Preparation of 5-hydroxymethylfurfural from fructose using Brønsted acid catalyst

Tóm tắt

In the last two decades, ionic liquids have been emerging as green materials and attracted much attention from scientists due to their broad application in many fields such as catalysis, electrochemistry, and biomass conversion. 1-Methylimidazolium hydrogen sulfate and 1-(4-sulfonic acid) butyl-3-methylimidazolium hydrogen sulfate ([MimC₄SO₃H]HSO₄) were successfully prepared, and their chemical structures were elucidated by IR, HRMS. In this study, their catalytic activity was studied and compared with some inorganic catalysts through the preparation of fructose to 5- hydroxymethylfurfural (HMF) in the condition of stirring at room temperature. The result showed that among the tested catalysts for this reaction, [MimC₄SO₃H]HSO₄ was the best one with a yield of 86% after 24 hours. In addition, this Brønsted acid catalyst could be reused five times without significant loss of catalytic activity. Base on previous literature and our results, the plausible mechanism of fructose dehydration into HMF was proposed in this study.