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Investigation of the Mechanisms Underpinning Plasma-Catalyst Interaction for the Conversion of Methane to Oxygenates

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Abstract

Plasma catalysis is a promising approach to further enhance the conversion of methane into value-added products such as methanol. In this work, the mechanisms enabling the conversion of methane to CO, CO2 and methanol enabled by plasma-enhanced catalysis were investigated. A catalyst reactor was incorporated downstream of the plasma jet to enable the separation between plasma generation and the catalyst bed. An enhancement in CH3OH and CO2 production was observed for the shortest distance between the plasma and catalyst compared to the plasma-only case. Plasma-enabled gas heating was shown not to be responsible for the observed synergy while a gas temperature increase as low as 30–40 K significantly impacted desorption rates of CH3OH/C2H5OH on alumina particles. Correlations between molecular beam mass spectrometry (MBMS) measurements at the inlet and outlet of the catalytic reactor suggest that the observed synergistic effect was caused by radical species most likely the CH3O2 radical. This study shows that surface reactions induced by radicals such as alkylperoxy radicals might play an important role in surface reactions in plasma-catalysis.

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Acknowledgements

This material is based upon work supported by the National Science Foundation (CBET 1703439). The work has significantly benefited from methods and techniques developed in the framework of work supported by the US Department of Energy, Office of Science, Office of Fusion Energy Sciences General Plasma Science program under Award Number DE-SC0020232 and DE-SC0001939.

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  1. Department of Mechanical Engineering, University of Minnesota, 111 Church Street SE, Minneapolis, Minnesota, 55414, USA

    Jingkai Jiang & Peter J. Bruggeman

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  1. Jingkai Jiang
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  2. Peter J. Bruggeman
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Correspondence to Peter J. Bruggeman.

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Jiang, J., Bruggeman, P.J. Investigation of the Mechanisms Underpinning Plasma-Catalyst Interaction for the Conversion of Methane to Oxygenates. Plasma Chem Plasma Process 42, 689–707 (2022). https://doi.org/10.1007/s11090-022-10251-5

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  • DOI: https://doi.org/10.1007/s11090-022-10251-5

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