Abstract
The changes in reduction degree of V 2O 5MoO 3 catalysts occurring in the course of oxygen adsorption were investigated by electron spin resonance and chemical analysis. Two different types of paramagnetic centers, involving reduced vanadium ions stabilized by oxygen vacancies and substitutional Mo 6+ ions, have been found in partially reduced catalysts. The kinetics of oxidation of such catalysts investigated by electron spin resonance revealed a delay in oxidation of the centers stabilized by Mo 6+. The role of segregation processes occurring upon redox treatment of the V 2O 5MoO 3 catalysts in determination of the stability of particular centers has been discussed.
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