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Denitrification performance and sulfur resistance mechanism of Sm-Mn catalyst for low temperature NH3-SCR

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Abstract

MnOx and Sm-Mn catalysts were prepared with the coprecipitation method, and they showed excellent activities and sulfur resistances for the selective catalytic reduction of NOx by NH3 between 50 and 300 °C in the presence of excess oxygen. 0.10Sm-Mn catalyst indicated better catalytic activity and sulfur resistance. Additionally, the Sm doping led to multi-aspect impacts on the phases, morphology structures, gas adsorption, reactions process, and specific surface areas. Therefore, it significantly enhances the NO conversion, N2 selectivity, and sulfur resistance. Based on various experimental characterization results, the reaction mechanism of catalysts and the effect of SO2 on the reaction process about the catalysts were extensively explored. For 0.10Sm-Mn catalyst, manganese sulfate and sulfur ammonium cannot be generated broadly under the influence of SO2 and the amount of surface adsorbed oxygen. The Bronsted acid sites strengthen significantly due to the addition of SO2, enhancing the sulfur resistance of the 0.10Sm-Mn catalyst.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant No. 52102367) and the Fundamental Research Funds for the Central Universities (WUT, effect of the synthesis method on denitrification performances of the Mn-based spinel catalysts).

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Authors and Affiliations

  1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China

    Junlin Xie, Yanli Ye, Qinglei Li, Tianhong Kang, Sensheng Hou, Qiqi Jin, Feng He & De Fang

  2. Center for Materials Research and Analysis, Wuhan University of Technology, Wuhan, 430070, China

    De Fang

  3. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China

    Junlin Xie, Yanli Ye, Qinglei Li, Tianhong Kang, Sensheng Hou, Qiqi Jin & Feng He

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  1. Junlin Xie
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Correspondence to De Fang.

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Xie, J., Ye, Y., Li, Q. et al. Denitrification performance and sulfur resistance mechanism of Sm-Mn catalyst for low temperature NH3-SCR. Front. Chem. Sci. Eng. 17, 617–633 (2023). https://doi.org/10.1007/s11705-022-2258-8

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