Promoted catalytic property of Cu/SSZ-13 by introducing a minority of Mn for NO removal from diesel engine exhaust  

作　　者：Runnong Yang Wuyuan Liu Zhaoying Wang Ming Sun Guangying Fu Zihan Gao Wenjian Jiao Rui Li Lin Yu 

机构地区：[1]Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center,Jieyang 515200,China [2]Guangdong Engineering Technology Research Center of Modern Fine Chemical Engineering,School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China [3]Key Laboratory of Bioinorganic and Synthetic Chemistry,School of Chemistry,Sun Yat-sen University,Guangzhou 510275,China [4]Testing and Certification Business Department,China Automotive Technology and Research Center Company Limited,Wuhan 430056,China [5]Guangdong Foran Technology Company Limited,Foshan 528000,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第7期172-182,共11页中国化学工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (22278086)

摘　　要：The Cu-exchanged SSZ-13 with the small-pore chabazite framework is considered as a highly efficient catalyst for selective catalytic reduction of NO with NH_(3)(NH_(3)-SCR).In order to further improve the catalytic property,a series of Mn ion-assisted Cu/SSZ-13 powder catalysts were prepared by co-exchange method and stepwise exchange method.It is found that the NH_(3)-SCR activity,N_(2) selectivity,hydrothermal stability and sulfur resistance of Cu/SSZ-13 are promoted by introducing a minority of Mn(0.15%to 0.23%(mass))through co-exchange method.Characterization results reveal that the Cu,Mn co-exchange enables the higher amounts of Cu^(2+)active sites,the abundant medium strong and strong acid,the optimized ratio of Lewis acid to Brønsted acid etc.,which are required for a good NH_(3)-SCR catalytic property over broad temperature range and under harsh working environment.Moreover,a monolithic catalyst was prepared by impregnating a cordierite ceramic support into the coating slurry containing the optimized CuMn/SSZ-13 powder.The diesel engine bench tests show that Cu,Mn co-exchange gives the monolith catalyst a better catalytic property than commercial catalysts.This work provides an important guidance for the rational design of secondary-ion-assisted zeolites applied in NH_(3)-SCR.

关 键 词：MnCu/SSZ-13 Co-exchange ZEOLITE CATALYSIS Selective catalytic reduction 

分 类 号：TQ426[化学工程] X701[环境科学与工程—环境工程]