Journal
FUEL
Volume 324, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.124678
Keywords
Cellulose; 5-Hydroxymethylfurfural; Molten Salt Hydrate; Biphasic System; Selective Conversion
Categories
Funding
- National Key Research and Devel-opment Project [2018YFB1501402]
- National Natural Science Foundation of China [51906072]
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5-hydroxymethylfurfural (5-HMF) is an important biomass-derived fuel precursor that can be efficiently converted from fructose in a biphasic system of LiBr hydrate/acetone. By adjusting Lewis acidity with AlCl3, a high yield of 5-HMF and glucose was directly produced from cellulose, achieving a promising carbon balance of 88.8%. Adsorption of 5-HMF from solvent via hyper-cross-linked polymer allows for efficient recycling of the product and the reaction system can be reused multiple times without losing selectivity.
5-hydroxymethylfurfural (5-HMF) is a crucial biomss-derived fuel precursor with versatile conversion pathways to advanced fuels. However, direct production of 5-HMF from crystalline cellulose is critical challenging due to the inefficient deconstruction of recalcitrant cellulose structure. Molten salt hydrates (MSHs) are unique in cellulose deconstruction and dissolution. In this work, a biphasic system of LiBr hydrate/acetone was established. It was found that 93.4% yield of 5-HMF can be efficiently converted from fructose without any catalysts. With the addition of AlCl3 to adjust Lewis acidity, an enhanced 5-HMF yield of 75.1% together with 13.7% of glucose were directly produced from cellulose, showing a promising carbon balance of 88.8%. A proposed mechanism for cellulose conversion was studied by density functional theory (DFT) calculations, demonstrating that the isomerization of glucose to fructose rather than crystalline cellulose hydrolysis was the rate-determining step. After reaction, the formed 5-HMF can be efficiently recycled from solvent via hyper-cross-linked polymer adsorption and the reaction system can be recycled for more than 5 times without reducing 5-HMF selectivity.
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