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Received August 23, 2023
Accepted August 23, 2023
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Dehydration of D-xylose into furfural over H-zeolites

Division of Energy Systems Research and Division of Chemical Engineering and Materials Engineering, Ajou University, Wonchun-dong, Yeongtong-gu, Suwon 443-749, Korea 1R&D Center Kolon Industries, Inc, 294 Gajwa-dong, Seo-gu, Incheon 404-250, Korea
edpark@ajou.ac.kr
Korean Journal of Chemical Engineering, March 2011, 28(3), 710-716(7), 10.1007/s11814-010-0417-y
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Abstract

The liquid-phase dehydration of D-xylose into furfural was carried out over various H-zeolites-H-ferrierite, H-β, H-ZSM-5, H-Y and H-mordenite-with various SiO2/Al2O3 molar ratios in different solvent systems: water, dimethyl sulfoxide (DMSO) and a mixture of water and toluene (water/toluene). For comparison, γ-Al2O3 and silica-alumina were also examined. FT-IR spectroscopy after pyridine adsorption was conducted to probe the acidity of the H-zeolites._x000D_ The D-xylose conversion and furfural yield generally decreased with increasing SiO2/Al2O3 molar ratio over the Hzeolites having the same crystal structure irrespective of the kind of solvent system. This is closely related to the accessible acid sites. In a comparison study using the three different solvent systems, the D-xylose conversion and furfural selectivity generally decreased in the following order: water/toluene>DMSO>water. In water and water/toluene, H-β_x000D_ (25) showed the highest furfural selectivity at a similar D-xylose conversion among the tested zeolites. On the other hand, H-mordenite (20) showed the highest furfural selectivity at a similar D-xylose conversion in DMSO.

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