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<p>This research paper examines the performance of strontium (Sr) promoted nickel (Ni) catalysts supported on magnesium oxide (MgO) in the dry reforming of methane (DRM) into syngas. The characterization of these catalysts is carried out using a range of analytical techniques, including measurements of surface area and porosity, thermogravimetric analysis (TGA), X-ray diffraction (XRD), transmission electron microscopy (TEM), hydrogen temperature-programmed reduction (H<sub>2</sub>-TPR), temperature-programmed oxidation (TPO) and desorption (TPD) studies. The concentration of active sites, as well as the presence of acid and basic sites on the catalyst surface, are the primary factors influencing the catalytic activity of the 5Ni + xSr-MgO catalysts (where x = 1, 2, 3, and 4 wt%). Ni, supported over MgO, has few active sites and lacks a strong basic site, which results in minimum catalytic activity. Adding 1–4 wt% Sr over 5Ni-MgO induces the formation of higher concentrations of active sites and an increased population of strong basic sites. At 3 wt% Sr loading, concentration of active sits, strong basic sites, and strong acid sites are optimum which can activate CH<sub>4</sub> and CO<sub>2</sub> timely for DRM rather than coke deposition. So, 5Ni + 3Sr-MgO achieved 58.4% CH<sub>4</sub> conversion (with H<sub>2</sub>/CO ratio 1.1) at 700 <sup>°</sup>C and ~ 82% CH<sub>4</sub> conversion at 750 <sup>°</sup>C. This study offers insights for turning a cheap catalyst system (5Ni-MgO) into a high-performance catalyst by optimum loading of Sr promotor.</p> Graphical abstract <p></p>

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Tailoring Ni + Sr-MgO Catalysts for Efficient Dry Reforming of Methane: A Performance Study

  • 期刊论文

  • 发表日期：

    2025年2月26日

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  • Abdulaziz Bentalib,
  • Dalia A. Ali,
  • Maher M. Alrashed,
  • Ahmed A. Ibrahim,
  • Alaaddin M. M. Saeed,
  • Anis H. Fakeeha,
  • Ahmed E. Abasaeed,
  • Rawesh Kumar,
  • Ahmed S. Al-Fatesh

摘要

This research paper examines the performance of strontium (Sr) promoted nickel (Ni) catalysts supported on magnesium oxide (MgO) in the dry reforming of methane (DRM) into syngas. The characterization of these catalysts is carried out using a range of analytical techniques, including measurements of surface area and porosity, thermogravimetric analysis (TGA), X-ray diffraction (XRD), transmission electron microscopy (TEM), hydrogen temperature-programmed reduction (H2-TPR), temperature-programmed oxidation (TPO) and desorption (TPD) studies. The concentration of active sites, as well as the presence of acid and basic sites on the catalyst surface, are the primary factors influencing the catalytic activity of the 5Ni + xSr-MgO catalysts (where x = 1, 2, 3, and 4 wt%). Ni, supported over MgO, has few active sites and lacks a strong basic site, which results in minimum catalytic activity. Adding 1–4 wt% Sr over 5Ni-MgO induces the formation of higher concentrations of active sites and an increased population of strong basic sites. At 3 wt% Sr loading, concentration of active sits, strong basic sites, and strong acid sites are optimum which can activate CH4 and CO2 timely for DRM rather than coke deposition. So, 5Ni + 3Sr-MgO achieved 58.4% CH4 conversion (with H2/CO ratio 1.1) at 700 °C and ~ 82% CH4 conversion at 750 °C. This study offers insights for turning a cheap catalyst system (5Ni-MgO) into a high-performance catalyst by optimum loading of Sr promotor.

Graphical abstract