID: 38314553 DOI: 10.1021/acs.est.3c07265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2024]
Abstract
Water molecules commonly inhibit the selective catalytic reduction (SCR) of NOx with NH3 on most catalysts, and water resistance is a long-standing challenge for SCR technology. Herein, by combining experimental measurements and density functional theory (DFT) calculations, we found that water molecules do not inhibit and even promote the NOx conversion to some extent over the Cu-SSZ-39 zeolites, a promising SCR catalyst. Water acting as a ligand on active Cu sites and as a reactant in the SCR reaction significantly improves the O2 activation performance and reduces the overall energy barrier of the catalytic cycle. This work unveils the mechanism of the unexpected promotion effect of water on the NH3-SCR reaction over Cu-SSZ-39 and provides fundamental insight into the development of zeolite-based SCR catalysts with excellent activity and water resistance.
Collapse
Affiliation(s)
- Yu Fu
- 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
| | - Yu Sun
- 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
| | - Yulong Shan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Junlin Chen
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, China
- University of Science and Technology of China, Hefei 230026, China
| | - Jinpeng Du
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, 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
| | - 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
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, China
- University of Science and Technology of China, Hefei 230026, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| |
Collapse
|
5
|
Luo J, Xu S, Xu H, Zhang Z, Chen X, Li M, Tie Y, Zhang H, Chen G, Jiang C. Overview of mechanisms of Fe-based catalysts for the selective catalytic reduction of NO x with NH 3 at low temperature. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:14424-14465. [PMID: 38291211 DOI: 10.1007/s11356-024-32113-7] [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: 11/01/2023] [Accepted: 01/17/2024] [Indexed: 02/01/2024]
Abstract
With the increasingly stringent control of NOx emissions, NH3-SCR, one of the most effective de-NOx technologies for removing NOx, has been widely employed to eliminate NOx from automobile exhaust and industrial production. Researchers have favored iron-based catalysts for their low cost, high activity, and excellent de-NOx performance. This paper takes a new perspective to review the research progress of iron-based catalysts. The influence of the chemical form of single iron-based catalysts on their performance was investigated. In the section on composite iron-based catalysts, detailed reviews were conducted on the effects of synergistic interactions between iron and other elements on catalytic performance. Regarding loaded iron-based catalysts, the catalytic performance of iron-based catalysts on different carriers was systematically examined. In the section on iron-based catalysts with novel structures, the effects of the morphology and crystallinity of nanomaterials on catalytic performance were analyzed. Additionally, the reaction mechanism and poisoning mechanism of iron-based catalysts were elucidated. In conclusion, the paper delved into the prospects and future directions of iron-based catalysts, aiming to provide ideas for the development of iron-based catalysts with better application prospects. The comprehensive review underscores the significance of iron-based catalysts in the realm of de-NOx technologies, shedding light on their diverse forms and applications. The hope is that this paper will serve as a valuable resource, guiding future endeavors in the development of advanced iron-based catalysts.
Collapse
Affiliation(s)
- Jianbin Luo
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Song Xu
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Hongxiang Xu
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Zhiqing Zhang
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China.
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China.
| | - Xiaofeng Chen
- Guangxi Automobile Group Co., Ltd, Liuzhou, 545007, China
| | - Mingsen Li
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Yuanhao Tie
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Haiguo Zhang
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Guiguang Chen
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Chunmei Jiang
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| |
Collapse
|
6
|
Zhu X, Yuan J, Peng Y, Chen J, Yuan X, Li J. In Situ S-Doping Engineering for Highly Efficient NH 3-SCR over Metal-Free Carbon Catalysts: A Novel Synergetic Promotional Mechanism. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:371-380. [PMID: 38146194 DOI: 10.1021/acs.est.3c07628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2023]
Abstract
Cyclic desulfurization-regeneration-denitrification based on metal-free carbon materials is one of the most promising ways to remove NOx and SO2 simultaneously. However, the impact of S-doping induced by the cyclic desulfurization and regeneration (C-S-R) process on the selective catalytic reduction (SCR) is not well understood. Herein, it is demonstrated that the C-S-R process at 500 °C induces in situ S-doping with a significant accumulation of C-S-C structures. NOx conversion was dramatically enhanced from 18.95% of the original sample to 84.55% of the S-doped sample. Density functional theory calculations revealed that the C-S-C structure significantly regulates the electronic structure of the C atom adjacent to the ketonic carbonyl group, thereby significantly altering the NH3 adsorption configuration with superior adsorption capacity. Moreover, S-doping induces an extra electron transfer between the N atom of the NH3 molecule and the C atom of the carbon plane, thereby promoting the activation of NH3 over the ketonic carbonyl group with a reduced energy barrier. This study elucidates a synergetic promotional mechanism between the ketonic carbonyl group and the C-S-C structure for SCR, offering a novel design strategy for high-performance heteroatom-doped carbon catalysts in industrial applications.
Collapse
Affiliation(s)
- Xiao Zhu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Jin Yuan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
- College of Resources and Environmental Engineering, Guizhou University, Guiyang, Guizhou 550025, P. R. China
| | - Yue Peng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Jianjun Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Xing Yuan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
| |
Collapse
|
7
|
Lei H, Chen D, Yang JY, Khetan A, Jiang J, Peng B, Simon U, Ye D, Chen P. Revealing the Formation and Reactivity of Cage-Confined Cu Pairs in Catalytic NO x Reduction over Cu-SSZ-13 Zeolites by In Situ UV-Vis Spectroscopy and Time-Dependent DFT Calculation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:12465-12475. [PMID: 37556316 DOI: 10.1021/acs.est.3c00458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
The low-temperature mechanism of chabazite-type small-pore Cu-SSZ-13 zeolite, a state-of-the-art catalyst for ammonia-assisted selective reduction (NH3-SCR) of toxic NOx pollutants from heavy-duty vehicles, remains a debate and needs to be clarified for further improvement of NH3-SCR performance. In this study, we established experimental protocols to follow the dynamic redox cycling (i.e., CuII ↔ CuI) of Cu sites in Cu-SSZ-13 during low-temperature NH3-SCR catalysis by in situ ultraviolet-visible spectroscopy and in situ infrared spectroscopy. Further integrating the in situ spectroscopic observations with time-dependent density functional theory calculations allows us to identify two cage-confined transient states, namely, the O2-bridged Cu dimers (i.e., μ-η2:η2-peroxodiamino dicopper) and the proximately paired, chemically nonbonded CuI(NH3)2 sites, and to confirm the CuI(NH3)2 pair as a precursor to the O2-bridged Cu dimer. Comparative transient experiments reveal a particularly high reactivity of the CuI(NH3)2 pairs for NO-to-N2 reduction at low temperatures. Our study demonstrates direct experimental evidence for the transient formation and high reactivity of proximately paired CuI sites under zeolite confinement and provides new insights into the monomeric-to-dimeric Cu transformation for completing the Cu redox cycle in low-temperature NH3-SCR catalysis over Cu-SSZ-13.
Collapse
Affiliation(s)
- Huarong Lei
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Dongdong Chen
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| | - Jia-Yue Yang
- Optics & Thermal Radiation Research Center, Shandong University, Qingdao 266237 China
| | - Abhishek Khetan
- Fuel Science Center, RWTH Aachen University, Schinkelstr. 8, 52074 Aachen, Germany
| | - Jiuxing Jiang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275 China
| | - Baoxiang Peng
- Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, Bochum 44780 Germany
| | - Ulrich Simon
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
- Fuel Science Center, RWTH Aachen University, Schinkelstr. 8, 52074 Aachen, Germany
| | - Daiqi Ye
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| | - Peirong Chen
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| |
Collapse
|
8
|
Gao M, Li Z, He G, Shan Y, Sun Y, He H. Unveiling the Origin of Selectivity in the Selective Catalytic Reduction of NO with NH 3 over Oxide Catalysts. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023. [PMID: 37216577 DOI: 10.1021/acs.est.3c01444] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The trade-off between activity and selectivity is a century-old puzzle in catalysis. In the selective catalytic reduction of NO with NH3 (NH3-SCR), various typical oxide catalysts exhibit distinct characteristics of activity and selectivity: Mn-based catalysts show outstanding low-temperature activity and poor N2 selectivity, mainly caused by N2O formation, while Fe- and V-based catalysts possess inverse characteristics. The underlying mechanism, however, has remained elusive. In this study, by combining experimental measurements and density functional theory calculations, we demonstrate that the distinct difference in the selectivity of oxide catalysts is determined by the gap in the energy barriers between N2 formation and N2O formation from the consumption of the key intermediate NH2NO. The gaps in the energy barriers follow the order of α-MnO2 < α-Fe2O3 < V2O5/TiO2, in correspondence with the order of N2 selectivity of the catalysts. This work discloses the intrinsic link between the target reaction and side reactions in the selective catalytic reduction of NO, providing fundamental insights into the origin of selectivity.
Collapse
Affiliation(s)
- Meng Gao
- 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
| | - Zhuocan Li
- 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
| | - Yulong Shan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yu Sun
- 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
| | - 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, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| |
Collapse
|
9
|
Ai W, Wang J, Wen J, Wang S, Tan W, Zhang Z, Liang K, Zhang R, Li W. Research landscape and hotspots of selective catalytic reduction (SCR) for NO x removal: insights from a comprehensive bibliometric analysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:65482-65499. [PMID: 37081369 DOI: 10.1007/s11356-023-26993-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 04/06/2023] [Indexed: 05/03/2023]
Abstract
Selective catalytic reduction (SCR) has been one of the most efficient and widely used technologies to remove nitrogen oxides (NOx). SCR research has developed rapidly in recent years, which can be reflected by the dramatic increase of related academic publications. Herein, based on the 10,627 documents from 2001 to 2020 in Web of Science, the global research landscape and hotspots in SCR are investigated based on a comprehensive bibliometric analysis. The results show that SCR research has developed positively; the annul number of articles increase sharply from 246 in 2001 to 1092 in 2020. People's Republic of China and Chinese Academy of Sciences are the most productive country and institution, respectively. The global collaboration is extensive and frequent, while People's Republic of China and USA have the most frequent research cooperation. Applied Catalysis B-Environmental is the leading publication source with 711 records. Five major research areas on SCR are identified and elaborated, including catalyst, reductant, deactivation, mechanism, and others. Zeolite is the most widely studied SCR catalyst, while copper, silver, platinum, and iron are the most popular metal elements in catalyst. Ammonia (NH3) is dominated among various SCR reductants, while hydrocarbon reductant has gained more attention. Sulfur dioxide (SO2) and vapor are the two most concerned factors leading to catalyst deactivation, and catalyst regeneration is also an important research topic. Density functional theory (DFT), in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and kinetics are the most widely used methods to conduct mechanism study. The studies on "low temperature," "atomic-scale insight," "elemental mercury," "situ DIRFTS investigation," "arsenic poisoning," "SPOA-34," "Cu-CHA catalyst," "TiO2 catalyst," and "Ce catalyst" have been the hotspots in recent years.
Collapse
Affiliation(s)
- Weikun Ai
- School of Ecology and Environment, Zhengzhou University, No. 100 Science Avenue, High-tech District, Zhengzhou, 450001, People's Republic of China
| | - Jiabin Wang
- School of Ecology and Environment, Zhengzhou University, No. 100 Science Avenue, High-tech District, Zhengzhou, 450001, People's Republic of China
| | - Junhui Wen
- School of Ecology and Environment, Zhengzhou University, No. 100 Science Avenue, High-tech District, Zhengzhou, 450001, People's Republic of China
| | - Shuai Wang
- School of Ecology and Environment, Zhengzhou University, No. 100 Science Avenue, High-tech District, Zhengzhou, 450001, People's Republic of China
| | - Wanting Tan
- School of Ecology and Environment, Zhengzhou University, No. 100 Science Avenue, High-tech District, Zhengzhou, 450001, People's Republic of China
| | - Zhenzong Zhang
- College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, People's Republic of China
| | - Ke Liang
- School of Ecology and Environment, Zhengzhou University, No. 100 Science Avenue, High-tech District, Zhengzhou, 450001, People's Republic of China
| | - Ruiqin Zhang
- School of Ecology and Environment, Zhengzhou University, No. 100 Science Avenue, High-tech District, Zhengzhou, 450001, People's Republic of China
- Henan Key Laboratory of Environmental Chemistry and Low Carbon Technology, Zhengzhou, 450001, People's Republic of China
| | - Wenjie Li
- School of Ecology and Environment, Zhengzhou University, No. 100 Science Avenue, High-tech District, Zhengzhou, 450001, People's Republic of China.
- Henan Key Laboratory of Environmental Chemistry and Low Carbon Technology, Zhengzhou, 450001, People's Republic of China.
| |
Collapse
|
10
|
Du Y, Wu X, Liu L, Li X, Liu L, Wu X. Low‐Temperature NH
3
Selective Catalytic Reduction Performance Enhancement of Fe‐Based Oxides by Employing Carbon Nanotubes to Decorate the MgFe‐LDH. ChemistrySelect 2023. [DOI: 10.1002/slct.202203767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Affiliation(s)
- Yali Du
- College of Chemistry and Chemical Engineering Jinzhong University Jinzhong 030619 China
| | - Xianfeng Wu
- College of Chemistry and Chemical Engineering Taiyuan University of Technology Taiyuan 030024 China (Xu Wu
| | - Lili Liu
- College of Chemistry and Chemical Engineering Taiyuan University of Technology Taiyuan 030024 China (Xu Wu
| | - Xiaodong Li
- College of Chemistry and Chemical Engineering Jinzhong University Jinzhong 030619 China
| | - Lifei Liu
- College of Chemistry and Chemical Engineering Taiyuan University of Technology Taiyuan 030024 China (Xu Wu
| | - Xu Wu
- College of Chemistry and Chemical Engineering Taiyuan University of Technology Taiyuan 030024 China (Xu Wu
- Shanxi Huadun Industrial Co. Ltd Taiyuan 030062 China
| |
Collapse
|
11
|
Liu K, Li J, Yu Q, Han X, Bian M, Zhang Y, Yi T. Optimization and comprehensive mechanism of environment-friendly bimetal oxides catalysts for efficient removal of NO in ultra-low temperature flue gas. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
|
12
|
Guo J, Gan F, Zhao Y, He J, Wang B, Gao T, Jiang X, Ma S. Revealing the crystal facet effect on N 2O formation during the NH 3-SCR over α-MnO 2 catalysts. RSC Adv 2023; 13:4032-4039. [PMID: 36756579 PMCID: PMC9890662 DOI: 10.1039/d2ra06744g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 01/16/2023] [Indexed: 01/29/2023] Open
Abstract
The detailed atomic-level mechanism of the effect induced by engineering the crystal facet of α-MnO2 catalysts on N2O formation during ammonia-selective catalytic reduction (NH3-SCR) was ascertained by combining density functional theory (DFT) calculations and thermodynamics/kinetic analysis. The surface energies of α-MnO2 with specific (100), (110), and (310) exposed planes were calculated, and the adsorptions of NH3, NO, and O2 on three surfaces were analyzed. The adsorption energies showed that NH3 and NO molecules could be strongly adsorbed on the surface of the α-MnO2 catalyst, while the adsorption of O2 was weak. Moreover, the key steps in the oxidative dehydrogenation of NH3 and the formation of NH2NO as well as dissociation of NH2 were studied to evaluate the catalytic ability of NH3-SCR reaction and N2 selectivity. The results revealed that the α-MnO2 catalyst exposed with the (310) plane exhibited the best NH3-SCR catalytic performance and highest N2 selectivity, mainly due to its low energy barriers in NH3 dehydrogenation and NH2NO generation, and difficulty in NH2 dissociation. This study deepens the comprehension of the facet-engineering of α-MnO2 on inhibiting N2O formation during the NH3-SCR, and points out a strategy to improve their catalytic ability and N2 selectivity for the low-temperature NH3-SCR process.
Collapse
Affiliation(s)
- Jundong Guo
- College of Architecture and Environment, Sichuan University Chengdu 610065 China
| | - Fengli Gan
- College of Architecture and Environment, Sichuan University Chengdu 610065 China
| | - Yifan Zhao
- College of Architecture and Environment, Sichuan University Chengdu 610065 China
| | - Jinglin He
- College of Architecture and Environment, Sichuan University Chengdu 610065 China
| | - Bangda Wang
- College of Architecture and Environment, Sichuan University Chengdu 610065 China .,College of Carbon Neutrality Future Technology, Sichuan University Chengdu 610065 China.,National Engineering Research Center for Flue Gas Desulfurization, Sichuan University Chengdu 610065 China
| | - Tao Gao
- Institute of Atomic and Molecular Physics, Sichuan UniversityChengdu 610065China
| | - Xia Jiang
- College of Architecture and Environment, Sichuan University Chengdu 610065 China .,College of Carbon Neutrality Future Technology, Sichuan University Chengdu 610065 China.,National Engineering Research Center for Flue Gas Desulfurization, Sichuan University Chengdu 610065 China
| | - Shenggui Ma
- College of Architecture and Environment, Sichuan University Chengdu 610065 China .,College of Carbon Neutrality Future Technology, Sichuan University Chengdu 610065 China.,National Engineering Research Center for Flue Gas Desulfurization, Sichuan University Chengdu 610065 China
| |
Collapse
|
13
|
Liu Y, Liu J, Zhu B, Chen J, Li F, Sun Y. Insight into the micro-mechanism of Co doping to improve the deNOx performance and H2O resistance of β-MnO2 catalysts. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.130983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
14
|
Yuan HY, Sun N, Chen J, Yang HG, Hu P, Wang H. Activity Self-Optimization Steered by Dynamically Evolved Fe 3+@Fe 2+ Double-Center on Fe 2O 3 Catalyst for NH 3-SCR. JACS AU 2022; 2:2352-2358. [PMID: 36311837 PMCID: PMC9597592 DOI: 10.1021/jacsau.2c00424] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 09/01/2022] [Accepted: 09/07/2022] [Indexed: 06/16/2023]
Abstract
Identification of the active centers dynamically stable under the reaction condition is of paramount importance but challenging because of the limited knowledge of steady-state chemistry on catalysts at the atomic level. Herein, focusing on the Fe2O3 catalyst for the selective catalytic reduction of NO with NH3 (NH3-SCR) as a model system, we reveal quantitatively the self-evolving Fe3+@Fe2+ (∼1:1) double-centers under the in-situ condition by the first-principles microkinetic simulations, which enables the accurate prediction of the optimal industry operating temperature (590 K). The cooperation of this double-center achieves the self-optimization of catalytic activity and rationalizes the intrinsic origin of Fe2O3 catalyzing NH3-SCR at middle-high temperatures instead of high temperatures. Our findings demonstrate the atomic-level self-evolution of active sites and the dynamically adjusted activity variation of the catalyst under the in-situ condition during the reaction process and provide insights into the reaction mechanism and catalyst optimization.
Collapse
Affiliation(s)
- Hai Yang Yuan
- Key
Laboratory for Advanced Materials and Joint International Research
Laboratory of Precision Chemistry and Molecular Engineering, Feringa
Nobel Prize Scientist Joint Research Center, Research Institute of
Industrial Catalysis and Centre for Computational Chemistry, School
of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China
- Key
Laboratory for Ultrafine Materials of Ministry of Education, Shanghai
Engineering Research Center of Hierarchical Nanomaterials, School
of Materials Science and Engineering, East
China University of Science and Technology, Shanghai 200237, China
| | - Ningning Sun
- Key
Laboratory for Advanced Materials and Joint International Research
Laboratory of Precision Chemistry and Molecular Engineering, Feringa
Nobel Prize Scientist Joint Research Center, Research Institute of
Industrial Catalysis and Centre for Computational Chemistry, School
of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Jianfu Chen
- Key
Laboratory for Advanced Materials and Joint International Research
Laboratory of Precision Chemistry and Molecular Engineering, Feringa
Nobel Prize Scientist Joint Research Center, Research Institute of
Industrial Catalysis and Centre for Computational Chemistry, School
of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Hua Gui Yang
- Key
Laboratory for Ultrafine Materials of Ministry of Education, Shanghai
Engineering Research Center of Hierarchical Nanomaterials, School
of Materials Science and Engineering, East
China University of Science and Technology, Shanghai 200237, China
| | - P. Hu
- Key
Laboratory for Advanced Materials and Joint International Research
Laboratory of Precision Chemistry and Molecular Engineering, Feringa
Nobel Prize Scientist Joint Research Center, Research Institute of
Industrial Catalysis and Centre for Computational Chemistry, School
of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China
- School
of Chemistry and Chemical Engineering, The
Queen’s University of Belfast, Belfast BT9, U.K.
| | - Haifeng Wang
- Key
Laboratory for Advanced Materials and Joint International Research
Laboratory of Precision Chemistry and Molecular Engineering, Feringa
Nobel Prize Scientist Joint Research Center, Research Institute of
Industrial Catalysis and Centre for Computational Chemistry, School
of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China
| |
Collapse
|
15
|
Zhang P, Wang P, Impeng S, Lan T, Liu X, Zhang D. Unique Compensation Effects of Heavy Metals and Phosphorus Copoisoning over NO x Reduction Catalysts. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:12553-12562. [PMID: 35960931 DOI: 10.1021/acs.est.2c02255] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Selective catalytic reduction (SCR) of NOx from the flue gas is still a grand challenge due to the easy deactivation of catalysts. The copoisoning mechanisms and multipoisoning-resistant strategies for SCR catalysts in the coexistence of heavy metals and phosphorus are barely explored. Herein, we unexpectedly found unique compensation effects of heavy metals and phosphorus copoisoning over NOx reduction catalysts and the introduction of heavy metals results in a dramatic recovery of NOx reduction activity for the P-poisoned CeO2/TiO2 catalysts. P preferentially combines with Ce as a phosphate species to reduce the redox capacity and inhibit NO adsorption. Heavy metals preferentially reduced the Brønsted acid sites of the catalyst and inhibited NH3 adsorption. It has been demonstrated that heavy metal phosphate species generated over the copoisoned catalyst, which boosted the activation of NH3 and NO, subsequently bringing about more active nitrate species to relieve the severe impact by phosphorus and maintain the NOx reduction over CeO2/TiO2 catalysts. The heavy metals and P copoisoned catalysts also possessed more acidic sites, redox sites, and surface adsorbed oxygen species, which thus contributed to the highly efficient NOx reduction. This work elaborates the unique compensation effects of heavy metals and phosphorus copoisoning over CeO2/TiO2 catalysts for NOx reduction and provides a perspective for further designing multipoisoning-resistant CeO2-based catalysts to efficiently control NOx emissions in stationary sources.
Collapse
Affiliation(s)
- Pan Zhang
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, No. 99 Shangda Road, Shanghai 200444, P. R. China
| | - Penglu Wang
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, No. 99 Shangda Road, Shanghai 200444, P. R. China
| | - Sarawoot Impeng
- National Nanotechnology Center, National Science and Technology Development Agency, Pathum Thani 12120, Thailand
| | - Tianwei Lan
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, No. 99 Shangda Road, Shanghai 200444, P. R. China
| | - Xiangyu Liu
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, No. 99 Shangda Road, Shanghai 200444, P. R. China
| | - Dengsong Zhang
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, No. 99 Shangda Road, Shanghai 200444, P. R. China
| |
Collapse
|
16
|
Jia L, Liu J, Huang D, Zhao J, Zhang J, Li K, Li Z, Zhu W, Zhao Z, Liu J. Interface Engineering of a Bifunctional Cu-SSZ-13@CZO Core–Shell Catalyst for Boosting Potassium Ion and SO 2 Tolerance. ACS Catal 2022. [DOI: 10.1021/acscatal.2c03048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lingfeng Jia
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, P. R. China
| | - Jixing Liu
- School of Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang 212013, P. R. China
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd., Tianjin 300300, P. R. China
| | - Deqi Huang
- College of Chemical Engineering, Yangzhou Polytechnic Institute, Yangzhou 225127, P. R. China
| | - Jingchen Zhao
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, P. R. China
| | - Jianning Zhang
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, P. R. China
| | - Kaixiang Li
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd., Tianjin 300300, P. R. China
| | - Zhenguo Li
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd., Tianjin 300300, P. R. China
| | - Wenshuai Zhu
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, P. R. China
- School of Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang 212013, P. R. China
| | - Zhen Zhao
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, P. R. China
| | - Jian Liu
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, P. R. China
| |
Collapse
|
17
|
Catalytic performance of calcined Fe2O3/CA catalyst for NH3-SCR reaction: Role of activation temperature. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
18
|
Fu Y, He G, Shan Y, Du J, He H. Promotion of the selective catalytic reduction of NOx with NH3 over microporous Cu-SSZ-13 by H2O and OH group at low temperatures: a density functional theory study. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00796g] [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
The successful commercialization of microporous Cu-SSZ-13 catalysts in the selective catalytic reduction (SCR) of NOx with NH3 has attracted extensive attention and debate on the mechanism of their excellent activity...
Collapse
|
19
|
Xu Q, Li Z, Wang L, Zhan W, Guo Y, Guo Y. Understand the role of redox property and NO adsorption over MnFeOx for NH3-SCR. Catal Sci Technol 2022. [DOI: 10.1039/d1cy02203b] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Widening the operation temperature window of selective catalytic reduction NO by NH3 (NH3-SCR) is a challenge to meet the increasingly stringent emission control regulations of NOx. Hence, MnFeOx with different...
Collapse
|
20
|
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....
Collapse
|
21
|
Xie C, Zhu B, Sun Y, Li F, Song W. Understanding the roles of copper dopant and oxygen vacancy in promoting nitrogen oxides removal over iron-based catalyst surface: A collaborative experimental and first-principles study. J Colloid Interface Sci 2021; 612:584-597. [PMID: 35016019 DOI: 10.1016/j.jcis.2021.12.102] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 12/07/2021] [Accepted: 12/16/2021] [Indexed: 10/19/2022]
Abstract
In this work, we proposed a novel strategy of copper (Cu) doping to enhance the nitrogen oxides (NOx) removal efficiency of iron (Fe)-based catalysts at low temperature through a simple citric acid mixing method, which is critical for its practical application. The doping of Cu significantly improves the deNOx performance of Fe-based catalysts below 200 °C, and the optimal catalyst is (Cu0.22Fe1.78)1-δO3, which deNOx efficiency can reach 100% at 160-240 °C. From the macro aspects, the main reasons for the excellent catalytic activity of the (Cu0.22Fe1.78)1-δO3 catalyst are the large number of oxygen vacancies (Ovac), appropriate Fe3+ and Cu2+ contents, stronger surface acidity and redox ability. From the micro aspects, the Ovac plays a key role in enhancing molecular adsorption, oxidation, and the deNOx reaction over the Fe-based catalyst surface, which promoting order is CuOvac > Ovac > Cu. This work provides a new insight for the mechanism study of oxygen vacancy engineering and also accelerates the development of CuFe bimetal composite catalysts at low temperature.
Collapse
Affiliation(s)
- Chaoyue Xie
- School of Petroleum Engineering, Changzhou University, Changzhou, Jiangsu 213164, China
| | - Baozhong Zhu
- School of Petroleum Engineering, Changzhou University, Changzhou, Jiangsu 213164, China.
| | - Yunlan Sun
- School of Petroleum Engineering, Changzhou University, Changzhou, Jiangsu 213164, China.
| | - Fan Li
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangdong, Guangzhou 510640, China
| | - Weiyi Song
- School of Petroleum Engineering, Changzhou University, Changzhou, Jiangsu 213164, China
| |
Collapse
|