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Decomposition of Heavy Diesel SCR Urea Fluid Adsorbed in Cu/HZSM-5 SCR Catalysts Studied by FTIR Spectroscopy at Ambient Conditions. REACTIONS 2022. [DOI: 10.3390/reactions3040038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A method is presented to study the decomposition of urea deposited on Cu/HZSM-5 SCR catalysts and therewith the ability of the Cu/HZSM-5 SCR catalyst to be regenerated when being overdosed with SCR urea fluids during operation. This straightforward laboratory method could speed up calibration of exhaust gas aftertreatment systems. As an example, the removal of adsorbed urea to the SCR substrate due to dosage malfunction is studied. To study the removal of adsorbed urea on the catalyst substrate, FTIR experiments have been conducted to investigate the state of the catalyst. Besides Cu/HZSM-5 also HZSM-5 and CuOx were studied as model compounds to provide more inside on the processes occurring at the Cu/HZSM-5 surface upon urea decomposition. To simulate exposure of the SCR catalyst to overdosing of the urea solution, samples were impregnated with a 32 wt% urea solution, which correlates to that of commercial heavy duty diesel urea solutions. After impregnation, the samples were heated at various temperatures in the 133–400 °C temperature region, typically the operation window of a SCR catalyst. After heating, the samples were cooled to room temperature and measured in FTIR. The obtained spectra were compared with various literature reports to correlate the observed absorption bands to urea, urea related compounds and decomposition compounds. The concentration of these adsorbed species decreases at increased thermolysis temperature and is no longer visible at temperatures >250 °C. Extended heat treatment at 200 °C revealed only minor loss of adsorbents after 6 h and were still observable in the FTIR spectra after 24 h. Urea derived adsorbents were completely removed when simulating catalyst regeneration under SCR operation conditions under continuous air flow with a humidity of 10% and at elevated temperatures (400 °C).
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Marimuthu G, Bharathi G, Palanisamy G, Albaqami MD, Karami AM, Mani G, Pazhanivel T. Pyramid-shaped MMn2O4/rGO (M = Ni, Co) nanocomposites and their application in ammonia sensors. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-022-02560-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Xu X, Li G, Zhang F, Jiang G, Hao Z. High temperature H2S selective oxidation on a copper-substituted hexaaluminate catalyst: A facile process for treating low concentration acid gas. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.07.053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Yu Y, Geng M, Wei D, He C. Promoting the effects of CuSO 4 on N 2 selectivity in selective catalytic oxidation of ammonia over Pt/TiO 2 catalysts. NEW J CHEM 2022. [DOI: 10.1039/d2nj04037a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The NH3-SCO reaction mechanism over a Pt/TiO2 catalyst was transferred into the i-SCR mechanism after adding CuSO4, and thus the formation of N2 was promoted.
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Affiliation(s)
- Yanke Yu
- Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P. R. China
| | - Mengqiao Geng
- Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P. R. China
| | - Desheng Wei
- Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P. R. China
| | - Chi He
- Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P. R. China
- National Engineering Laboratory for VOCs Pollution Control Material & Technology, University of Chinese Academy of Sciences, Beijing 101408, P. R. China
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Wang Z, Li S, Zhang C, Wang D, Li X. The Opportunities and Challenges for NH3 Oxidation with 100% Conversion and Selectivity. CATALYSIS SURVEYS FROM ASIA 2021. [DOI: 10.1007/s10563-020-09320-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Wang C, Xuan J, Zhang L, Liu Z, Cui Q, Wang H. Low Temperature Adsorption Desulfurization Performance and Mechanism of CeFe/ZSM‐5 for H
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S and SO
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Mixture. ChemistrySelect 2020. [DOI: 10.1002/slct.202003414] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Chenyang Wang
- College of Chemical Engineering Nanjing Tech University Nanjing Jiangsu 210009 P. R. China
| | - Jianyu Xuan
- College of Chemical Engineering Nanjing Tech University Nanjing Jiangsu 210009 P. R. China
| | - Lin Zhang
- College of Chemical Engineering Nanjing Tech University Nanjing Jiangsu 210009 P. R. China
| | - Zongjian Liu
- College of Chemical Engineering Nanjing Tech University Nanjing Jiangsu 210009 P. R. China
- Research Institute of Sinopec Yangzi Petrochemical Nanjing Jiangsu 210048 P. R. China
| | - Qun Cui
- College of Chemical Engineering Nanjing Tech University Nanjing Jiangsu 210009 P. R. China
| | - Haiyan Wang
- College of Chemical Engineering Nanjing Tech University Nanjing Jiangsu 210009 P. R. China
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