Issue 11, 1986

Electron spin resonance studies of free and supported 12-heteropoly acids. Part 4.—The reduction of H3+n(PVnMo12–nO40xH2O and the influence of supports on their properties

Abstract

The reduction of PVnMo12–n heteropoly acids (HPA) with n= 1–3 has been studied, and a sequence of V4+ e.s.r. signals obtained is described. The main signal is a single symmetric line of 150–300 G width originating from interacting metal atoms. Although the vanadium ion is much more easily reduced, at high reduction temperatures an Mo5+ signal originating from the destroyed Keggin anion is additionally observed. The destruction of the Keggin anion structure is increased when loading the HPA on a support, which simultaneously improves the conditions for the formation of O2 oxygen radicals. On alumina the typical properties of HPA were shown to change, as observed by e.s.r. spectroscopy.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans. 1, 1986,82, 3491-3499

Electron spin resonance studies of free and supported 12-heteropoly acids. Part 4.—The reduction of H3+n(PVnMo12–nO40xH2O and the influence of supports on their properties

R. Fricke, H. Jerschkewitz and G. Öhlmann, J. Chem. Soc., Faraday Trans. 1, 1986, 82, 3491 DOI: 10.1039/F19868203491

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