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Synthesis of vanillin in water by TiO2 photocatalysis

Paper ID Volume ID Publish Year Pages File Format Full-Text
46506 46440 2012 7 PDF Available
Title
Synthesis of vanillin in water by TiO2 photocatalysis
Abstract

The photoproduction of vanillin is studied in aqueous medium starting from trans-ferulic acid, isoeugenol, eugenol or vanillyl alcohol by using both commercial and home prepared TiO2 samples as photocatalysts and batch Pyrex photoreactors. The photo-oxidation at room temperature of these compounds produces vanillin with a selectivity ranging from 1.4 to 21 mol% with respect to the converted substrate. An investigation on the intermediates was performed in the case of trans-ferulic acid; for this substrate the most important intermediates were homovanillic acid, vanillyl mandelic acid, trans-caffeic acid, formic acid, acetic acid, and oxalic acid. The carbon mass balance, including CO2 derived from the mineralization, was made for all of the substrates at irradiation times corresponding to the highest selectivity to vanillin. High closure of the carbon balance was obtained with vanillyl alcohol (ca. 90%) and trans-ferulic acid (ca. 80%).

Graphical abstractThe photoproduction of vanillin is reported in aqueous medium starting from trans-ferulic acid, isoeugenol, eugenol or vanillyl alcohol by using both commercial and home prepared TiO2 samples as the photocatalysts and batch photoreactors. Crystals of vanillin were obtained by pervaporation under ambient temperature with a high degree of purity.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Photocatalytic synthesis of vanillin. ► Trans-ferulic acid, isoeugenol, eugenol, vanillyl alcohol, used as substrates. ► Commercial and home prepared TiO2 samples for partial photo-oxidation.

Keywords
Titanium dioxide; Photocatalysis; Vanillin; Partial oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 111–112, 12 January 2012, Pages 555–561
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