Doping effect of rare earth metal ions Sm3+, Nd3+ and Ce4+ on denitration performance of MnOx catalyst in low temperature NH3-SCR reaction |
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| Affiliation: | 1. Research Center for Atmospheric Environment, Key Laboratory of Reservoir Aquatic Environment of CAS, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;2. College of Resources and Environment, Chongqing School, University of Chinese Academy of Sciences (UCAS Chongqing), Chongqing 400714, China;3. Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China;1. College of Architecture and Environment, Sichuan University, Chengdu 610065, China;2. National Engineering Research Center for Flue Gas Desulfurization, Chengdu 610065, China;3. Institute of New Energy and Low Carbon Technology, Sichuan University, Chengdu 610065, Sichuan, China;1. Research Center for Atmospheric Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, PR China;2. School of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400045, PR China;3. National Engineering Research Center for Flue Gas Desulfurization, School of Architecture and Environment, Sichuan University, Chengdu 610065, PR China;4. Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing 210093, PR China;1. School of Energy Science and Engineering, Nanjing Tech University, Nanjing 211816, PR China;2. Guodian Environmental Protection Research Institute Co., Ltd., Nanjing 210031, PR China;3. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, PR China;4. State Key Laboratory of Bio-fibers and Eco-textiles, College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, PR China;1. Research Center for Atmospheric Environment, Key Laboratory of Reservoir Aquatic Environment of CAS, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, PR China;2. College of Resources and Environment, Chongqing School, University of Chinese Academy of Sciences (UCAS Chongqing), Chongqing 400714, PR China;3. School of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, PR China;4. CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China |
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| Abstract: | The MnXOx catalysts (i.e., MnSmOx, MnNdOx, MnCeOx) were prepared by reverse co-precipitation method and used for NH3-SCR reaction. It is found that MnCeOx catalyst presents the best low temperature catalytic activity (higher than 90% NOx conversion in the temperature range from 125 to 225 °C) and excellent H2O + SO2 resistance. In order to explore the reason for this result, the characterization of X-ray diffraction (XRD), Raman spectroscopy, Brunauer–Emmett–Teller (BET), H2-temperature programmed reduction (H2-TPR), NH3-temperature programmed desorption (NH3-TPD), X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflaxions infrared Fourier transformations spectroscopy (DRIFTS) were conducted. The obtained results suggest that MnCeOx catalyst shows the largest amount of acid sites and the best reducibility among these MnXOx catalysts. Besides, Ce4+ doping inhibits the crystallization of MnOx catalyst and shows the largest specific surface area. Finally, in situ DRIFTS experiments reveal that NH3-SCR reaction over MnCeOx catalyst follows both Langmuir–Hinshelwood (L-H) and Eley-Rideal (E-R) mechanisms, which is through “fast SCR” reaction. |
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| Keywords: | Low temperature Rare earth Doping effect |
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