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225 Production of furfural from xylose, water-insoluble hemicelluloses and water-soluble fraction of corncob via a tin-loaded montmorillonite solid acid catalyst

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This paper, written by researchers from South China University of Technology and others, discusses Production of furfural from xylose, water-insoluble hemicelluloses and water-soluble fraction of corncob via a tin-loaded montmorillonite solid acid catalyst. The paper is published in an important journal < Bioresource Technology>. IF:5.807.

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The conversion of xylose, water-insoluble hemicelluloses (WIH) and water-soluble fraction (WSF) of corncob to furfural was performed using montmorillonite with tin ions (Sn-MMT) containing double acid sites as a solid acid catalyst. The co-existence of Lewis acids and Brønsted acids in Sn-MMT was shown to improve the furfural yield and selectivity. 76.79% furfural yield and 82.45% furfural selectivity were obtained from xylose using Sn-MMT as a catalyst in a biphasic system with 2-s-butylphenol (SBP) as the organic extracting layer and dimethyl sulfoxide (DMSO) as the co-solvent in contact with an aqueous phase saturated with NaCl (SBP/NaCl-DMSO) at 180 C for 30 min. Furthermore, Sn-MMT also demonstrated the excellent catalytic performance in the conversion of pentose-rich materials of corncob and 39.56% and 54.15% furfural yields can be directly obtained from WIH and WSF in the SBP/NaCl-DMSO system, respectively.







The conversion of pentose-rich carbohydrate (xylose, WIH and WSF of corncob) to furfural was achieved using Sn-MMT as a solid acid catalyst in a SBP/NaCl-DMSO system. A highest furfural yield of 76.79% with the conversion efficiency of 93.13% and the furfural selectivity of 82.45% was obtained at 180 C for 30 min using xylose as the raw material. This catalyst also displayed stability after three recycling. Moreover, the furfural yields were achieved up to 39.56% and 54.15% for WIH and WSH, respectively. Future study will focus on the furfural production from corncob hydrolysate in biphasic systems in a two-step process.



The Application process of Xiang Hu instrument in this thesis

Initially, montmorillonite (2 g) was dispersed in DI water (98 mL) and intensely stirred for 30 min at room temperature, followed by standing for 24 h to make it fully swell. Then aq. SnCl4 5H2O (3.5 mmol, 10 mL) was added slowly. The mixture was treated at 85 C for 2 h under microwave irradiation (600 W, XH-300UL, Beijing Xiang-Hu Science and Technology Development Reagent Co., Ltd., China) at atmospheric pressure. The collected clay was washed with DI water until the washing water became neutral (pH = 7) and dried at 110 C over night.