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Vanillin oligomerization as a model of side reactions in lignin fragmentation

Paper ID Volume ID Publish Year Pages File Format Full-Text
55371 47049 2012 6 PDF Available
Title
Vanillin oligomerization as a model of side reactions in lignin fragmentation
Abstract

Vanillin (p-hydroxy, m-methoxybenzaldehyde) has been tested as a model molecule for the rearrangement of intermediate products of lignin fragmentation, an important step in the chemical valorisation of lignocellulosic biomass. The reactivity of vanillin has been studied in neutral aqueous media at 200 °C under controlled pressure of oxygen. The characterisation of hydrophobic and hydrophilic products by gas chromatography, size exclusion chromatography and FT-IR spectroscopy are provided. The presence of heterogeneous catalysts modifies conversion and selectivity of the oxidation reactions. The nature of the catalysts (nanosized Co3O4 and Mn3O4 and Pd/alumina) significantly affect the level of total oxidation as well as the nature and the yield of the products of mild oxidation. At moderate oxygen pressure, the main products are hydrophilic oligomers rich in free and bonded carboxylic groups. The products formed present similar structural features very similar to the products classically obtained in oxidative treatments of lignin. The results indicate that vanillin is a representative model molecule for studies of lignin valorisation.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (210 K)Download as PowerPoint slideHighlights► Vanillin conversion provides information on side reactions of lignin fragmentation. ► Hydrophilic oligomers are formed by vanillin mild oxidation in neutral aqueous media. ► Heterogeneous catalysts direct functionality and structure of vanillin oligomers.

Keywords
Lignin valorisation; Phenolics condensation; Aqueous oxidation; Oxide catalysts; Renewable resources
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Vanillin oligomerization as a model of side reactions in lignin fragmentation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 189, Issue 1, 30 July 2012, Pages 123–128
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