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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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In situ IR spectroscopy study of NO removal over CuCe catalyst for CO-SCR reaction at different temperature. Catal Today 2023. [DOI: 10.1016/j.cattod.2023.114082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
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Li N, Zhang T, Wu Z, Li J, Wang W, Zhu J, Yao S, Gao E. Rationally tailored redox ability of Sn/γ-Al 2O 3 with Ag for enhancing the selective catalytic reduction of NO x with propene. RSC Adv 2023; 13:1738-1750. [PMID: 36712644 PMCID: PMC9832442 DOI: 10.1039/d2ra07316a] [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: 11/17/2022] [Accepted: 12/23/2022] [Indexed: 01/12/2023] Open
Abstract
The development of excellent selective catalytic reduction (SCR) catalysts with hydrocarbons for lean-burn diesel engines is of great significance, and a range of novel catalysts loaded with Sn and Ag were studied in this work. It was found that the synergistic effects of Sn and Ag enabled the 1Sn5Ag/γ-Al2O3 (1 wt% Sn and 5wt% Ag) to exhibit superior C3H6-SCR performance. The de-NO x efficiency was maintained above 80% between 336 and 448 °C. The characterization results showed that the presence of AgCl crystallites in the 1Sn5Ag/γ-Al2O3 catalyst helped its redox ability maintain an appropriate level, which suppressed the over-oxidation of C3H6. Besides, the number of surface adsorbed oxygen (Oα) and hydroxyl groups (Oγ) were enriched, and their reactivity was greatly enhanced due to the coexistence of Ag and Sn. The ratio of Ag0/Ag+ was increased to 3.68 due to the electron transfer effects, much higher than that of Ag/γ-Al2O3 (2.15). Lewis acid sites dominated the C3H6-SCR reaction over the 1Sn5Ag/γ-Al2O3 catalyst. The synergistic effects of Sn and Ag facilitated the formation of intermediates such as acetates, enolic species, and nitrates, and inhibited the deep oxidation of C3H6 into CO2, and the C3H6-SCR mechanism was carefully proposed.
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Affiliation(s)
- Ning Li
- School of Petrochemical Engineering, Changzhou UniversityJiangsu213164China
| | - Tiantian Zhang
- School of Environmental Science and Engineering, Changzhou UniversityJiangsu213164China
| | - Zuliang Wu
- School of Environmental Science and Engineering, Changzhou UniversityJiangsu213164China,Advanced Plasma Catalysis Engineering Laboratory for China Petrochemical Industry, Changzhou UniversityJiangsu213164China
| | - Jing Li
- School of Environmental Science and Engineering, Changzhou UniversityJiangsu213164China,Advanced Plasma Catalysis Engineering Laboratory for China Petrochemical Industry, Changzhou UniversityJiangsu213164China
| | - Wei Wang
- School of Environmental Science and Engineering, Changzhou UniversityJiangsu213164China,Advanced Plasma Catalysis Engineering Laboratory for China Petrochemical Industry, Changzhou UniversityJiangsu213164China
| | - Jiali Zhu
- School of Environmental Science and Engineering, Changzhou UniversityJiangsu213164China,Advanced Plasma Catalysis Engineering Laboratory for China Petrochemical Industry, Changzhou UniversityJiangsu213164China
| | - Shuiliang Yao
- School of Environmental Science and Engineering, Changzhou UniversityJiangsu213164China,Advanced Plasma Catalysis Engineering Laboratory for China Petrochemical Industry, Changzhou UniversityJiangsu213164China
| | - Erhao Gao
- School of Environmental Science and Engineering, Changzhou UniversityJiangsu213164China,Advanced Plasma Catalysis Engineering Laboratory for China Petrochemical Industry, Changzhou UniversityJiangsu213164China
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