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Reduction potentials of H3+xPMo12–xVxO40 and H6+xP2Mo18−xVxO62 heteropolyacid (HPA) catalysts and their catalytic activity for the vapor-phase oxidative dehydrogenation of isobutyric acid

Paper ID Volume ID Publish Year Pages File Format Full-Text
52353 46870 2008 6 PDF Available
Title
Reduction potentials of H3+xPMo12–xVxO40 and H6+xP2Mo18−xVxO62 heteropolyacid (HPA) catalysts and their catalytic activity for the vapor-phase oxidative dehydrogenation of isobutyric acid
Abstract

Vanadium-containing H6+xP2Mo18−xVxO62 (x = 0, 1, 2, and 3) Wells-Dawson heteropolyacid (HPA) catalysts were prepared for use in the oxidative dehydrogenation of isobutyric acid (IBA) to methacrylic acid (MAA). Vanadium-containing H3+xPMo12−xVxO40 (x = 0, 1, 2, and 3) Keggin HPA catalysts were also investigated for the purpose of comparison. The reduction potentials of H3+xPMo12−xVxO40 and H6+xP2Mo18−xVxO62 catalysts were determined by temperature-programmed reduction (TPR) measurements. The reduction potentials of H3+xPMo12−xVxO40 and H6+xP2Mo18−xVxO62 catalysts showed volcano-shaped curves and exhibited the same trend with respect to vanadium substitution. The conversions of IBA over H3+xPMo12−xVxO40 and H6+xP2Mo18−xVxO62 catalysts also showed volcano-shaped curves and exhibited the same trend with respect to vanadium substitution. However, the H6+xP2Mo18−xVxO62 catalysts showed a higher reduction potential and a higher conversion of IBA than the H3+xPMo12−xVxO40 catalysts at the same level of vanadium substitution. A correlation between reduction potential and catalytic activity of the HPA catalysts clearly demonstrated that the conversion of IBA increased monotonically with increasing reduction potential of the HPA catalysts, across both families of vanadium-containing HPA catalysts examined in this work.

Keywords
Vanadium-containing heteropolyacid catalyst; Wells-Dawson; Keggin; Oxidative dehydrogenation; Isobutyric acid; Oxidation catalysis
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Reduction potentials of H3+xPMo12–xVxO40 and H6+xP2Mo18−xVxO62 heteropolyacid (HPA) catalysts and their catalytic activity for the vapor-phase oxidative dehydrogenation of isobutyric acid
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 9, Issue 2, February 2008, Pages 293–298
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us