Electron spin resonance studies of free and supported 12-heteropoly acids. Part 2.—Reduction of H3[PMo12O40]·xH2O and H4[SiMo12O40]·xH2O and oxygen adsorption
- 1 January 1986
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 82 (2) , 273-280
- https://doi.org/10.1039/f19868200273
Abstract
Hydrogen and carbon monoxide reductions of SiMo12 and PMo12 heteropoly acids (HPA) have been studied, the various Mo5+ signals detected being identified as arising from stages in the dehydration and destruction of the HPA in a similar manner to vacuum heat treatment. Oxygen adsorption studies revealed the formation of O– 2 radicals on the supported HPA, prereduced at high temperatures, a phase in which the Keggin structure is already destroyed. In contrast, HPA in which the Keggin structure is preserved proved unable to stabilise O– 2 species. The stability of the supported HPA was shown to be markedly dependent on the nature of the support.Keywords
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