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<p>Three kinds of mesoporous Au/CeMO<sub>x</sub> (M = Cu, Zr, Mo) catalysts were prepared by the hydrothermal method (HT) and precipitation method. The prepared catalysts were evaluated for their performance in CO oxidation and SO<sub>2</sub> resistance. Among the three metal-modified catalysts, Cu exhibited the most significant enhancement in CO oxidation activity, which can be attributed to its high BET surface area, large average pore volume, excellent reducibility, and abundant surface-adsorbed oxygen (O<sub>II</sub>). However, under SO<sub>2</sub> exposure, the deactivation rate of the catalysts followed the order: Au/CeMoO<sub>x</sub> &lt; Au/CeZrO<sub>x</sub> &lt; Au/CeO<sub>x</sub> &lt; Au/CeCuO<sub>x</sub>, indicating that Mo modification provided the greatest resistance to SO<sub>2</sub> poisoning. This enhanced stability was primarily ascribed to the role of Mo in modulating surface acidity and specific surface area, which inhibited SO<sub>2</sub> adsorption and the subsequent formation of SO<sub>4</sub><sup>2−</sup> species, as evidenced by SO<sub>2</sub>-TPD and FTIR analysis. The investigation of CO oxidation on both fresh and SO<sub>2</sub>-treated Au/CeMO<sub>x</sub> catalysts provides valuable insights for their potential industrial applications.</p> Graphical Abstract <p></p>

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Comparative Study on the CO Oxidation Performance and SO2 Resistance of Au/CeMOx (M = Cu, Zr, Mo) Catalysts

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Meidan Han,
  • Zehao Guo,
  • Xuefeng She,
  • Zhuo Zhang,
  • Qingguo Xue

摘要

Three kinds of mesoporous Au/CeMOx (M = Cu, Zr, Mo) catalysts were prepared by the hydrothermal method (HT) and precipitation method. The prepared catalysts were evaluated for their performance in CO oxidation and SO2 resistance. Among the three metal-modified catalysts, Cu exhibited the most significant enhancement in CO oxidation activity, which can be attributed to its high BET surface area, large average pore volume, excellent reducibility, and abundant surface-adsorbed oxygen (OII). However, under SO2 exposure, the deactivation rate of the catalysts followed the order: Au/CeMoOx < Au/CeZrOx < Au/CeOx < Au/CeCuOx, indicating that Mo modification provided the greatest resistance to SO2 poisoning. This enhanced stability was primarily ascribed to the role of Mo in modulating surface acidity and specific surface area, which inhibited SO2 adsorption and the subsequent formation of SO42− species, as evidenced by SO2-TPD and FTIR analysis. The investigation of CO oxidation on both fresh and SO2-treated Au/CeMOx catalysts provides valuable insights for their potential industrial applications.

Graphical Abstract