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Issue 17, 2009
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Partial oxidation of methanol on well-ordered V2O5(001)/Au(111) thin films

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Abstract

The partial oxidation of methanol to formaldehyde on well-ordered thin V2O5(001) films supported on Au(111) was studied. Temperature-programmed desorption shows that bulk-terminated surfaces are not reactive, whereas reduced surfaces produce formaldehyde. Formaldehyde desorption occurs between 400 K and 550 K, without evidence for reaction products other than formaldehyde and water. Scanning tunnelling microscopy shows that methanol forms methoxy groups on vanadyl oxygen vacancies. If methanol is adsorbed at low temperature, the available adsorption sites are only partly covered with methoxy groups after warming up to room temperature, whereas prolonged methanol dosing at room temperature leads to full coverage. In order to explain these findings we present a model that essentially comprises recombination of methoxy and hydrogen to methanol in competition with the reaction of two surface hydroxyl groups to form water.

Graphical abstract: Partial oxidation of methanol on well-ordered V2O5(001)/Au(111) thin films

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Publication details

The article was received on 15 Dec 2008, accepted on 17 Feb 2009 and first published on 11 Mar 2009


Article type: Paper
DOI: 10.1039/B822384J
Phys. Chem. Chem. Phys., 2009,11, 3290-3299

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    Partial oxidation of methanol on well-ordered V2O5(001)/Au(111) thin films

    J. M. Sturm, D. Göbke, H. Kuhlenbeck, J. Döbler, U. Reinhardt, M. V. Ganduglia-Pirovano, J. Sauer and H.-J. Freund, Phys. Chem. Chem. Phys., 2009, 11, 3290
    DOI: 10.1039/B822384J

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