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Coupled Catalytic Oxidation–Reduction and Hydrolysis with Ce1Mn2 Catalysts for HCN and NO Removal

  • Xueqian Wang
    Xueqian Wang
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
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  • Ruonan Sun
    Ruonan Sun
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
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  • Langlang Wang*
    Langlang Wang
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    *Email: [email protected]
  • Yibing Xie
    Yibing Xie
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
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  • Lei Tao
    Lei Tao
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
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  • Yixing Ma
    Yixing Ma
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
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  • , and 
  • Ping Ning*
    Ping Ning
    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    *Email: [email protected]
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Cite this: Energy Fuels 2020, 34, 7, 8543–8551
Publication Date (Web):June 15, 2020
https://doi.org/10.1021/acs.energyfuels.0c00863
Copyright © 2020 American Chemical Society
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Abstract

Metal oxide catalysts with different cerium and manganese ratios were synthesized by a co-precipitation method to remove HCN and NO from exhaust gas. Ce1Mn2 exhibited the highest HCN conversion and NO removal effect with a maximum N2 selectivity of 72%. The existence of NO can promote the conversion of HCN at low temperatures, which may be due to the reaction between the two substances forming formyl and nitrogen. CO was not detected as a product over the entire reaction temperature range. However, high concentrations of CO2, NH3, and a small amount of NOx were detected. Results indicate that HCN was first oxidized to isocyanate followed by isocyanate further reacting with H2O to generate NH3 and CO2. Part of NO was removed by the selective catalytic reduction (SCR) and oxidation reaction. Catalyst characterization showed that Ce1Mn2 exhibited a higher specific surface area, with manganese oxide mainly existing in an amorphous state, potentially forming a solid solution structure with cerium oxide. The introduction of a suitable amount of cerium was beneficial, increasing the concentration of chemisorbed oxygen on the catalyst surface. The catalyst also exhibited the properties of adsorbing H2O, which was helpful for the isocyanic acid hydrolysis reaction.

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This article is cited by 1 publications.

  1. Lu Hu, Nan Jiang, Bangfa Peng, Zhengyan Liu, Jie Li, Yan Wu. Removal of dimethyl sulfide by post-plasma catalysis over CeO2-MnO catalysts and reaction mechanism analysis. Chemosphere 2021, 274 , 129910. https://doi.org/10.1016/j.chemosphere.2021.129910