Effects of impregnation sequence on the NH_(3)-SCR activity and hydrothermal stability of a Ce-Nb/SnO_(2) catalyst  

作　　者：Ying Zhu Wenpo Shan Zhihua Lian Jingjing Liu Yan Zhang Hong He 

机构地区：[1]Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China [2]Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control,Ningbo Urban Environment Observation and Research Station,Institute of Urban Environment,Chinese Academy of Sciences,Ningbo 315800,China [3]State Key Joint Laboratory of Environment Simulation and Pollution Control,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [4]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Environmental Sciences》2024年第4期450-457,共8页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52225004 and 22276182);the National Key R&D Program of China(Nos.2022YFC3701804 and 2022YFC3704400);the Science and Technology Innovation“2025”major program in Ningbo(No.2020Z103)。

摘　　要：Hydrothermal stability is crucial for the practical application of deNO_(x)catalyst on diesel vehicles,for the selective catalytic reduction of NO_(x)with NH_(3)(NH_(3)-SCR).SnO_(2)-based materials possess superior hydrothermal stability,which is attractive for the development of NH_(3)-SCR catalyst.In this work,a series of Ce-Nb/SnO_(2)catalysts,with Ce and Nb loading on SnO_(2)support,were prepared by impregnation method.It was found that,the NH_(3)-SCR activities and hydrothermal stabilities of the Ce-Nb/SnO_(2)catalysts significantly varied with the impregnation sequences,and the Ce-Nb(f)/SnO_(2) catalyst that firstly impregnated Nb and then impregnated Ce exhibited the best performance.The characterization results revealed that CeNb(f)/SnO_(2)possessed appropriate acidity and redox capability.Furthermore,the strong synergistic effect between Nb and Sn species stabilized the structure and maintained the dispersion of acid sites.This study may provide a new understanding for the effect of impregnation sequence on activity and hydrothermal stability and a new environmental-friendly NH_(3)-SCR catalyst with potential applications for NO_(x)removal from diesel and hydrogenfueled engines.

关 键 词：NO_(x)emission control NH_(3)-SCR Hydrothermal stability Ce-Nb/SnO_(2)catalyst Impregnation sequence 

分 类 号：TQ426[化学工程] X701[环境科学与工程—环境工程]