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Citation: Peng YUE, Liyao SHI, Jinglei CUI, Huirong ZHANG, Yanxia GUO. Effects of Ce and Mn promoters on the selective oxidation of ammonia over V2O5/TiO2 catalyst[J]. Chinese Journal of Inorganic Chemistry, ;2025, 41(2): 293-307. doi: 10.11862/CJIC.20240210 shu

Effects of Ce and Mn promoters on the selective oxidation of ammonia over V2O5/TiO2 catalyst

  • Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030031, China

  • Corresponding author: Jinglei CUI, cuijl@sxu.edu.cn
  • Received Date: 4 June 2024
    Revised Date: 15 November 2024

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  • A series of Ce, Mn-modified catalysts were prepared based on the V2O5/TiO2 catalyst matrix, and the structure and active components of the catalysts were analyzed using nitrogen adsorption-desorption, X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscope. The reaction activity was also explored. The results indicated that the prepared modified V2O5/TiO2 catalysts had good dispersion, and the Ce-Mn bimetalmodification improved the NH3 conversion rate and N2 selectivity of catalysts. When the loading amounts of Ce and Mn (the mass ratio of Ce or Mn to TiO2) were 8% and 6%, respectively, the NH3 conversion rate of the modified material reached 100% at 310 ℃, with an N2 selectivity of 78%. In-situ diffuse reflectance Fourier transform infrared spectroscopy characterization showed that NH3 adsorbed on the surface hydroxyl groups of the catalyst would preferentially participate in the reaction. As the temperature increased, NH3 adsorbed on the Brønsted and Lewis acid sites on the catalyst surface began to participate in the reaction, and at higher temperatures, the Lewis acid sites were the main sites for NH3 conversion.
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