AMMOXIDATION OF METHYLPYRAZINE OVER BINARY OXIDE SYSTEMS .2. THE STUDY OF PHYSICOCHEMICAL PROPERTIES AND ACTIVE COMPONENT OF THE VANADIUM-ANTIMONY SYSTEM

The phase composition and state of the vanadium cations in the vanadiu m-antimony catalysts of different compositions before and after the re action of methylpyrazine ammoxidation were studied by XRD, IR, ESR, an d V-51 NMR. Vanadium antimonate had the lowest selectivity in the seri es of binary compositions. At Sb/V > 1, a solid solution of the tetrah edrally coordinated V5+ ions in Sb6O13 was the most selective, and at Sb/V < 1, the vanadium pentoxide was the active component.