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Oxidative coupling of methane by Mn-Na2WO4/γ-Al2O3 catalyst: effect of Mn/W ratio

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Abstract

In this study, Mn-Na2WO4/γ-Al2O3 catalysts with varying ratios of Mn/W were prepared using the dry impregnation method. These catalysts were then tested for their suitability in the oxidative coupling of methane reaction. The X-ray photoelectron results revealed the presence of the tetrahedral WO42− phase in all prepared catalysts. It is believed that the presence of this phase is associated with high catalyst activity, indicating the potential of the catalysts for the desired reaction. The activity results show that the catalyst with a high Mn/W ratio exhibited higher activity at 800 °C, whereas the catalyst with a low Mn/W ratio showed greater activity at 850 °C. This suggests that the Mn/W ratio influences the reaction temperature at which the catalyst is most active. Furthermore, the X-ray diffraction results of the treated catalysts revealed that the catalyst with a high Mn/W ratio exhibited more MnAl2O4 at 800 °C, whereas the catalyst with a low Mn/W ratio contained more MnWO4 at 850 °C. The results suggest that the presence of MnAl2O4 sites may promote a more facile Mn2+ ↔ Mn3+ cycle at lower temperatures than the MnWO4 site, potentially contributing to the enhanced catalyst activity in the oxidative coupling of methane reaction at 800 °C.

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Acknowledgements

The authors of this work appreciate the financial support of the Ferdowsi University of Mashhad Research Council, Mashhad, Iran (Grant No. 68841) and (OCM project No. 23346).

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  1. Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, 9177948974, Iran

    Hasan Oliaei Torshizi, Ali Nakhaei Pour, Alireza Salimi & Melika Ghadamyari

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  1. Hasan Oliaei Torshizi
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  2. Ali Nakhaei Pour
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Correspondence to Ali Nakhaei Pour.

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Torshizi, H.O., Pour, A.N., Salimi, A. et al. Oxidative coupling of methane by Mn-Na2WO4/γ-Al2O3 catalyst: effect of Mn/W ratio. Front. Chem. Sci. Eng. 18, 1 (2024). https://doi.org/10.1007/s11705-023-2367-z

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