Electrosynthesis of methanol from methane: The role of V2O5 in the reaction selectivity for methanol of a TiO2/RuO2/V2O5 gas diffusion electrode

Methane fed TiO2/RuO2/PTFE gas diffusion electrodes (GDEs) have been used for the electrosynthesis of methanol in 0.1molL−1 of Na2SO4 supporting electrolyte. By-products such as formaldehyde and formic acid are usually also formed during electrolyses, with the latter formed at a similar rate as that...

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Bibliographic Details
Published inElectrochimica acta Vol. 87; pp. 606 - 610
Main Authors Rocha, Robson S., Reis, Rafael M., Lanza, Marcos R.V., Bertazzoli, Rodnei
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.01.2013
Elsevier
Subjects
Chemistry
Electrochemistry
Electrodes
Electrosynthesis
Exact sciences and technology
Gas diffusion electrodes
General and physical chemistry
Methane
Methanol synthesis
Methyl alcohol
Polytetrafluoroethylenes
Ruthenium oxide
Selectivity
Thermally prepared oxide electrodes
Titanium dioxide
Vanadium pentoxide
Methane
Electrosynthesis
Thermally prepared oxide electrodes
Methanol synthesis
Gas diffusion electrodes
Titanium IV Oxides
Oxides
Gas electrode
Selectivity
Primary alcohol
Vanadium V Oxides
Preparation
Ruthenium IV Oxides
Electrochemical reaction
Chemical synthesis
Methanol
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Summary:Methane fed TiO2/RuO2/PTFE gas diffusion electrodes (GDEs) have been used for the electrosynthesis of methanol in 0.1molL−1 of Na2SO4 supporting electrolyte. By-products such as formaldehyde and formic acid are usually also formed during electrolyses, with the latter formed at a similar rate as that of methanol. In this study, V2O5 was added to the composition of the GDE to improve its selectivity for methanol. TiO2/RuO2/V2O5 powder hot-pressed with PTFE resulted in a GDE suitable for oxidative electrosynthesis with simultaneous oxygen evolution. By feeding the TiO2/RuO2/V2O5/PTFE GDE with methane, it was possible to enhance its selectivity for methanol at low values of current density. Furthermore, the formation of formic acid and formaldehyde was suppressed, allowing for higher current efficiencies. The addition of 5.6% of V2O5 increased the electrode's current efficiency to 57% at 2.0V, which is 2-fold higher than the efficiency achieved in the absence of vanadium oxide.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2012.09.113