摘要
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 gel supported ionic liquids catalysts（ IL / sg） has been successfully synthesized via solgel method and applied as catalyst for Prins reaction between formaldehyde with styrene and its derivatives. The structure of catalysts is characterized by various techniques including elemental analysis,FT-IR and nitrogen adsorption-desorption. The results show that silica gel supported 1-methyl-3-（ 3-sulfobutyl） imidazolium hydrogen sulfate（ Bs MIm HSO4/ sg） has the best catalytic activity with a performance of complete conversion of styrene and high selectivity（ 90%） of 4-phenyl-1,3-dioxane under conditions of n（ catalyst） ∶ n（ styrene） = 3%,n（ formaldehyde） ∶n（ styrene） = 4 ∶ 1,reaction temperature 80 ℃ and reaction time 8 h. The catalyst is able to be conveniently s eparated from the reaction system and maintain good catalytic activity after reused five times. In addition,the catalytic system has excellent substrate applicability.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2016年第3期199-206,共8页
Journal of Molecular Catalysis(China)
基金
国家自然科学基金项目(21473225)资助~~
