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<p>The Ni-Re/TiO<sub>2</sub> catalyst was synthesized <i>via</i> the impregnation method, exhibiting exceptional catalytic performance in the hydrogenation of dimethyl oxalate (DMO) to methyl glycolate (MG). With low Ni and Re loadings (2.5Ni0.5Re/TiO<sub>2</sub>), the catalyst achieved 94% DMO conversion and 96% MG selectivity, maintaining impressive stability for over 200&#xa0;h, highlighting its potential for industrial applications. Characterization studies demonstrated that Re doping promotes strong electronic interactions between Ni and Re, stabilizing and enhancing the dispersion of Ni nanoparticles, which facilitates H<sub>2</sub> activation. Concurrently, the presence of ReOx species introduces abundant Lewis acid sites, which enhance the adsorption and activation of C = O groups, thus facilitating DMO adsorption and dissociation. The superior catalytic performance arises from the synergistic interactions between ReOx and Ni species, providing valuable insights into the development of low-loading, high-activity catalysts for DMO hydrogenation.</p> Graphical Abstract <p></p>

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Re-Doped Ni/TiO₂ Catalyst with Enhanced Active Site Dispersion and Optimized Adsorption Behavior for High-Efficiency Hydrogenation of Dimethyl Oxalate To Methyl Glycolate

  • 期刊论文

  • 发表日期：

    2025年10月18日

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  • Hao Wang,
  • Ni Zhang,
  • Jiang Gong,
  • Fengling Zheng,
  • Jianwei Li,
  • Zhoulin Hu,
  • Chuancai Zhang

摘要

The Ni-Re/TiO2 catalyst was synthesized via the impregnation method, exhibiting exceptional catalytic performance in the hydrogenation of dimethyl oxalate (DMO) to methyl glycolate (MG). With low Ni and Re loadings (2.5Ni0.5Re/TiO2), the catalyst achieved 94% DMO conversion and 96% MG selectivity, maintaining impressive stability for over 200 h, highlighting its potential for industrial applications. Characterization studies demonstrated that Re doping promotes strong electronic interactions between Ni and Re, stabilizing and enhancing the dispersion of Ni nanoparticles, which facilitates H2 activation. Concurrently, the presence of ReOx species introduces abundant Lewis acid sites, which enhance the adsorption and activation of C = O groups, thus facilitating DMO adsorption and dissociation. The superior catalytic performance arises from the synergistic interactions between ReOx and Ni species, providing valuable insights into the development of low-loading, high-activity catalysts for DMO hydrogenation.

Graphical Abstract