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<p>The process of catalytically oxidizing carbon monoxide (CO) remains a critical issue across various industrial sectors. However, it continues to be a challenge to achieve effective CO oxidation at low temperatures using non-noble metal catalysts. This study addresses these gaps by investigating the effects of dilute gallium (Ga) doping on the catalytic performance of flower-like ceria (CeO<sub>2</sub>) microspheres. By using a modified hydrothermal synthesis method, we prepared the Ga-doped CeO<sub>2</sub> microspheres and characterized their morphology, surface area, and evidence of oxygen vacancy through various experimental techniques as well as computational simulation method. Our findings disclosed that the incorporation of Ga significantly enhances the catalytic performance of CeO<sub>2</sub>, with the optimal doping level (2&#xa0;mol% Ga) achieving a 90% CO conversion temperature (T<sub>90</sub>) of 388.9&#xa0;°C, obviously lower than that of pristine CeO<sub>2</sub> (488.5&#xa0;°C). This work demonstrates that dilute Ga doping effectively improves the catalytic properties of CeO<sub>2</sub>-based materials, offering a potential strategy for developing effective CO oxidation catalysts.</p> Graphical Abstract <p></p>

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Enhanced Catalytic Performance Towards CO Oxidation of Broccoli-like Ceria Microspheres by Dilute Gallium Doping

  • 期刊论文

  • 发表日期：

    2025年3月12日

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  • Minai Zhang,
  • Jierui Xue,
  • Zhuolun Han,
  • Yan Wang,
  • Yizhang Guan,
  • Chee-Keong Tan

摘要

The process of catalytically oxidizing carbon monoxide (CO) remains a critical issue across various industrial sectors. However, it continues to be a challenge to achieve effective CO oxidation at low temperatures using non-noble metal catalysts. This study addresses these gaps by investigating the effects of dilute gallium (Ga) doping on the catalytic performance of flower-like ceria (CeO2) microspheres. By using a modified hydrothermal synthesis method, we prepared the Ga-doped CeO2 microspheres and characterized their morphology, surface area, and evidence of oxygen vacancy through various experimental techniques as well as computational simulation method. Our findings disclosed that the incorporation of Ga significantly enhances the catalytic performance of CeO2, with the optimal doping level (2 mol% Ga) achieving a 90% CO conversion temperature (T90) of 388.9 °C, obviously lower than that of pristine CeO2 (488.5 °C). This work demonstrates that dilute Ga doping effectively improves the catalytic properties of CeO2-based materials, offering a potential strategy for developing effective CO oxidation catalysts.

Graphical Abstract