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Dried chitosan-gels as organocatalysts for the production of biomass-derived platform chemicals

Paper ID Volume ID Publish Year Pages File Format Full-Text
40714 45863 2012 7 PDF Available
Title
Dried chitosan-gels as organocatalysts for the production of biomass-derived platform chemicals
Abstract

Aldol condensations between sugar-derived dehydrated aldehydes (e.g. furfural) and acetone have been proposed as a route to provide useful biomass-derived chemicals. In the quest of sustainable catalytic ways for such aldol condensations, this paper assesses the use of dried chitosan-gels as naturally-immobilized, readily available and non-hazardous amino-based organocatalysts. At room temperature chitosan dried gels are not suitable catalysts for the desired reaction. However, at higher temperatures (>90 °C) reaction proceeds efficiently either in solvent-free systems (with addition of catalytic amounts of water) or in water. The set-up of closed reactor set-ups (thermoshakers or microwave reactions) proved highly beneficial for the reaction outcome. Furthermore, chitosan dried gels were successfully re-used for a number of cycles. An efficient catalyst drying method (either lyophilization or scCO2 drying) was crucial to achieve virtually full conversions in 4 h. After pertinent further process optimization, dried chitosan-gels may become very useful catalysts for their use in biomass-based reactions in biorefineries.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (173 K)Download as PowerPoint slideHighlights► Aldol condensation of furfural and acetone provides useful platform chemicals. ► Chitosan (presently a waste), catalyzes aldol condensation of furfural and acetone. ► Dried chitosan-gels lead to full conversions in 4 h under non-optimized conditions. ► As heterogeneous catalyst, recovery and reuse are straightforward. ► Worldwide available catalysts will be privileged in biorefineries.

Keywords
Chitosan; Aerogels; Furfural; Gasoline; Biofuels; Biorefineries
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Dried chitosan-gels as organocatalysts for the production of biomass-derived platform chemicals
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 445–446, 28 November 2012, Pages 180–186
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