Reduction potential and oxidation catalysis of vanadium-containing H_6+xP₂Mo_18−xV_xO₆₂ Wells-Dawson heteropolyacid (HPA) catalysts

Authors: Park, Dong Ryul; Kim, Heesoo; Jung, Ji Chul; Lee, Sang Hee; Song, In Kyu

Source: Research on Chemical Intermediates, Volume 34, Numbers 8-9, 2008 , pp. 845-851(7)

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Abstract:

Vanadium-containing H_6+xP₂Mo_18−xV_xO₆₂ (x = 0-3) Wells-Dawson heteropolyacid (HPA) catalysts were prepared. The successful formation of the Wells-Dawson HPAs was confirmed by FT-IR and ICP-AES analyses. The reduction potential of the H_6+xP₂Mo_18-xV_xO₆₂ (x = 0-3) catalysts was determined by temperature-programmed reduction measurements. The Wells-Dawson HPA catalysts were applied to the vapor-phase oxidation of methacrolein and benzyl alcohol. The reduction potential, conversion of methacrolein, and conversion of benzyl alcohol showed volcano-shaped curves with respect to vanadium substitution, and decreased in the order of H₈P₂Mo₁₆V₂O₆₂ > H₇P₂Mo₁₇V₁O₆₂ > H₉P₂Mo₁₅V₃O₆₂ > H₆P₂Mo₁₈O₆₂. A correlation between reduction potential and catalytic activity clearly showed that the conversion was monotonically increased with increasing reduction potential of the HPA catalyst in both oxidation reactions.

Keywords: WELLS-DAWSON HETEROPOLYACID; REDUCTION POTENTIAL; OXIDATION CATALYSIS

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156856708786189311

Affiliations: 1: School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Shinlim-dong, Kwanak-ku, Seoul 151-744, South Korea

Publication date: 2008-10-01