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采用溶胶凝胶法制备了一系列硅胶负载型离子液体催化剂(IL/sg),并成功应用于甲醛与苯乙烯及其衍生物的Prins反应中.利用红外光谱(FT-IR)、元素分析(EA)和氮气吸附-脱附等对催化剂结构进行了表征.研究表明,磺酸功能化离子液体1-甲基-3-丁磺酸基咪唑硫酸氢盐固载得到的负载型催化剂(Bs MIm HSO4/sg)表现出最佳的催化活性.在催化剂投料量为烯烃的3%,甲醛与烯烃摩尔比为4∶1,80℃下反应8 h,苯乙烯转化率达到了100%,产物选择性为90%.催化剂经简单的过滤分离后重复使用5次,仍保持良好的催化活性.此外,该催化体系具有较好的底物适用性.
A series of silica-supported ionic liquid catalysts (IL / sg) were prepared by sol-gel method and were successfully applied to the Prins reaction of formaldehyde with styrene and its derivatives.Using infrared spectroscopy (FT-IR), elemental analysis EA) and nitrogen adsorption-desorption were used to characterize the structure of the catalyst.The results showed that the supported catalyst supported by 1-methyl-3-butanesulfonylimidazolium bisulfate (Bs MIm HSO4 / sg) showed the best catalytic activity.When the amount of catalyst was 3%, the molar ratio of formaldehyde to olefin was 4:1, reaction temperature was 80 ℃ for 8 h, the conversion of styrene reached 100% The property is 90% .The catalyst has been reused 5 times by simple filtration and separation, and still retains good catalytic activity.In addition, the catalytic system has better substrate suitability.