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Li J, Zhang C, Fang D, Zheng Z, Zhao Y, Tan P, Fang Q, Chen G. The inhibition mechanism of N 2O generation in NH 3-SCR process by water vapor. JOURNAL OF HAZARDOUS MATERIALS 2025; 485:136881. [PMID: 39706019 DOI: 10.1016/j.jhazmat.2024.136881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2024] [Revised: 12/11/2024] [Accepted: 12/12/2024] [Indexed: 12/23/2024]
Abstract
N₂O is a typical by-product in the NH3-SCR process, which requires urgent resolution due to its negative economic and environmental impacts. This study investigates in detail the mechanism of N2O generation on the surface of the Mn-Ce/TiO2 catalyst (Mn-Ce/TiO2-ZS) with anatase {001} facets preferentially exposed. The deep oxidation of NH3 and *NH2 capture of NO via O2 were proved to be the dominant N2O generation pathways. The production of N2O was remarkably reduced by the introduction of a low percentage of water vapor (H2O). The results revealed that low percentage of H2O was capable of enhancing the acid sites on the catalyst surface and facilitating the generation of active hydroxyl species. These active species inhibited the deep dehydrogenation of ammonia and the disintegration of nitrate species on the catalyst surface, as well as suppressing the generation of N2O.
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Affiliation(s)
- Junchen Li
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Cheng Zhang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
| | - Dingli Fang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Zhao Zheng
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Yan Zhao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Peng Tan
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Qingyan Fang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Gang Chen
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
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Song K, Guo K, Mao S, Ma D, Lv Y, He C, Wang H, Cheng Y, Shi JW. Insight into the Origin of Excellent SO 2 Tolerance and de-NO x Performance of quasi-Mn-BTC in the Low-Temperature Catalytic Reduction of Nitrogen Oxide. ACS Catal 2023. [DOI: 10.1021/acscatal.3c00106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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Gao C, Yang G, Huang X, Yang Q, Li B, Wang D, Peng Y, Li J, Lu C, Crittenden J. Key intermediates from simultaneous removal of NO x and chlorobenzene over a V 2O 5–WO 3/TiO 2 catalyst: a combined experimental and DFT study. Catal Sci Technol 2021. [DOI: 10.1039/d1cy01210j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Chlorobenzene suppresses the active cis-N2O22− formation and the dissociated Cl− combines with vanadium to form vanadium chloride which enhanced surface Brønsted acidity.
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Affiliation(s)
- Chuan Gao
- School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, China
| | - Guangpeng Yang
- Brook Byers Institute for Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, 828 West Peachtree Street, Atlanta, GA, 30332, USA
| | - Xu Huang
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Qilei Yang
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Bing Li
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Dong Wang
- School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, China
- Brook Byers Institute for Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, 828 West Peachtree Street, Atlanta, GA, 30332, USA
| | - Yue Peng
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Junhua Li
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Chunmei Lu
- School of Energy and Power Engineering, Shandong University, Jinan, Shandong, 250061, China
| | - John Crittenden
- Brook Byers Institute for Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, 828 West Peachtree Street, Atlanta, GA, 30332, USA
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