Microwave-assisted conversion of biomass derived hemicelluloses into xylo-oligosaccharides by novel sulfonated bamboo-based catalysts

• Sulfonated bamboo-based carbon (BCS) with active groups was synthesized.
• Microwave irradiation was adopted to increase the reaction efficiency.
• XOS with higher DP was preferentially obtained under mild conditions.
• Xylose and XOS with lower DP were preferentially obtained under severe conditions.
• Limited byproducts were detected in the hydrolysis reaction.

Hemicelluloses are the major constituent of biomass and their hydrolysis products xylo-oligosaccharides (XOS) are of great importance to the food, chemical and pharmaceutical industries. In this work, catalytic conversion of bamboo hemicelluloses into XOS was developed using novel solid acid catalysts of sulfonated bamboo-based carbon material (BCS). The Fourier Transform Infrared Spectroscopy characterization of BCS confirmed the successful introduction of acid groups (including –SO3H, –COOH and phenolic –OH) onto its surface. The effects of reaction temperature, residence time and solid acid-to-water ratio on the performance of catalytic conversion were investigated. The maximum XOS yield of 54.7 wt% based on xylan content was obtained at 150 °C for 45 min with a solid acid to water mass ratio of 1:200. The use of water solvent with BCS provides a green and efficient process for hemicellulose conversion.

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