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Issue 14, 2017
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Suppression of oligomer formation in glucose dehydration by CO2 and tetrahydrofuran

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Abstract

The transformation of readily available cellulosic biomass to small-molecule products is important in biorefining. To improve the economic viability, the formation of humins should be limited. Herein, we report the effective suppression of humin precursor (i.e., oligomer) formation in glucose-to-5-hydroxymethylfurfural (HMF) dehydration by the synergetic action of tetrahydrofuran (THF) and low-pressure CO2 (1.0 MPa). We show that four kinds of oligomers are formed in water, wherein the cross-condensation of HMF and levulinic acid (LA) generates oligomers (I) and (II), and the self-condensation of HMF generates oligomer (III), while the degradation of glucose/fructose generates oligomer (IV). In CO2-splitted triphasic H2O/THF (VH2O/VTHF = 1 : 1), the formation of oligomers (I) and (IV) is suppressed by CO2, while the formation of oligomers (I), (II), and (III) is inhibited by THF. This work highlights a strategy for increasing carbon utilization from glucose conversion by controlling the subreactions to favor the pathways towards the formation of small-molecule products.

Graphical abstract: Suppression of oligomer formation in glucose dehydration by CO2 and tetrahydrofuran

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Publication details

The article was received on 12 Apr 2017, accepted on 05 Jun 2017 and first published on 06 Jun 2017


Article type: Paper
DOI: 10.1039/C7GC01115F
Citation: Green Chem., 2017,19, 3334-3343
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    Suppression of oligomer formation in glucose dehydration by CO2 and tetrahydrofuran

    X. Fu, J. Dai, X. Guo, J. Tang, L. Zhu and C. Hu, Green Chem., 2017, 19, 3334
    DOI: 10.1039/C7GC01115F

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