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Influence of CeO2 loading on structure and catalytic activity for NH3-SCR over TiO2-supported CeO2

查看全文 作　　者：Hongliang [1,2,3]Zhang;Long [1]Ding;Hongming [1,2]Long;Jiaxin [1,2]Li;Wei [4]Tan;Jiawei [1,2]Ji;Jingfang [4]Sun;Changjin [4]Tang;Lin [4]Dong 高影响力作者 机构地区：[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高影响力机构 出　　处：《Journal of Rare Earths》索引2020年第38卷第8期,共9页高影响力期刊 基　　金：Project supported by the National Natural Science Foundation of China(21773106,21677069,51674002,21307001);the Open Project Program of Jiangsu Key Laboratory of Vehicle Emissions Control(OVEC037)。 摘　　要：A series of supported CeO2/TiO2 catalysts were prepared to explore the influence of CeO2 loading on these catalysts for the selective catalytic reduction of NO3 by NH3(NH3-SCR).The catalysts were investigated in detail by means of XRD,Raman,H2-TPR,NH3-TPD,XPS,in situ DRIFTS,and NH3-SCR reaction.The activity of the catalyst is closely related to the content of CeO2.When the loading of CeO2 is near the dispersion capacity(1.16 mmol Ce4+/100 m^2 TiO2),the catalytic activity is better.This may be because that the dispersed CeO2 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 NH3-SCR reaction. 关 键 词：CEO2 Selective catalytic reduction Redox property Dispersion capacity Structure-activity relationship Rare earths
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