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<p>It is important to identify the reaction mechanism of methane interaction with metal oxide surfaces due to the involvement of this reaction in several important processes like the CLC and methane catalytic reforming by CO<sub>2</sub>. Therefore, the interaction of methane with magnesium oxide nanoparticles was monitored in this study by in situ DRIFT spectroscopy at a temperature ranging from 100 to 700&#xa0;°C. In addition, MgO nanoparticles were characterized by XRD, HRTEM, BET, and XPS to identify the nanoparticles’ structure, morphology, surface area, and surface composition, respectively, to correlate MgO properties with the DRIFTS results to specify the reaction mechanism of methane oxidation on MgO surfaces. The DRIFTS results indicate that the adsorption of methane molecules on the MgO nanoparticles starts as a methoxy group. Then, the reaction of the methoxy group with the oxygen of MgO results in the generation of di-oxymethylene ((MO)<sub>2</sub>-CH<sub>2</sub>) and MOH groups followed by a self-reaction of the di-oxymethylene molecules resulting in the formation of formate and methoxy groups. The interaction of methoxy with MgO lattice oxygen forms a bicarbonate group, which dissociates under the impact of the reaction temperature to carbon dioxide and water vapor.</p>

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Spectroscopic study of methane reaction mechanism on MgO nanoparticles

  • 期刊论文

  • 发表日期：

    2025年2月25日

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  • Alaa Hani Alminshid,
  • Hayder A. Alalwan,
  • Malik M. Mohammed,
  • Mohammed N. Abbas

摘要

It is important to identify the reaction mechanism of methane interaction with metal oxide surfaces due to the involvement of this reaction in several important processes like the CLC and methane catalytic reforming by CO2. Therefore, the interaction of methane with magnesium oxide nanoparticles was monitored in this study by in situ DRIFT spectroscopy at a temperature ranging from 100 to 700 °C. In addition, MgO nanoparticles were characterized by XRD, HRTEM, BET, and XPS to identify the nanoparticles’ structure, morphology, surface area, and surface composition, respectively, to correlate MgO properties with the DRIFTS results to specify the reaction mechanism of methane oxidation on MgO surfaces. The DRIFTS results indicate that the adsorption of methane molecules on the MgO nanoparticles starts as a methoxy group. Then, the reaction of the methoxy group with the oxygen of MgO results in the generation of di-oxymethylene ((MO)2-CH2) and MOH groups followed by a self-reaction of the di-oxymethylene molecules resulting in the formation of formate and methoxy groups. The interaction of methoxy with MgO lattice oxygen forms a bicarbonate group, which dissociates under the impact of the reaction temperature to carbon dioxide and water vapor.