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Liu H, Wang Y, Xu W, Yang Y, Yang J, Li C, Zhu T. Unraveling the Synergistic Mechanism of Ir Species with Various Electron Densities over an Ir/ZSM-5 Catalyst Enables High-Efficiency NO Reduction by CO. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:12082-12090. [PMID: 38888120 DOI: 10.1021/acs.est.4c02346] [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: 06/20/2024]
Abstract
Selective catalytic reduction using CO as a reducing agent (CO-SCR) has exhibited its application potential in coal-fired, steel, and other industrial sectors. In comparison to NH3-SCR, CO-SCR can achieve synergistic control of CO and NO pollutants, making it a powerful denitrification technology that treats waste with waste. Unfortunately, the competitive adsorption of O2 and NO on CO-SCR catalysts inhibits efficient conversion of NOx under O2-containing conditions. In this work, we obtained two Ir sites with different electron densities, Ir1 single atoms in the oxidized Irδ+ state and Ir0 nanoparticles in the metallic state, by controlled pretreatment of the Ir/ZSM-5 catalyst with H2 at 200 °C. The coexistence of Ir1 single atoms and Ir0 nanoparticles on ZSM-5 creates a synergistic effect, which facilitates the reduction of NO through CO in the presence of O2, following the Langmuir-Hinshelwood mechanism. The ONNO dimer is formed on the Ir1 single atom sites and then spills over to the neighboring Ir0 nanoparticles for subsequent reduction to N2 by CO. Specifically, this tandem reaction enables 83% NO conversion and 100% CO conversion on an Ir-based catalyst at 250 °C under 3% O2.
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Affiliation(s)
- Huixian Liu
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Yixi Wang
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Wenqing Xu
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, People's Republic of China
| | - Yang Yang
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Jun Yang
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Chaoqun Li
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Tingyu Zhu
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, People's Republic of China
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Wang Y, Xu W, Liu H, Chen W, Zhu T. Catalytic removal of gaseous pollutant NO using CO: Catalyst structure and reaction mechanism. ENVIRONMENTAL RESEARCH 2024; 246:118037. [PMID: 38160964 DOI: 10.1016/j.envres.2023.118037] [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: 10/24/2023] [Revised: 12/07/2023] [Accepted: 12/22/2023] [Indexed: 01/03/2024]
Abstract
Carbon monoxide (CO) has recently been considered an ideal reducing agent to replace NH3 in selective catalytic reduction of NOx (NH3-SCR). This shift is particularly relevant in diesel engines, coal-fired industry, the iron and steel industry, of which generate substantial amounts of CO due to incomplete combustion. Developing high-performance catalysts remain a critical challenge for commercializing this technology. The active sites on catalyst surface play a crucial role in the various microscopic reaction steps of this reaction. This work provides a comprehensive overview and insights into the reaction mechanism of active sites on transition metal- and noble metal-based catalysts, including the types of intermediates and active sites, as well as the conversion mechanism of active molecules or atoms. In addition, the effects of factors such as O2, SO2, and alkali metals, on NO reduction by CO were discussed, and the prospects for catalyst design are proposed. It is hoped to provide theoretical guidance for the rational design of efficient CO selective catalytic denitration materials based on the structure-activity relations.
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Affiliation(s)
- Yixi Wang
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China
| | - Wenqing Xu
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China.
| | - Huixian Liu
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Wanrong Chen
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Tingyu Zhu
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China.
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Catalytic Reduction of N2O by CO on Single-Atom Catalysts Au/C2N and Cu/C2N: A First-Principles Study. Catalysts 2023. [DOI: 10.3390/catal13030578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/15/2023] Open
Abstract
The catalytic conversion of greenhouse gases, such as N2O, is a promising way to mitigate global warming. In this work, density functional theory (DFT) studies were performed to study N2O reduction by CO over single-atom catalysts (SACs) and compare the performance of noble (Au/C2N) and non-noble (Cu/C2N) SACs. The computational results indicated that catalytic N2O reduction on both catalysts occurs via two mechanisms: (I) the N2O adsorption mechanism—starting from the adsorption on the catalysts, N2O decomposes to a N2 molecule and O-M/C2N intermediate, and then CO reacts with O atom on the O-M/C2N intermediate to form CO2; and (II) the CO adsorption mechanism—CO and N2O are adsorbed on the catalyst successively, and then a synergistic reaction occurs to produce N2 and CO2 directly. The computational results show that mechanism I exhibits an obvious superiority over mechanism II for both catalysts due to the lower activation enthalpy. The activation enthalpies of the rate-determining step in mechanism I are 1.10 and 1.26 eV on Au/C2N and Cu/C2N, respectively. These results imply that Cu/C2N, an abundant-earth SAC, can be as active as expensive Au/C2N. Herein, our research provides a theoretical foundation for the catalytic reduction of N2O and broadens the application of non-noble-metal SACs.
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Zhang Q, He C, Huo J. Epoxidation of O2 and C3H6 on M1/PTA Single-Atom Catalyst: Theory and Calculation Simulations. Catal Letters 2023. [DOI: 10.1007/s10562-023-04290-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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Lin CH, Qin RC, Cao N, Wang D, Liu CG. Synergistic Effects of Keggin-Type Phosphotungstic Acid-Supported Single-Atom Catalysts in a Fast NH 3-SCR Reaction. Inorg Chem 2022; 61:19156-19171. [DOI: 10.1021/acs.inorgchem.2c02759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- Chun-Hong Lin
- Department of Chemistry, Faculty of Science, Beihua University, Jilin City132013, P. R. China
- Special Ammunition Research Institute, North Huaan Industry Group Co., Ltd., Qiqihar161046, P. R. China
- College of Chemical Engineering, Northeast Electric Power University, Jilin City132012, P. R. China
| | - Rui-Cheng Qin
- Department of Chemistry, Faculty of Science, Beihua University, Jilin City132013, P. R. China
| | - Ning Cao
- College of Chemical Engineering, Northeast Electric Power University, Jilin City132012, P. R. China
| | - Dan Wang
- Department of Chemistry, Faculty of Science, Beihua University, Jilin City132013, P. R. China
| | - Chun-Guang Liu
- Department of Chemistry, Faculty of Science, Beihua University, Jilin City132013, P. R. China
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Chen L, Zhang J, Wang J, Chen P, Fu M, Wu J, Ye D. Insight into the Improvement Effect of Nitrogen Dopant in Ag/Co 3O 4 Nanocubes for Soot Oxidation: Experimental and Theoretical Studies. JOURNAL OF HAZARDOUS MATERIALS 2021; 420:126604. [PMID: 34271450 DOI: 10.1016/j.jhazmat.2021.126604] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 07/06/2021] [Accepted: 07/06/2021] [Indexed: 06/13/2023]
Abstract
Different doping amounts of N-doped Ag/Co3O4 nanocubes were synthesized for the first time for catalytic soot oxidation. The N-doped sample exhibited remarkably improved catalytic activity, of which the maximum decrease in temperature for 90% soot conversion was almost 40 ℃. Characterization results analyzed by TEM, XPS, EPR, H2-TPR, O2-TPD, etc. revealed that the incorporation of N atoms can alter the electronic structure, leading to the generation of more oxygen vacancies and enhancement of lattice oxygen mobility. Meanwhile, larger surface area, rugged morphology and promoted reducibility also contribute to the performance improvement. DFT calculations on the differential charge density, Gibbs free energy, etc. were performed to investigate the intrinsic reasons on an atomic level. Due to the relatively higher electronegativity, N dopant could be an electron-appealing center to promote efficient electron transfer, resulting in the redistribution of charge density and formation of conductive Co-N bonds. This variation in electronic structure favors lowering the formation energy of oxygen vacancies and facilitating the activation of the lattice oxygen originated from the highly hybridized Co-O bonds, which ultimately reduces the activation barriers for reactants/intermediates and accelerates the reaction kinetics. This study evidenced that N doping could be an effective strategy to promote catalytic soot oxidation.
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Affiliation(s)
- Longwen Chen
- School of Environment and Energy, South China University of Technology, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), Guangzhou 510640, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment (SCUT), Guangzhou 510640, China.
| | - Jun Zhang
- School of Environment and Energy, South China University of Technology, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), Guangzhou 510640, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment (SCUT), Guangzhou 510640, China
| | - Jing Wang
- School of Environment and Energy, South China University of Technology, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), Guangzhou 510640, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment (SCUT), Guangzhou 510640, China
| | - Peirong Chen
- School of Environment and Energy, South China University of Technology, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), Guangzhou 510640, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment (SCUT), Guangzhou 510640, China
| | - Mingli Fu
- School of Environment and Energy, South China University of Technology, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), Guangzhou 510640, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment (SCUT), Guangzhou 510640, China
| | - Junliang Wu
- School of Environment and Energy, South China University of Technology, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), Guangzhou 510640, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment (SCUT), Guangzhou 510640, China
| | - Daiqi Ye
- School of Environment and Energy, South China University of Technology, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), Guangzhou 510640, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment (SCUT), Guangzhou 510640, China.
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Xing Y, Guo Z, Su W, Wen W, Wang X, Zhang H. A review of the hot spot analysis and the research status of single-atom catalysis based on the bibliometric analysis. NEW J CHEM 2021. [DOI: 10.1039/d0nj05673a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The bibliometric method was used to analyze the development trend and research hotspots in past 10 years since the concept of single-atom catalysis was proposed in 2011. This article can provide some guidance for future research of SACs.
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Affiliation(s)
- 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
| | - Zefeng Guo
- School of Energy and Environmental Engineering
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Wei Su
- School of Energy and Environmental Engineering
- University of Science and Technology Beijing
- Beijing 100083
- China
- Key Laboratory of Knowledge Automation for Industrial Processes
| | - Wei Wen
- School of Energy and Environmental Engineering
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Xiaona Wang
- School of Energy and Environmental Engineering
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Hui Zhang
- School of Energy and Environmental Engineering
- University of Science and Technology Beijing
- Beijing 100083
- China
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