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.
- selective oxidation of ammonia,
- V₂O₅/TiO₂,
- catalyst,
- oxidation,
- support,
- metal promoter,
- reaction mechanism
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Effects of Ce and Mn promoters on the selective oxidation of ammonia over V2O5/TiO2 catalyst

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