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<p>Interface engineering is crucial in the design of supported metal catalysts, as it significantly influences the catalytic process, particularly in terms of selectivity. Herein, we discover the redispersion of Ni nanoparticles from SiO<sub>2</sub> to molybdenum carbide (Mo<sub>2</sub>C) being induced by the strong interaction between metal and Mo<sub>2</sub>C. Parameters affect such migration are thoroughly investigated from carbon source, proximity between Ni and Mo<sub>2</sub>C to activation atmosphere and temperature. The established dual interface on Mo<sub>2</sub>C-Ni/SiO<sub>2</sub> catalyst exhibits excellent catalytic performance for CO<sub>2</sub> hydrogenation, readily shifting the selectivity from 91% CO on Ni/Mo<sub>2</sub>C to near 100% CH<sub>4</sub> on Mo<sub>2</sub>C-Ni/SiO<sub>2</sub>. Density functional theory calculations further verify the interfacial synergy between Ni/Mo<sub>2</sub>C and Ni/SiO<sub>2</sub> sites with low barrier for CO<sub>2</sub> activation and a subsequent successive hydrogenation of CO. These findings highlight the important role of strong metal-support interaction (SMSI) induced metal redispersion for the rational fabrication of dual interfaces, leading to a highly active catalyst for target products.</p>

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Ni redispersion from SiO2 to molybdenum carbide creates dual interfaces to boost tandem CO2 hydrogenation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月23日

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  • Haiyan Wang,
  • Xuetao Qin,
  • Zirui Gao,
  • Yanan Diao,
  • Shenghua Liu,
  • Mi Peng,
  • Shida Liu,
  • Shuandi Hou,
  • Xin Liu,
  • Xinwen Guo,
  • Ding Ma,
  • Chuan Shi

摘要

Interface engineering is crucial in the design of supported metal catalysts, as it significantly influences the catalytic process, particularly in terms of selectivity. Herein, we discover the redispersion of Ni nanoparticles from SiO2 to molybdenum carbide (Mo2C) being induced by the strong interaction between metal and Mo2C. Parameters affect such migration are thoroughly investigated from carbon source, proximity between Ni and Mo2C to activation atmosphere and temperature. The established dual interface on Mo2C-Ni/SiO2 catalyst exhibits excellent catalytic performance for CO2 hydrogenation, readily shifting the selectivity from 91% CO on Ni/Mo2C to near 100% CH4 on Mo2C-Ni/SiO2. Density functional theory calculations further verify the interfacial synergy between Ni/Mo2C and Ni/SiO2 sites with low barrier for CO2 activation and a subsequent successive hydrogenation of CO. These findings highlight the important role of strong metal-support interaction (SMSI) induced metal redispersion for the rational fabrication of dual interfaces, leading to a highly active catalyst for target products.