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The hydrogenation of CO2 to CO through reverse water–gas shift (RWGS) reaction is a process that offers significant potential for future large-scale industrial utilization. Within the scope of this study, a novel catalyst system comprising nickel (Ni) immobilized on silica (SiO2) nanosheets, denoted as Ni@SiO2NS, has been synthesized through an in-situ calcination technique. This method has been demonstrated to significantly augment the conversion of CO2 and the selectivity for CO production in the RWGS reaction. The SiO2 nanosheets has a large surface area and improved the CO2 absorption, served as a suitable platform for anchoring Ni. Notably, the Ni@SiO2NS catalyst with a Ni content of 10 wt% exhibited a higher CO selectivity of 84% at reaction temperature of 500℃, while a low CO selectivity of 41% for impregnation contrast sample Ni/SiO2. The study further revealed that the in-situ calcination method facilitated a strong bond between Ni and the SiO2 nanosheets, enhancing the dispersion of Ni particles and strong metal–support interaction. This, in turn, contributed to the improved activity of the catalyst in the RWGS, while simultaneously preventing the deactivation of Ni through sintering during the reaction process.

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Ni-Embedded SiO2 Nanosheet for Reverse Water–Gas Shift Reaction

  • 会议论文

  • 发表日期：

    2025年

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  • Xuhui Zou,
  • Runjing Xu,
  • Yangang Wang,
  • Lifeng Cui

摘要

The hydrogenation of CO2 to CO through reverse water–gas shift (RWGS) reaction is a process that offers significant potential for future large-scale industrial utilization. Within the scope of this study, a novel catalyst system comprising nickel (Ni) immobilized on silica (SiO2) nanosheets, denoted as Ni@SiO2NS, has been synthesized through an in-situ calcination technique. This method has been demonstrated to significantly augment the conversion of CO2 and the selectivity for CO production in the RWGS reaction. The SiO2 nanosheets has a large surface area and improved the CO2 absorption, served as a suitable platform for anchoring Ni. Notably, the Ni@SiO2NS catalyst with a Ni content of 10 wt% exhibited a higher CO selectivity of 84% at reaction temperature of 500℃, while a low CO selectivity of 41% for impregnation contrast sample Ni/SiO2. The study further revealed that the in-situ calcination method facilitated a strong bond between Ni and the SiO2 nanosheets, enhancing the dispersion of Ni particles and strong metal–support interaction. This, in turn, contributed to the improved activity of the catalyst in the RWGS, while simultaneously preventing the deactivation of Ni through sintering during the reaction process.