Abstract
The effect of sodium content on the dispersion of cobalt on the surface of γ-Al2O3 as well as on the type of cobalt species formed on it have been studied using diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, X-ray powder analysis, electron microscopy and thermo-programmed reduction; two series containing, respectively, 2.1 and 8.8 % Co have been investigated.The former series showed a marked increase in the dispersion of cobalt on the surface of the support, as revealed by X.p.s., when the sodium content increased from 2.3 to 5.7 %. In this composition range, a considerable transformation of Co3O4 into CoAl2O4, as well as a shift of the distribution of cobalt species from the homogeneous to heterogeneous, have been observed.In contrast, virtually no change was observed for the 8.8 % Co series throughout the sodium composition range.
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Schedule a callMore From: Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
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