Indirect Electrooxidation of Methane to Methyl Bisulfate on a Boron-Doped 
Diamond Electrode

Britschgi, Joel; Bilke, Marius; Schuhmann, Wolfgang; Schüth, Ferdi

doi:10.1002/celc.202101253

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Indirect Electrooxidation of Methane to Methyl Bisulfate on a Boron-Doped Diamond Electrode

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Britschgi, Joel
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Bilke, Marius
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schüth, Ferdi
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Britschgi, J., Bilke, M., Schuhmann, W., & Schüth, F. (2022). Indirect Electrooxidation of Methane to Methyl Bisulfate on a Boron-Doped Diamond Electrode. ChemElectroChem, 9(1): e202101253. doi:10.1002/celc.202101253.

Cite as: https://hdl.handle.net/21.11116/0000-000A-2AB6-A

Abstract

Although highly desired and studied for decades, direct methane functionalization to liquid products remains a challenge. We report an electrochemical system using a boron-doped diamond (BDD) anode in concentrated sulfuric acid that is able to convert methane to methyl bisulfate and methanesulfonic acid without the use of a catalyst by indirect electrochemical oxidation. Due to its high material stability, BDD can be operated at high current densities. High temperature (140 °C) and pressure (70 bar) support the formation of methyl bisulfate to concentrations as high as 160 mM in 3 h and methanesulfonic acid to concentrations of up to 750 mM in 8 h. We present a novel way of catalyst-free electrochemical methane oxidation and show general trends and limitations of this reaction.