Magnetic and optical studies of chromium oxides. Part 2.—Calcination of chromic chloride supported on alumina
- 1 January 1978
- 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. 74, 2017-2026
- https://doi.org/10.1039/f19787402017
Abstract
Magnetic and optical studies were made on chromium (III) chloride supported at various concentrations on a porous alumina, the impregnated samples having been calcined at different temperatures between 50–1150°C. The measurement of magnetic susceptibility and electron paramagnetic resonance spectra was carried out at controlled temperatures from –196 to 300°C. Optical reflectance spectra were obtained at room temperature on selected samples. The results suggest that clustering of the chromium chloride occurs, even in the lowest concentration studies (1.5 wt.% Cr); heat treatment in air leads to the formation of a mixed oxide phase containing CrVI, the stability of which is discussed in terms of electron transfer between the support and the chromium species.Keywords
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