The effect of the structure of molybdenum oxides on the selective oxidation of methanol

C. J. Machiels, W. H. Cheng, U. Chowdhry, W. E. Farneth, F. Hong, E. M. Mc Carron, A. W. Sleight

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Abstract

Selective oxidation of methanol to formaldehyde has been studied over a series of molybdates, molybdenum oxides, mixed tungsten - molybdenum oxides, and supported molybdenum oxide. Reactor studies, Temperature Programmed Reaction (TPR) and in-situ FTIR have shown that water and methanol adsorb dissociatively and reversibly on the same catalyst sites and that the rate determining step is the breaking of a carbon-hydrogen bond. The reaction is of a redox type and a nearly fully oxidized catalyst is most active and selective. The difference in activity between molybdenum trioxide and ferric molybdate can be explained by a mechanism in which formation of adsorbed methoxys does not occur on the predominant (010) face of MoO3. Oxide-support interactions are responsible for the lower selectivity of silica supported catalysts.

Original languageEnglish
Pages (from-to)249-256
Number of pages8
JournalApplied Catalysis
Volume25
Issue number1-2 C
DOIs
Publication statusPublished - 1986 Aug 15

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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