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Citation: Lihua HUANG, Jian HUA. Denitration performance of HoCeMn/TiO2 catalysts prepared by co-precipitation and impregnation methods[J]. Chinese Journal of Inorganic Chemistry, ;2024, 40(3): 629-645. doi: 10.11862/CJIC.20230315 shu

Denitration performance of HoCeMn/TiO2 catalysts prepared by co-precipitation and impregnation methods

  • 1.

    Insititute of Environment and Resources, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China

  • 2.

    National Engineering Research Center for Flue Gas Desulphurization, Chengdu 610064, China

  • Corresponding author: Lihua HUANG, 247860084@qq.com
  • Received Date: 19 August 2023
    Revised Date: 5 January 2024

Figures(13)

  • Impregnation and co-precipitation methods were used to synthesize HoCeMn/TiO2 catalysts for the reduction of NOx with NH3. Different kinds of characterization methods were used to explore the structures and performances of the catalysts. The results show that the co-precipitation method enhances the interactivity between the active component and carrier, thereby increasing the content of Ce3+, Mn4+, and adsorption oxygen on the surface of HoCeMnTi-C. As a result, it showed excellent low-temperature redox performance. In addition, HoCeMnTi-C prepared by the co-precipitation method possessed more surface acidic sites and stronger surface acidity. The improvement of surface acidity and redox performance is conducive to the adsorption and activation of ammonia, and thereby significantly improved its activity. The increase of acidic sites also restrained the adsorption of H2O and SO2, and therefore sulfur and water resistance of HoCeMnTi-C were significantly promoted. The reaction of selective catalytic reduction (SCR) on catalysts obeys the Eley-Rideal (E-R) mechanism. SO2 poisoning of catalysts was caused by the formation of sulfates, which cover or damage the active sites of the catalysts.
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