Effects of Center Atom (P,As) in Heteropolymolybdate on Catalytic Oxidation

Abstract

Abstract: The heteropolymolybdates of Keggin structural anion with different center atoms, M₃(XMo₁₂O₄₀) in which M=K⁺, NH₄⁺; X=P, As, were synthesized. Their redox and acidic proper-ties were examined by means of FTIR, ESR, TPD, and cyclic voltammetry techniques. Based on a comparison of heteropolymolybdate of both kinds of center atom(P, As), we found that the one con-tainning As atom is easier reducible and possesses lower acid strength. As a result, the catalyst con-tainning As anion is less active for the oxidative dehydrogenation of isobutylaldehyde, however, is more selective for the formation of methacrylic acid. These effects of center atom in heteropolyacid salt on the oxidative dehydrogenation activity and the oxidation selectivity may be related to the increasing of oxidation-redaction potential and facility of donating bridged oxygen of the As anion.

Key words: Heteropolymolybdate, Catalysis, Oxidation

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Wang Guojla, Hu Ji, Yang Hongmao, Wu Tonghao, Jiang Yuzi, Zhen Kaiji . Effects of Center Atom (P,As) in Heteropolymolybdate on Catalytic Oxidation[J]. Chem. J. Chinese Universities, 1990, 11(11): 1249.

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Effects of Center Atom (P,As) in Heteropolymolybdate on Catalytic Oxidation

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