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<p>Mesoporous silica (SiO<sub>2</sub>) was prepared using a simple procedure from rice husks without the application of a template. Incipient wetness impregnation method was employed to prepare magnesium-doped nickel-copper- and nickel–cobalt-containing SiO<sub>2</sub> catalysts. The obtained materials were characterized by X-ray powder diffraction (XRD), N<sub>2</sub> physisorption, transmission electron microscopy (TEM), temperature-programmed reduction (TPR-TGA), and NMR and XPS spectroscopies. The study demonstrated the significant influence of Ni and Co/Cu content, as well as the sequence of Mg promotion (before or after the nickel-copper- and nickel–cobalt-modification) on the physico-chemical properties of the catalysts. The peculiar properties of the mesoporous carrier positively influenced the formation of finely dispersed nickel and/or copper/cobalt oxide species, which were readily reducible at temperatures below 600&#xa0;°C. XPS analysis revealed that the surface of Mg-doped Ni-Co supported SiO<sub>2</sub> catalysts was rich in nickel. All the prepared catalysts were active in CO<sub>2</sub> hydrogenation to methane. The Mg-doped Ni-Co supported SiO<sub>2</sub> catalysts showed higher catalytic activity compared to their Mg-doped Ni-Cu counterparts. The 1.5Mg10Ni5Co/SiO<sub>2</sub> catalyst demonstrated 82% CO<sub>2</sub> conversion and 99.5% selectivity to methane. The activity and selectivity of this catalyst was maintained at 400&#xa0;°C for a reaction time of 4&#xa0;h.</p>

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CO2 methanation on Mg-doped Ni-Cu/Co modified mesoporous SiO2 derived from rice husks

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Margarita Popova,
  • Momtchil Dimitrov,
  • Manuela Oykova,
  • Pavletta Shestakova,
  • Daniela Kovacheva,
  • Genoveva Atanasova,
  • Ágnes Szegedi

摘要

Mesoporous silica (SiO2) was prepared using a simple procedure from rice husks without the application of a template. Incipient wetness impregnation method was employed to prepare magnesium-doped nickel-copper- and nickel–cobalt-containing SiO2 catalysts. The obtained materials were characterized by X-ray powder diffraction (XRD), N2 physisorption, transmission electron microscopy (TEM), temperature-programmed reduction (TPR-TGA), and NMR and XPS spectroscopies. The study demonstrated the significant influence of Ni and Co/Cu content, as well as the sequence of Mg promotion (before or after the nickel-copper- and nickel–cobalt-modification) on the physico-chemical properties of the catalysts. The peculiar properties of the mesoporous carrier positively influenced the formation of finely dispersed nickel and/or copper/cobalt oxide species, which were readily reducible at temperatures below 600 °C. XPS analysis revealed that the surface of Mg-doped Ni-Co supported SiO2 catalysts was rich in nickel. All the prepared catalysts were active in CO2 hydrogenation to methane. The Mg-doped Ni-Co supported SiO2 catalysts showed higher catalytic activity compared to their Mg-doped Ni-Cu counterparts. The 1.5Mg10Ni5Co/SiO2 catalyst demonstrated 82% CO2 conversion and 99.5% selectivity to methane. The activity and selectivity of this catalyst was maintained at 400 °C for a reaction time of 4 h.