ISSN:
1572-879X
Keywords:
heteropolyacid supported on silica
;
methanol oxidation
;
Keggin anion transformations at silica surface
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Properties of H5PV2Mo10O40 (HPVMo) heteropolyacid supported on high area silica (375 m2 g−1) were investigated. At low loadings interaction with surface OH groups leads to hydrolysis of Keggin anions into “triads” of edge-sharing octahedra strongly bound to the surface. Characteristic acidity is lost and methanol is oxidized to formaldehyde. At high loading unperturbed Keggin anions are present at the surface. Properties resemble those of unsupported acid. Thermally decomposed Keggin anions become reconstructed under exposure to water vapor. Dimethylether is mainly formed from methanol.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00816303
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