Abstract: Brönsted acidic ionic liquid N-methyl pyrrolidonium hydrosulfate ([hnmp]HSO₄) was immobilized in silica gel by sol-gel method. The silica-gel-supported ionic liquid catalyst (SILC) was used as a new kind of cheap and accessible catalyst in esterification reactions. Without dehydrant，the yield of butyl acetate reaches to 69 %，and the turnover frequency (TOF) is 1350 h^－1. After the SILC was recycled for 8 times，the ester yield of the reaction was basically similar to that obtained with the freshly prepared catalyst. According to the analysis of TG-IR，about 7 % ionic liquid was strongly adsorbed in silica-gel. The products separation using SILC was convenient. It is presumed that the SILC can be used in the fixed-bed process.

摘要： 由溶胶-凝胶法负载BrÖnsted酸性离子液体N-甲基吡咯烷酮硫酸氢盐（[hnmp]HSO₄），得到硅胶负载离子液体（SILC）。用SILC作为催化剂，研究了一系列醇酸的酯化反应，在没有带水剂存在下，最高酯收率可以达到69%，TOF可以达到1350 h^-1。催化剂重复使用8次未见活性明显降低，具有较好的重复使用性。分析结果表明，离子液体已较好地负载于硅胶上，其中约7%的离子液体与硅胶结合紧密牢固。负载离子液体催化剂的用量明显比纯离子液体催化剂的用量少，有效降低了催化剂成本，有望在固定床反应器中使用。