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<p>Converting CO<sub>2</sub> into CO via reverse water gas shift (RWGS) reaction is a key step for carbon recycling. Molybdenum trioxide (MoO<sub>3</sub>) is a promising precatalyst due to its high activity and near-unity CO selectivity, yet the role of support properties remains unclear. To address this, a series of MoO<sub>3</sub>-based catalysts supported on MgO, <i>γ</i>-Al<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, TiO<sub>2</sub>, ZrO<sub>2</sub>, and CeO<sub>2</sub> were prepared. Systematic characterizations show that MoO<sub>3</sub> undergoes <i>in situ</i> carburization to Mo<sub>2</sub>C, and the extent of carburization correlates positively with catalytic activity. The formation of active Mo<sub>2</sub>C is governed by the metal oxide-support interaction (MOSI): strong MOSI between MoO<sub>3</sub> and basic supports (MgO, CeO<sub>2</sub>) promotes stable solid solutions that suppress carburization, whereas acidic and amphoteric supports preserve MoO<sub>3</sub> crystallites, enabling efficient carburization and high RWGS performance. Among all catalysts, MoO<sub><i>x</i></sub>C<sub><i>y</i></sub>/SiO<sub>2</sub> exhibits the weakest MOSI, the highest surface Mo<sub>2</sub>C concentration, and thus superior mass-specific activity. The ionic potential of the support serves as a descriptor for MOSI strength, while the specific surface area introduces a certain deviation for amphoteric supports (<i>γ</i>-Al<sub>2</sub>O<sub>3</sub>, TiO<sub>2</sub>, ZrO<sub>2</sub>). This work provides clear support selection criteria and a theoretical foundation for rational design of high-performance Mo-based RWGS catalysts.</p>

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Support effect of MoOxCy catalyst in the reverse water gas shift reaction

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Qiuying Jia,
  • Dazhuang Li,
  • Xiaoqiao Zhang,
  • Xinlan Na,
  • Shugang Sun,
  • Mei-Yan Wang,
  • Yong Wang,
  • Shengping Wang,
  • Xinbin Ma

摘要

Converting CO2 into CO via reverse water gas shift (RWGS) reaction is a key step for carbon recycling. Molybdenum trioxide (MoO3) is a promising precatalyst due to its high activity and near-unity CO selectivity, yet the role of support properties remains unclear. To address this, a series of MoO3-based catalysts supported on MgO, γ-Al2O3, SiO2, TiO2, ZrO2, and CeO2 were prepared. Systematic characterizations show that MoO3 undergoes in situ carburization to Mo2C, and the extent of carburization correlates positively with catalytic activity. The formation of active Mo2C is governed by the metal oxide-support interaction (MOSI): strong MOSI between MoO3 and basic supports (MgO, CeO2) promotes stable solid solutions that suppress carburization, whereas acidic and amphoteric supports preserve MoO3 crystallites, enabling efficient carburization and high RWGS performance. Among all catalysts, MoOxCy/SiO2 exhibits the weakest MOSI, the highest surface Mo2C concentration, and thus superior mass-specific activity. The ionic potential of the support serves as a descriptor for MOSI strength, while the specific surface area introduces a certain deviation for amphoteric supports (γ-Al2O3, TiO2, ZrO2). This work provides clear support selection criteria and a theoretical foundation for rational design of high-performance Mo-based RWGS catalysts.