Реферат: Diffuse reflection electronic spectroscopy and ESR spectroscopy have been used in a study of the valence and coordination state of vanadium ions in vanadium-alumina and vanadium-magnesia catalytic systems that are effective in the oxidative dehydrogenation of hydrocarbons. On the surface ofγ-Al2O3, vanadium ions in octahedral coordination with the oxygen of the immediate surtoundings may be grouped primarily in clusters of 10–12 ions, providing stability of the V5+ ions against reduction to lower degrees of oxidation, and also providing easy reoxidizability of V4+ at ∼20°C. On the surface of MgO, the vanadium ion clusters that are formed are mostly small — two or three ions. Modification with KOH, K2SO4 and CdO tends to stabilize the V5+ under the reaction conditions in the oxidative dehydrogenation of ethylbenzene to styrene in the presence of nitrobenzene.

Библиографическая ссылка: Skrigan E.A. , Kupcha L.A. , Belomestnykh I.P. , Rozhdestvenskaya N.N. , Kozlov N.S. , Isagulyants G.V.
Relationships in formation of the active surface of vanadium-containing oxide systems for hydrocarbon dehydrogenation reactions in the presence of hydrogen acceptors
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 1991. V.40. N8. P.1562-1565. DOI: 10.1007/bf01172250 РИНЦ OpenAlex

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