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Preparation of MnO2@CeO2 core–shell catalyst and its application in SCO denitration performance

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Abstract

Nitrogen oxides (NOx) could cause acid rain, photochemical smog, and even cause serious harm to human life and health and safety. Therefore, it was urgent to control and reduce NOx. In this paper, CeO2 with a spherical structure was prepared by hydrothermal method, and the influence of different preparation conditions on the formation of CeO2 was studied by orthogonal experiments. Then CeO2 was used as the carrier, and a MnO2@CeO2 core–shell catalyst with MnO2 as the core and CeO2 as the shell was developed. And it was successfully applied to SCO denitration. Through SEM, TEM and XRD characterization, the effects of different manganese-cerium ratios and core–shell morphology on the denitration performance were studied. The results showed that: (1) When the concentration of cerium chloride solution was 0.6 mol/L, urea was 30 g, glucose was 40 g, and the hydrothermal temperature is 200 ℃, the prepared CeO2 catalyst had uniform particle size and high dispersibility. Its catalytic activity was better than that of catalysts prepared under other conditions, and the conversion rate of NO at 250 ℃ was up to 85%; (2) The denitration performance of the MnO2@CeO2 composite3 catalyst was significantly better than that of the CeO2 catalyst alone. At the same time, the MnO2@CeO2 core–shell catalyst prepared with MnCl2·4H2O as the manganese precursor had a better conversion rate of NO than that of the other two manganese precursor catalysts.

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Acknowledgements

This work is supported by the Natural Science Foundational Research Program of Shaanxi Province [2019JL-01]; Key R & D Program in Shaanxi Province [2021SF-445]; Key Laboratory Project of Geological Guarantee for Green Coal Development in Shaanxi Province [DZBZ2021Z-01].

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Authors and Affiliations

  1. School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710054, China

    Lei Zhang, Zhikun Han & Yuzhen Han

  2. Institute of Water Resources and Hydro-Electric Engineering, Xi’an University of Technology, Xi’an, 710048, China

    Yang Jia

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Zhang, L., Han, Z., Jia, Y. et al. Preparation of MnO2@CeO2 core–shell catalyst and its application in SCO denitration performance. Appl. Phys. A 128, 568 (2022). https://doi.org/10.1007/s00339-022-05543-8

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