Abstract
UV—VIS and electron spin resonance spectra were used to investigate the electronic structure of the vanadium—phosphate catalyst used in the selective oxidation of n-butane to maleic anhydride during its preparation as well as in the course of its interaction with oxygen and n-butane or with a mixture of these two substances. V 3+ and V 4+ were identified in the catalyst. It has been shown that V 3+ ions can act as electron donor (via the transition V 3+ → V 4+) during the adsorption of oxygen and thus participate in the catalytic oxidation of n-butane.
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