Hydrolysis of eucalyptus wood chips under hot compressed water in the presence of sulfonated carbon-based catalysts
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Author list: Weerasai K., Champreda V., Sakdaronnarong C., Shotipruk A., Laosiripojana N.
Publisher: Elsevier
Publication year: 2018
Journal: Food and Bioproducts Processing (0960-3085)
Volume number: 110
Start page: 136
End page: 144
Number of pages: 9
ISSN: 0960-3085
Languages: English-Great Britain (EN-GB)
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Abstract
Hydrolysis of lignocellulosic biomass to sugars and derivatives is a key step in production of biofuels and commodity chemicals in a biorefinery. In this study, catalytic hydrolysis of eucalyptus chips with solid sulfonated carbon-based catalysts prepared from three different carbon precursors (sucrose, glucose, and xylose) was studied under hot-compressed water at 150–250 °C with reaction time of 1–10 min. Increasing temperature up to 200 °C led to higher sugar yields from cellulose and hemicellulose while further increase in temperature caused higher formation of sugar degradation by-products. Sulfonated-sucrose (SO3H-Suc) showed the greatest performance on sugar production compared to other catalysts with less formation of furans and anhydroglucose; its high catalytic activity was related to its high acid site density as proven by NH3-TPD measurement. Size reduction and chemical pretreatment of the biomass were found to enhance the hydrolysis yield and reaction selectivity. The highest sugar yield of 40.7% comprising glucose, fructose, and xylose was achieved using 5% (w/w) SO3H-Suc at 200 °C for 5 min with milled biomass (60–100 μm) pretreated by alkaline oxidation. The work provides an alternative catalytic process for hydrolysis of lignocellulose in biomass industry. © 2018 Institution of Chemical Engineers
Keywords
Solid acid catalyst
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