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Redox properties and oxidation catalysis of group 5 metal (V, Nb, Ta)-containing Keggin and Wells–Dawson heteropolyacid (HPA) catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42243 45916 2010 7 PDF Available
Title
Redox properties and oxidation catalysis of group 5 metal (V, Nb, Ta)-containing Keggin and Wells–Dawson heteropolyacid (HPA) catalysts
Abstract

Group 5 metal-containing H4PW11M1O40 (M = V, Nb, Ta) Keggin heteropolyacids (HPAs) and H7P2W17M1O62 (M = V, Nb, Ta) Wells–Dawson HPAs were prepared in this work. Reduction potentials and UV–visible absorption edge energies of H4PW11M1O40 (M = V, Nb, Ta) and H7P2W17M1O62 (M = V, Nb, Ta) HPA catalysts in solution were measured by an electrochemical method and UV–visible spectroscopy, respectively. It was observed that reduction potentials of H4PW11M1O40 (M = V, Nb, Ta) and H7P2W17M1O62 (M = V, Nb, Ta) HPA catalysts increased with decreasing absorption edge energies of the HPA catalysts. In order to correlate the redox properties (reduction potential and absorption edge energy) with the oxidation catalysis of H4PW11M1O40 (M = V, Nb, Ta) and H7P2W17M1O62 (M = V, Nb, Ta) HPA catalysts, we carried out vapor-phase benzyl alcohol oxidation as a model reaction. Yield for benzaldehyde increased with increasing reduction potential and with decreasing absorption edge energy of the HPA catalysts. Reduction potentials of H4PW11M1O40 (M = V, Nb, Ta) and H7P2W17M1O62 (M = V, Nb, Ta) HPA catalysts measured by an electrochemical method and absorption edge energies of the HPA catalysts measured by UV–visible spectroscopy could be utilized as probes of oxidation catalysis of the HPA catalysts.

Graphical abstractReduction potentials and UV–visible absorption edge energies of H4PW11M1O40 (M = V, Nb, Ta) and H7P2W17M1O62 (M = V, Nb, Ta) HPA catalysts were measured. Vapor-phase benzyl alcohol oxidation was conducted as a model reaction to probe the redox properties of the HPA catalysts. The yield for benzaldehyde increased with increasing reduction potential and with decreasing absorption edge energy of the catalysts.Figure optionsDownload full-size imageDownload high-quality image (100 K)Download as PowerPoint slide

Keywords
Heteropolyacid catalyst; Group 5 metal substitution; Reduction potential; UV–visible absorption edge energy; Benzyl alcohol oxidation
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Redox properties and oxidation catalysis of group 5 metal (V, Nb, Ta)-containing Keggin and Wells–Dawson heteropolyacid (HPA) catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 373, Issues 1–2, 31 January 2010, Pages 201–207
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