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Abstract <p>TiO<sub>2</sub>-supported Au catalysts (Au-TiO<sub>2</sub>) are considered as good candidates for the water-gas shift (WGS) reaction. In general, the structures and properties of TiO<sub>2</sub> supports are essential for optimizing the performance of Au-TiO<sub>2</sub> catalysts. Herein, an ethanol-assisted hydrothermal strategy is reported to fabricate a series of Au-TiO<sub>2</sub>-<i>X</i> catalysts (where <i>X</i> stands for the concentration of ethanol) with different structural properties by adjusting the ethanol dosage. Among the catalysts, Au-TiO<sub>2</sub>-0.75 exhibits the highest activity for the WGS reaction, accompanied by an extended catalytic stability after four cycles. Meanwhile, Au-TiO<sub>2</sub>-0.75 also exhibits superior intrinsic activity, as evidenced by higher reaction rates of CO elimination and lower apparent activation energies. According to systematic characterizations, the optimized catalyst Au-TiO<sub>2</sub>-0.75 with moderate ethanol assistance displays the smallest support size, the highest Au dispersion, as well as the largest number of Au<sup>+</sup> sites and abundant oxygen vacancies (O<sub>v</sub>) near the surface of TiO<sub>2</sub>, thereby enhancing the WGS reaction. This work provides a novel approach to engineering the catalyst interface structure for efficient WGS reactions.</p> Graphic abstract <p></p>

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Collaborative modulation of support properties and oxygen vacancies in Au-TiO2 catalysts through ethanol assisting for boosting the water‐gas shift performance

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Li-Hua Deng,
  • Na Li,
  • Chao Gu,
  • Sheng-Hong Li,
  • Meng-Jia Li,
  • Xiao-Dong Liang,
  • Lin-Feng Gu,
  • Zhe Hong,
  • Li Song,
  • Lei Li

摘要

Abstract

TiO2-supported Au catalysts (Au-TiO2) are considered as good candidates for the water-gas shift (WGS) reaction. In general, the structures and properties of TiO2 supports are essential for optimizing the performance of Au-TiO2 catalysts. Herein, an ethanol-assisted hydrothermal strategy is reported to fabricate a series of Au-TiO2-X catalysts (where X stands for the concentration of ethanol) with different structural properties by adjusting the ethanol dosage. Among the catalysts, Au-TiO2-0.75 exhibits the highest activity for the WGS reaction, accompanied by an extended catalytic stability after four cycles. Meanwhile, Au-TiO2-0.75 also exhibits superior intrinsic activity, as evidenced by higher reaction rates of CO elimination and lower apparent activation energies. According to systematic characterizations, the optimized catalyst Au-TiO2-0.75 with moderate ethanol assistance displays the smallest support size, the highest Au dispersion, as well as the largest number of Au+ sites and abundant oxygen vacancies (Ov) near the surface of TiO2, thereby enhancing the WGS reaction. This work provides a novel approach to engineering the catalyst interface structure for efficient WGS reactions.

Graphic abstract