Selective reduction of NO by NH3 over Fe-zeolite-promoted V2O5-WO3/TiO2-based catalysts: Great suppression of N2O formation and origin of NO removal activity loss |
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| Affiliation: | 1. Key Laboratory for Energy Thermal Conversion and Control, Ministry of Education, Southeast University, Nanjing 210096, China;2. School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China;1. School of Petrochemical Engineering, Changzhou University, Changzhou 213164, PR China;2. Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou 213164, PR China;1. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China;2. Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA;3. Zhejiang Tianlan Environmental Protection Technology Co., LTD, PR China;1. Competence Centre for Catalysis, Chemical Engineering, Chalmers University of Technology, Gothenburg, SE 412 96, Sweden;2. Cummins Inc., 1900 McKinley Avenue, MC 50183, Columbus, IN 47201, USA |
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| Abstract: | Great depression of the formation N2O in the selective catalytic reduction of NO by NH3 (NH3-SCR) has been studied by combining a V2O5-WO3/TiO2 (VWT) catalyst with a Fe-exchanged ZSM-5 zeolite (FeZ). At temperatures > 400 °C, N2O formation was significant over VWT but < 5 ppm over FeZ/VWT catalysts with the FeZ ≥ 8%. Unfortunately, all these FeZ-promoted catalysts disclosed a decrease in deNOxing performances, due to an enhanced NH3 oxidation into NO. At temperatures > 350 °C, the chemically-combined VWT-based FeZ systems could facilitate both N2O reduction with NH3 and N2O decomposition, thereby suppressing N2O emissions in NH3-SCR reaction. |
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