Influence of CeO_2 loading on structure and catalytic activity for NH_3-SCR over TiO_2-supported CeO_2 |
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| Affiliation: | 1. School of Metallurgical Engineering, Anhui University of Technology, Ma''anshan 243032, China;2. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Anhui University of Technology), Ministry of Education, Ma''anshan 243002, China;3. Analysis and Testing Central Facility, Anhui University of Technology, Ma''anshan 243002, China;4. Jiangsu Key Laboratory of Vehicle Emissions Control, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China;1. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China;2. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;1. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, PR China;2. School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng, 224051, PR China;3. Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng, 224051, PR China;1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;2. Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou 621908, Sichuan, China;3. University of Chinese Academy of Sciences, Beijing 100049, 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. National Engineering Research Center for Flue Gas Desulfurization, Department of Environmental Science and Engineering, Sichuan University, Chengdu 610065, PR China;3. Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, School of the Environment, Nanjing University, Nanjing 210093, PR China |
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| Abstract: | A series of supported CeO_2/TiO_2 catalysts were prepared to explore the influence of CeO_2 loading on these catalysts for the selective catalytic reduction of NO_3 by NH_3(NH_3-SCR).The catalysts were investigated in detail by means of XRD,Raman,H_2-TPR,NH_3-TPD,XPS,in situ DRIFTS,and NH3-SCR reaction.The activity of the catalyst is closely related to the content of CeO_2.When the loading of CeO_2 is near the dispersion capacity(1.16 mmol Ce~(4+)/100 m~2 TiO_2),the catalytic activity is better.This may be because that the dispersed CeO_2 is the active species and the catalyst has appropriate redox property,along with the larger amounts of surface Ce content and surface adsorbed oxygen species.Finally,a possible reaction mechanism via the Langmuir-Hinshelwood(L-H) mechanism is tentatively proposed to further understand the NH_3-SCR reaction. |
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| Keywords: | Selective catalytic reduction Redox property Dispersion capacity Structure–activity relationship Rare earths |
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