SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2024, Vol. 71 ›› Issue (7): 172-182.DOI: 10.1016/j.cjche.2024.03.022

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

Runnong Yang1,2,5, Wuyuan Liu2, Zhaoying Wang2, Ming Sun1,2, Guangying Fu3, Zihan Gao2, Wenjian Jiao4, Rui Li3, Lin Yu1,2   

  1. 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
  • Received:2023-09-11 Revised:2024-03-11 Online:2024-08-30 Published:2024-07-28
  • Contact: Lin Yu,E-mail:gych@gdut.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (22278086). Thanks to the technique support of the Analysis and Test Center of the Guangdong University of Technology.

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

Runnong Yang1,2,5, Wuyuan Liu2, Zhaoying Wang2, Ming Sun1,2, Guangying Fu3, Zihan Gao2, Wenjian Jiao4, Rui Li3, Lin Yu1,2   

  1. 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
  • 通讯作者: Lin Yu,E-mail:gych@gdut.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (22278086). Thanks to the technique support of the Analysis and Test Center of the Guangdong University of Technology.

Abstract: 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, 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 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.

Key words: MnCu/SSZ-13, Co-exchange, Zeolite, Catalysis, Selective catalytic reduction

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, 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 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.

关键词: MnCu/SSZ-13, Co-exchange, Zeolite, Catalysis, Selective catalytic reduction