Production of 5-Hydroxymethylfurfural from Glucose by Recyclable Heteropolyacid Catalyst in Ionic Liquid

In this study, heteropolyacid catalyst (SiO2-ATS-PTA) was prepared by using silica as a supporter to convert glucose to 5-hydroxymethylfurfural (HMF). The structure and mor-phology of catalyst was characterized by ESEM, XPS, and Raman. The prepared SiO2-ATS-PTA was used in the conversion of glucose into HMF with 1-ethyl-3-methylimidazolium chloride ([Emim]Cl) ionic liquid as solvent via the oil bath. The effect of the reaction time, temperature and catalyst dosage on the glucose conversion, HMF yield, and HMF selectivity was investigated. The highest HMF yield of 74.67% was obtained from glucose at 140 C, 180 min, and 70 mg of catalyst. Furthermore, the reusability of the SiO2-ATS-PTA and ionic liquid was examined for 3 consecutive cycles. The results showed that the glucose conversion, HMF yield, and HMF selectivity only decrease by 4.63%, 4.74%, and 4.85%, respectively, after three times reused. This study puts forward SiO2-ATS-PTA as a recyclable heteropolyacid catalyst for the conversion of glucose to HMF, indicating a favorable application in the biorefinery.(c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).