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Chemical oscillations during the photoreduction of 1,4-benzoquinone in acidic bromate solution

Paper ID Volume ID Publish Year Pages File Format Full-Text
27889 44048 2007 7 PDF Available
Title
Chemical oscillations during the photoreduction of 1,4-benzoquinone in acidic bromate solution
Abstract

The photo-mediated bromate-1,4-benzoquinone reaction was investigated systematically as a function of light intensity, reaction temperature, and concentrations of 1,4-benzoquinone, bromate, and sulfuric acid. The parameter range within which the system exhibits spontaneous chemical oscillations has been determined. The observed oscillations could be temporarily quenched by adding bromide ions, but the addition of ethanol showed irreversible influences on the oscillatory phenomenon. Examinations with narrow band filters illustrate that incident light with the wavelength of around 450 nm, which overlaps with one of the absorption peaks of 1,4-benzoquinone, favors the oscillatory behavior. Numerical simulations confirm that the coupling of the photoreduction of 1,4-benzoquinone and the autocatalytic oxidation of 1,4-hydroquinone is responsible for the observed spontaneous oscillations.

Keywords
Photoreactions; 1,4-Benzoquinone; Chemical oscillations; Nonlinear feedbacks
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Chemical oscillations during the photoreduction of 1,4-benzoquinone in acidic bromate solution
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 192, Issues 2–3, 15 December 2007, Pages 204–210
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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
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Any Questions? feel free to contact us