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Redox properties and oxidation catalysis of potassium salts of transition metal-substituted α2-K8P2W17O61(M·OH2) (M = MnII, ZnII, FeII, CoII, CuII, and NiII) Wells-Dawson heteropolyacids

Paper ID Volume ID Publish Year Pages File Format Full-Text
40958 45872 2012 6 PDF Available
Title
Redox properties and oxidation catalysis of potassium salts of transition metal-substituted α2-K8P2W17O61(M·OH2) (M = MnII, ZnII, FeII, CoII, CuII, and NiII) Wells-Dawson heteropolyacids
Abstract

Potassium salts of transition metal-substituted α2-K8P2W17O61(M·OH2) (M = MnII, ZnII, FeII, CoII, CuII, and NiII) Wells-Dawson heteropolyacids were prepared to investigate their redox properties and oxidation catalysis. Successful formation of α2-K8P2W17O61(M·OH2) catalysts was confirmed by FT-IR, 31P NMR, and ICP-AES measurements. Reduction potential and absorption edge energy of α2-K8P2W17O61(M·OH2) catalysts were determined by an electrochemical method and UV–vis spectroscopy in solution, respectively. Absorption edge energy of α2-K8P2W17O61(M·OH2) catalysts decreased with increasing reduction potential of the catalysts. It was also found that reduction potential of α2-K8P2W17O61(M·OH2) catalysts increased and absorption edge energy of the catalysts decreased with decreasing Tanaka electronegativity of substituted transition metal. Vapor-phase benzyl alcohol oxidation was also carried out as a model reaction in order to probe oxidation catalysis of α2-K8P2W17O61(M·OH2) catalysts. Yield for benzaldehyde increased with increasing reduction potential and with decreasing absorption edge energy of α2-K8P2W17O61(M·OH2) catalysts. Reduction potential and absorption edge energy of α2-K8P2W17O61(M·OH2) catalysts could be utilized as a probe of oxidation catalysis of the catalysts.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (146 K)Download as PowerPoint slideHighlights► α2-K8P2W17O61(M·OH2) heteropolyacids with different metals (M) were prepared. ► Reduction potentials were measured by an electrochemical method. ► Absorption edge energies were determined by UV–vis spectroscopy. ► Yield for benzaldehyde increased with increasing redox properties.

Keywords
Heteropolyacid; Transition metal; Reduction potential; Absorption edge energy; Oxidation catalysis
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Redox properties and oxidation catalysis of potassium salts of transition metal-substituted α2-K8P2W17O61(M·OH2) (M = MnII, ZnII, FeII, CoII, CuII, and NiII) Wells-Dawson heteropolyacids
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 427–428, 15 June 2012, Pages 79–84
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