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<p>The catalytic conversion of CH<sub>4</sub> by O<sub>2</sub> into syngas (known as partial oxidation of methane; POM) is a practical approach for depleting CH<sub>4</sub> concentration as well as achieving excellent H<sub>2</sub> yield with high H<sub>2</sub>/CO ratio. The pentasil zeolite family having different SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> ratios 10, 20, 25, and 30 (abbreviated as CBV10A, CBV20A, CP810E, and CBV3024E) is found to be an excellent carrier for Ni. These Ni-containing molecular sieves are investigated for POM and characterized by X-ray diffraction, Raman-infrared spectroscopy, thermogravimetry, temperature-programmed techniques, and transmission electron microscopy. 5Ni/CBV3024E catalyst has smaller number of active sites, 5Ni/CP810E contains unstable active site and mordenite-based Ni catalysts (5Ni/CBV10A and 5Ni/CBV20A) attain higher metal-support interaction. 5Ni/CBV20A outperforms others due to the presence of reducible NiO under moderate and strong interaction. It shows an initial 40% H<sub>2</sub> yield at 600 <sup>o</sup>C and 81% H<sub>2</sub> yield at 750 <sup>o</sup>C. The high-temperature POM reaction limits the H<sub>2</sub>/CO ratio close to the stoichiometric value of POM (~ 2), indicating the direct pathways of POM reaction at high temperatures. The high POM activity with the option of a wide range of H<sub>2</sub>/CO (4.12–2.26) using Ni-containing molecular sieve may gain industrial-level attention in the coming future.</p> Graphical abstract <p></p>

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The Role of Pore Architect, Reducibility and Silica-Alumina Ratio over Ni-Containing Molecular Sieves for Methane Partial Oxidation

  • 期刊论文

  • 发表日期：

    2025年1月21日

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  • Kirankumar J. Chaudhary,
  • Khaled M. Banabdwin,
  • Abdulaziz A. M. Abahussain,
  • Anis H. Fakeeha,
  • Irfan Wazeer,
  • Jehad K. Abu-Dahrieh,
  • Syed Ul Hasnain Bakhtiar,
  • Rawesh Kumar,
  • Ahmed S. Al-Fatesh

摘要

The catalytic conversion of CH4 by O2 into syngas (known as partial oxidation of methane; POM) is a practical approach for depleting CH4 concentration as well as achieving excellent H2 yield with high H2/CO ratio. The pentasil zeolite family having different SiO2/Al2O3 ratios 10, 20, 25, and 30 (abbreviated as CBV10A, CBV20A, CP810E, and CBV3024E) is found to be an excellent carrier for Ni. These Ni-containing molecular sieves are investigated for POM and characterized by X-ray diffraction, Raman-infrared spectroscopy, thermogravimetry, temperature-programmed techniques, and transmission electron microscopy. 5Ni/CBV3024E catalyst has smaller number of active sites, 5Ni/CP810E contains unstable active site and mordenite-based Ni catalysts (5Ni/CBV10A and 5Ni/CBV20A) attain higher metal-support interaction. 5Ni/CBV20A outperforms others due to the presence of reducible NiO under moderate and strong interaction. It shows an initial 40% H2 yield at 600 oC and 81% H2 yield at 750 oC. The high-temperature POM reaction limits the H2/CO ratio close to the stoichiometric value of POM (~ 2), indicating the direct pathways of POM reaction at high temperatures. The high POM activity with the option of a wide range of H2/CO (4.12–2.26) using Ni-containing molecular sieve may gain industrial-level attention in the coming future.

Graphical abstract