Abstract
The Ce-Cu-SAPO-18 samples were prepared by the ion exchange method. Physicochemical properties of the samples were systematically characterized by a number of analytical techniques, and Ce doping and hydrothermal temperature effects on NH3-SCR activity of Cu-SAPO-18 were also investigated. The results show that doping of Ce increased NH3-SCR activity and hydrothermal stability of the Cu-SAPO-18 sample. After Ce doping, a more amount of the isolated Cu2+ ions entered the D6R and the catalyst structure was more stable. The structure and catalytic activity of Ce-Cu-SAPO-18 remained almost intact after hydrothermal aging at 650 °C. After hydrothermal aging at 850 °C, however, the structure of Ce-Cu-SAPO-18 was greatly destroyed, and its catalytic activity declined remarkably. The high-temperature hydrothermal aging treatment led to decreases in amount of the isolated Cu2+ ions and acidic sites, destroying in the zeolitic structure, and drop in NH3-SCR activity.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 21277008 and 20777005), the National Key Research and Development Program of China (Grant No. 2017YFC0209905), and the Natural Science Foundation of Beijing (Grant No. 8082008). We also thank Prof. Ralph T. Yang (University of Michigan) for his helpful discussion and encouragement.
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Gao, Q., Ye, Q., Han, S. et al. Effect of Ce Doping on Hydrothermal Stability of Cu-SAPO-18 in the Selective Catalytic Reduction of NO with NH3. Catal Surv Asia 24, 134–142 (2020). https://doi.org/10.1007/s10563-020-09294-5
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DOI: https://doi.org/10.1007/s10563-020-09294-5