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<p>The partial oxidation of methane into syngas may protect the environment by consuming potential greenhouse gas, CH<sub>4</sub>, and yield hydrogen-rich synthetic feedstock to industries. Herein, in the target of developing POM catalyst, silica-zirconia (SZ) is used as support, 5&#xa0;wt.% Ni as an active metal site and 0.25–1&#xa0;wt.% Ga as a promoter. Catalysts are characterized by X-ray diffraction study, surface area-porosity, Raman spectroscopy, thermogravimetry, and temperature-programmed reduction–oxidation-reduction cyclic experiments. The Ga-promoted Ni-based catalysts attain a higher concentration of “strongly interacted reducible NiO” than “weakly interacted reducible NiO” in the presence of oxygen and hydrogen. 0.25&#xa0;wt.% Ga-promoted 5Ni/SZ attains the initial highest concentration of “strongly interacted reducible NiO,” its concentration remains higher even against the molecular oxygen. 5Ni0.25&#xa0;Ga/SZ catalyzes 51% CH<sub>4</sub> to yield 50% H<sub>2</sub> (H<sub>2</sub>/CO = 2.5) through POM, whereas a 35% CO<sub>2</sub> yield is also noticed through parallel participation of the TOM reaction. 675&#xa0;°C reaction temperature, 8000&#xa0;ccg⁻<sup>1</sup>&#xa0;h⁻<sup>1</sup> gas hourly space velocity, and 1.50&#xa0;CH<sub>4</sub>/O<sub>2</sub> ratio are set over 5Ni0.25&#xa0;Ga/YZ by statistically predicted models like response surface methodology under center composite design. Under these predicted conditions, 83% CH<sub>4</sub> conversion, 81% H<sub>2</sub> yield, and 2.5&#xa0;H<sub>2</sub>/CO ratio are constantly obtained up to 30&#xa0;h on stream. Such a high catalytic activity on optimized reaction conditions makes 5Ni0.25&#xa0;Ga/YZ a highly potent catalyst in achieving the hydrogen energy goal at the expense of CH<sub>4</sub> depletion.</p> Graphical Abstract <p></p>

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Gallium-promoted Ni/SiO2-ZrO2 catalysts for hydrogen-rich syngas production via methane partial oxidation

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Tahani Saad Algarni,
  • Yuvrajsinh B. Rajput,
  • Saba M. Alwan,
  • Omalsad H. Odhah,
  • Mohammed O. Bayazed,
  • Ahmed A. Ibrahim,
  • Alaaddin M. M. Saeed,
  • Rawesh Kumar,
  • Ahmed S. Al-Fatesh

摘要

The partial oxidation of methane into syngas may protect the environment by consuming potential greenhouse gas, CH4, and yield hydrogen-rich synthetic feedstock to industries. Herein, in the target of developing POM catalyst, silica-zirconia (SZ) is used as support, 5 wt.% Ni as an active metal site and 0.25–1 wt.% Ga as a promoter. Catalysts are characterized by X-ray diffraction study, surface area-porosity, Raman spectroscopy, thermogravimetry, and temperature-programmed reduction–oxidation-reduction cyclic experiments. The Ga-promoted Ni-based catalysts attain a higher concentration of “strongly interacted reducible NiO” than “weakly interacted reducible NiO” in the presence of oxygen and hydrogen. 0.25 wt.% Ga-promoted 5Ni/SZ attains the initial highest concentration of “strongly interacted reducible NiO,” its concentration remains higher even against the molecular oxygen. 5Ni0.25 Ga/SZ catalyzes 51% CH4 to yield 50% H2 (H2/CO = 2.5) through POM, whereas a 35% CO2 yield is also noticed through parallel participation of the TOM reaction. 675 °C reaction temperature, 8000 ccg⁻1 h⁻1 gas hourly space velocity, and 1.50 CH4/O2 ratio are set over 5Ni0.25 Ga/YZ by statistically predicted models like response surface methodology under center composite design. Under these predicted conditions, 83% CH4 conversion, 81% H2 yield, and 2.5 H2/CO ratio are constantly obtained up to 30 h on stream. Such a high catalytic activity on optimized reaction conditions makes 5Ni0.25 Ga/YZ a highly potent catalyst in achieving the hydrogen energy goal at the expense of CH4 depletion.

Graphical Abstract