ESR Study of Benzene-Oxidation on V-P-O/SiO2 Catalysts

Abstract

Abstract: The catalysts with the compositions (V₂O₅)₂₀(P₂O₅)_x(SiO₂)₁₀₀(0<x<60) were prepared by impregnation method. The catalytic properties of benzene oxidation on these samples were measured in a micro-reactor. The average oxidation numbers of V and the content of V⁴⁺ were determined by potassium permaganate titration and ESR, respectively. Thus the contents of V⁴⁺ and V³⁺ were calculated and the results were related to the catalytic property. It is found that the conversion of benzene and the selectivity to MA in the reaction were related closely to the total content of V⁵⁺ + V⁴⁺ and the content of V⁴⁺, respectively. By comparing the variation of the average oxidation numbers before and after reaction, we have come to the conclusion that the first attack to the aromatic ring is made by the lattice oxygen (double-boned).

Key words: V-P-O/SiO₂ Catalysts, ESR, Average oxidation number, Valance distribution, Benzen oxidafion

TrendMD:

Liu Jiageng, Ma Futai, Xu Yuanzhi. ESR Study of Benzene-Oxidation on V-P-O/SiO₂ Catalysts[J]. Chem. J. Chinese Universities, 1990, 11(6): 628.

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ESR Study of Benzene-Oxidation on V-P-O/SiO₂ Catalysts

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