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Catalytic conversion of hemicellulosic biomass to lactic acid in pH neutral aqueous phase media

Paper ID Volume ID Publish Year Pages File Format Full-Text
45631 46418 2015 9 PDF Available
Title
Catalytic conversion of hemicellulosic biomass to lactic acid in pH neutral aqueous phase media
Abstract

•The conversion of xylose and xylan to lactic acid with a ZrO2 catalyst was first reported.•Acid/base bifunctionality of ZrO2 promotes retro-aldol condensation of xylose.•This aqueous-phase process enhances the sustainability of chemical production.

The conversion of lignocellulosic biomass into value-added chemicals using non-toxic heterogeneous catalysts and water as solvent is an attractive green process. Biomass-derived lactic acid is an important renewable chemical building block for synthesizing commodity chemicals, e.g. biodegradable plastics. This paper reports that hemicellulosic biomass, xylan and xylose, can be converted to lactic acid over a ZrO2 catalyst starting from pH neutral aqueous solutions. The effects of reaction conditions, including temperature, oxygen partial pressure, biomass loading, and catalyst loading, etc., on the conversions of hemicellulosic biomass and the corresponding yields of lactic acid have been investigated. Molar yields of lactic acid, up to 42% and 30% were produced from xylose and xylan, respectively, under the investigated reaction conditions and with the ZrO2 catalyst. The key intermediates such as glyceraldehyde, glycolaldehyde and pyruvaldehyde were used as the reactants to probe the reaction mechanism. The role of the ZrO2 catalyst in the retro-aldol condensation of xylose, as well as the catalyst stability, has been discussed.

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Keywords
Biomass; Hemicellulose; Lactic acid; Zirconia; Aqueous phase catalysis
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Catalytic conversion of hemicellulosic biomass to lactic acid in pH neutral aqueous phase media
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 162, January 2015, Pages 149–157
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