Catalytic conversion of sugarcane bagasse, rice husk and corncob in the presence of TiO2, ZrO2 and mixed-oxide TiO2-ZrO2 under hot compressed water (HCW) condition
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Author list: Chareonlimkun A., Champreda V., Shotipruk A., Laosiripojana N.
Publisher: Elsevier
Publication year: 2010
Journal: Bioresource Technology (0960-8524)
Volume number: 101
Issue number: 11
Start page: 4179
End page: 4186
Number of pages: 8
ISSN: 0960-8524
Languages: English-Great Britain (EN-GB)
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Abstract
The simultaneous hydrolysis/dehydration reaction of sugarcane bagasse, rice husk and corncob was studied under hot compressed water in the presence of TiO2, ZrO2 and TiO2-ZrO2 at 473-673 K. Among them, the reaction of corncob at 573 K in the presence of TiO2-ZrO2 produced the highest furfural and 5-hydroxymethylfurfural (HMF) yields (10.3% and 8.6%) with less by-products (i.e. glucose, fructose, xylose, and 1,6-anhydroglucose) selectivities. It was found that the catalyst preparation procedure and calcination temperature strongly affected its reactivity. Catalysts prepared by (co-) precipitation method gained higher reactivity than those prepared by sol-gel and physical mixing methods. The suitable calcination temperature for TiO2 and ZrO2 was at 773 K, whereas that for TiO2-ZrO2 was at 873 K; the XRD patterns revealed that different portions of phase formation were observed over catalysts with different calcination temperature. The portion of these phase formations affected the acidity-basicity of catalyst and thus the catalyst reactivity. ฉ 2010 Elsevier Ltd. All rights reserved.
Keywords
Furfural, TiO2-ZrO2
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