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Catalytic hydrogenation of hemicellulosic sugars: reaction kinetics and influence of sugar structure on reaction rate

Authors :
Victoria Freitas
Ana Paez
Pascal Fongarland
Régis Philippe
Léa Vilcocq
Publication Year :
2023
Publisher :
American Chemical Society (ACS), 2023.

Abstract

Hemicelluloses are a major part of lignocellulosic biomass. Different sugars can be obtained from hemicelluloses: xylose, arabinose, galactose, mannose, glucose. Their catalytic hydrogenation produces polyols: xylitol, arabinitol, dulcitol, mannitol, sorbitol, which are valuable chemicals and platform molecules. In this paper, the hydrogenation of sugars was investigated with a Ru/TiO2 catalyst. The influence of temperature, pressure, xylose concentration and catalyst amount was studied for xylose hydrogenation and a Langmuir-Hinshelwood kinetic model was designed. The comparative study of five hemicellulose sugars showed a strong impact of sugar structure on hydrogenation rate: hexoses (glucose, mannose, galactose) react slower than pentoses (xylose, arabinose).

Details

Database :
OpenAIRE
Accession number :
edsair.doi.dedup.....f7b064dfe0bd36c41565538c7c10b3af
Full Text :
https://doi.org/10.26434/chemrxiv-2023-wpfkb