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

TitlePartial oxidation of methanol on well-ordered V2O5(001)/Au(111) thin films
Publication TypeJournal Article
Year of Publication2009
AuthorsJ.M Sturm, D. Gobke, H. Kuhlenbeck, J. Dobler, U. Reinhardt, M.V Ganduglia-Pirovano, J. Sauer, H.J Freund
JournalPhysical Chemistry Chemical Physics
Volume11
Number17
Pagination3290-3299
Type of ArticleArticle
ISBN Number1463-9076
Accession NumberISI:000265195600035
Keywordsadsorption, AU(111), FORMALDEHYDE, REACTIVITY, REDUCTION, SINGLE-CRYSTAL SURFACES, TIO2(001), TIO2(110), V2O5, VANADIUM-OXIDE CATALYSTS
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.

URL<Go to ISI>://000265195600035
Division

nSI

Department

SIPC

PID

97a9d2cf7699615d4959dc8ed556edd7

Alternate TitlePhys. Chem. Chem. Phys.

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