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Effects of cations, anions and H+ concentration of acidic ionic liquids on the valorization of polysaccharides into furfural

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Abstract

The valorization of hemicellulose into valuable chemicals, such as C5 sugars and furfural, in a one-pot fashion is crucial. In this work, acidic ionic liquids in the presence of water showed high yields of C5 sugars (>80%) with >99% conversion of hemicelluloses at 160 °C. With a water + toluene biphasic solvent system, within 4 h, an 85% furfural yield was obtained directly from hemicellulose in a one-pot fashion using a catalytic amount of 1-methyl-3-(3-sulfopropyl)-imidazolium hydrogen sulfate. It was seen that Brønsted acidic ionic liquids (BAILs) perform better than solid acid [Faujasite and Mordenite zeolites; ion exchange resin, Amberlyst-15] and mineral catalysts [HCl and H2SO4]. The higher activity of BAILs compared to solid acids and mineral acids was correlated to the Hammett acidity function (Ho) and ion-dipole type of interactions. The catalysts were characterized using NMR (1H and 13C), elemental analysis and TGA to confirm that they were stable under reaction conditions and were thus recyclable.

Graphical abstract: Effects of cations, anions and H+ concentration of acidic ionic liquids on the valorization of polysaccharides into furfural

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Publication details

The article was received on 28 Jan 2017, accepted on 25 May 2017 and first published on 29 May 2017


Article type: Paper
DOI: 10.1039/C7NJ00342K
Citation: New J. Chem., 2017, Advance Article
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    Effects of cations, anions and H+ concentration of acidic ionic liquids on the valorization of polysaccharides into furfural

    B. M. Matsagar and P. L. Dhepe, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ00342K

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