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Two routes for mineralizing benzene by TiO2-photocatalyzed reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
46729 46446 2011 9 PDF Available
Title
Two routes for mineralizing benzene by TiO2-photocatalyzed reaction
Abstract

When benzene was oxidized on TiO2-photocatalysts, muconaldehyde as well as phenol was identified as a product. Muconaldehyde was not produced from phenol, indicating that muconaldehyde and phenol are produced as initial stable intermediates by independent pathways. The amount of muconaldehyde produced in the reaction solution was low because it was rapidly oxidized on the photocatalyst. The contributions of the two pathways to the mineralization of benzene were analyzed by isotopic tracing methods using labeled benzene (13C6H6) and labeled phenol (13C6H5OH). The results showed that a larger part (60–70%) of benzene is initially converted to muconaldehyde. The percentage was dependent on the properties of TiO2 powders. It was also found that anatase-form powders show higher activity for oxidation of benzene than rutile powders do, whereas rutile-form powders show higher activity for oxidation of phenol than anatase powders do.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Muconaldehyde as well as phenol is an initial product produced from benzene in TiO2-photocatalyzed reaction. ► Benzene is mineralized on TiO2-photocatalyst by two parallel pathways via muconaldehyde and via phenol. ► Concentration of muconaldehyde produced is low because it is rapidly oxidized on TiO2 photocatalyst; in the initial stage of the reaction, most of CO2 is produced via muconaldehyde.

Keywords
TiO2 photocatalysis; Benzene; Muconaldehyde; Phenol; Ring-opening; Isotopic tracing method
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Two routes for mineralizing benzene by TiO2-photocatalyzed reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 107, Issues 1–2, 31 August 2011, Pages 119–127
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