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

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外文摘要：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 NH3 (NH3-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 NH3-SCR activity,N2 selectivity,hydro-thermal 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 Cu2+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 NH3-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 NH3-SCR.

外文关键词：

MnCu/SSZ-13Co-exchangeZeoliteCatalysisSelective catalytic reduction

作者：

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

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作者单位：

Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center,Jieyang 515200,China

Guangdong Engineering Technology Research Center of Modern Fine Chemical Engineering,School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China

Guangdong Foran Technology Company Limited,Foshan 528000,China

Key Laboratory of Bioinorganic and Synthetic Chemistry,School of Chemistry,Sun Yat-sen University,Guangzhou 510275,China

Testing and Certification Business Department,China Automotive Technology and Research Center Company Limited,Wuhan 430056,China

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基金：

National Natural Science Foundation of China

项目编号：

22278086

出版年：

2024

DOI：

10.1016/j.cjche.2024.03.022