NDLI: Redox Properties and Catalytic Oxidation Activities of Polyatom-Substituted H n PW11M1O40 (M = V, Nb, Ta, and W) Keggin Heteropolyacid Catalysts

Content Provider	Springer Nature Link
Author	Park, Dong Ryul Song, Sun Ho Hong, Ung Gi Seo, Jeong Gil Jung, Ji Chul Song, In Kyu
Copyright Year	2009
Abstract	Redox properties and catalytic oxidation activities of polyatom-substituted H n PW11M1O40 (M = V, Nb, Ta, and W) Keggin heteropolyacids (HPAs) were examined. Reduction potentials and UV–visible absorption edge energies of H n PW11M1O40 (M = V, Nb, Ta, and W) HPA catalysts in solution were determined by an electrochemical method and UV–visible spectroscopy measurements, respectively. It was observed that reduction potentials of H n PW11M1O40 (M = V, Nb, Ta, and W) HPA catalysts increased and UV–visible absorption edge energies of the HPA catalysts decreased with decreasing electronegativity of substituted polyatom. It was also found that the lower absorption edge energy corresponded to the higher reduction potential of the HPA catalyst. Vapor-phase oxidation of benzyl alcohol was carried out as a model reaction to probe the redox properties of H n PW11M1O40 (M = V, Nb, Ta, and W) HPA catalysts. Yield for benzaldehyde increased with increasing reduction potential and with decreasing absorption edge energy of the HPA catalyst, and in turn, with decreasing electronegativity of substituted polyatom. Reduction potential of H n PW11M1O40 (M = V, Nb, Ta, and W) HPA catalysts measured by an electrochemical method and absorption edge energy of the HPA catalysts measured by UV–visible spectroscopy could be utilized as a probe of oxidation catalysis of the HPA catalysts.
Starting Page	363
Ending Page	369
Page Count	7
File Format	PDF
ISSN	1011372X
Journal	Catalysis Letters
Volume Number	132
Issue Number	3-4
e-ISSN	1572879X
Language	English
Publisher	Springer US
Publisher Date	2009-07-28
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Heteropolyacid catalyst Polyatom substitution Reduction potential UV–visible absorption edge energy Oxidation of benzyl alcohol Pharmacy Industrial Chemistry/Chemical Engineering Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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