NDLI: UV–visible spectroscopy as a probe of heteropolyacid redox properties: application to liquid phase oxidations

Content Provider	Springer Nature Link
Author	Barteau, K. P. Lyons, J. E. Song, I. K. Barteau, M. A.
Copyright Year	2006
Abstract	UV–visible spectra of heteropolyacids (HPAs) in solution were measured as a simple method of correlating and predicting the redox properties of HPAs. The range of Keggin-type HPAs included H$_{3}$PMo$_{12}$O$_{40}$, H$_{3}$PW$_{12}$O$_{40}$, and variations of cations, heteroatoms, and/or the framework metals. The absorption edges of 0.01 molar aqueous HPA solutions were determined and compared with absorption edges of solid HPAs and with results from other methods that probe redox properties. The absorption edges of the solutions followed similar trends to the absorption edges of bulk solid HPAs, NDR (negative differential resistance) peak voltages from STM measurements on HPA monolayers, and reduction potentials measured electrochemically. HPAs that are stronger oxidizing agents are characterized by absorption edges at longer wavelength (lower energy), and NDR peaks and reduction potentials at more positive voltages. Comparison of edge energies measured in aqueous solution with the performance of HPA catalysts for liquid phase oxidations demonstrates threshold behavior for oxidation activity in each case examined. These results illustrate the potential use of UV–visible spectroscopy in solution as a simple diagnostic indicator in the selection of HPAs as oxidation catalysts.
Starting Page	55
Ending Page	62
Page Count	8
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	41
Issue Number	1-4
e-ISSN	15729028
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2006-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	heteropolyacid polyoxometalate UV–visible spectroscopy reduction potential oxidation catalysis Physical Chemistry Industrial Chemistry/Chemical Engineering Catalysis Characterization and Evaluation Materials Pharmacy
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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