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The Comparative Study of Reaction Mechanisms and Catalytic Performances of Cu–SSZ-13 and Fe–SSZ-13 for the NH3-SCR Reaction

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Abstract

The catalytic performances and mechanism differences of model catalysts Cu–SSZ-13 and Fe–SSZ-13 with similar metal content and Si/Al ratio were compared. In the NH3-SCR reaction, Cu–SSZ-13 had a good NO conversion at low temperature, broad active temperature windows and better hydrothermal stability. Fe–SSZ-13 showed better high-temperature NO conversion rate and better resistance to sulfur poisoning, but poorer low-temperature NH3-SCR activity. NH3-TPD verified the content difference of L-NH3 and B-NH3 of Cu- and Fe–SSZ-13. UV–Vis DRS, EPR, H2-TPR indicated the active species of Cu- and Fe–SSZ-13. Results showed that Cu–SSZ-13 only had one type active species of Cu2+, Fe–SSZ-13 had Fe3+ species that acted as active centers at low temperature and reactivity oligomeric Fe species at high temperature. The diffuse reflection infrared Fourier transform spectrum (DRIFTS) results showed that the reactions of Cu–SSZ-13 and Fe–SSZ-13 at low temperature both followed the Eley–Rideal (E–R) mechanism and the Langmuir–Hinshelwood (L–H) mechanism. Cu–SSZ-13 could perform the catalytic process well under both mechanisms, but when Fe–SSZ-13 followed the E–R mechanism, there were many B-NH3 species, which was not conducive to the reaction. When following the L–H mechanism, the speed of NO3− participating in the reaction was slow due to ammonia inhibition, resulting in poor low-temperature activity.

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Acknowledgements

This work acknowledges financial support from the National Natural Science Foundation of China (21473064) and the Analytical and Testing Center of Huazhong University of Science and Technology for the use of its facilities.

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  1. Kaiwei Qin and Lei Guo have contributed equally to the work.

Authors and Affiliations

  1. Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China

    Kaiwei Qin, Lei Guo, Shujun Ming, Shoute Zhang & Tao Li

  2. College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang, 438000, People’s Republic of China

    Shujun Ming

  3. College of Chemistry, Central China Normal University, Wuhan, 430079, People’s Republic of China

    Yanbin Guo

  4. DongFeng Trucks R&D Center, Zhushanhu Road No. 653, Wuhan, 430056, People’s Republic of China

    Lei Pang

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Qin, K., Guo, L., Ming, S. et al. The Comparative Study of Reaction Mechanisms and Catalytic Performances of Cu–SSZ-13 and Fe–SSZ-13 for the NH3-SCR Reaction. Catal Surv Asia 26, 115–128 (2022). https://doi.org/10.1007/s10563-022-09353-z

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