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

作者：Hongliang Zhang,Long Ding,Hongming Long,Jiaxin Li,Wei Tan,Jiawei Ji,Jingfang Sun,Changjin Tang,Lin Dong

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.

发文机构：School of Metallurgical Engineering Key Laboratory of Metallurgical Emission Reduction&Resources Recycling（Anhui University of Technology） Analysis and Testing Central Facility Jiangsu Key Laboratory of Vehicle Emissions Control

关键词：CEO2SelectivecatalyticreductionRedoxpropertyDispersioncapacityStructure-activityrelationshipRareearths

分类号： X701[环境科学与工程—环境工程]TQ426