Development of a Heterogeneous Catalyst for Lignocellulosic Biomass Conversion: Glucose Dehydration by Metal Chlorides in a Silica-Supported Ionic Liquid Layer

摘要

An attempt is made to immobilize the homogeneous metal chlorlde/EMIMCl catalyst for glucose dehydration to 5-hydroxymethylfurfural. To this end, ionic liquid fragments were grafted to the surface of SBA-15 to generate a hetero-genized mimick of the homogeneous reaction medium. Despite a decrease in the surface area, the ordered mesopo-rous structure of SBA-15 was largely retained. Metal chlorides dispersed in such ionic liquid film are able to convert glucose to HMF with much higher yields as is possible in the aqueous phase. The reactivity order CrCl_2＞AlCl_3＞CuCl_2 ＞FeCl_3 is similar to the order in the ionic liquid solvent, yet the selectivity are lower. The HMF yield of the most promising CrCl_2-Im-SBA-15 can be improved by using a H_2O:DMSO mixture as the reaction medium and a 2-butanol/MIBK extraction layer. Different attempts to decrease metal chloride leaching by using different solvents are described.