Reusable and efficient polystyrene-supported acidic ionic liquid catalyst for esterifications
Reusable and efficient polystyrene-supported acidic ionic liquid catalyst for esterifications
复制标题
DOI：
10.1016/j.molcata.2010.09.011
复制
发表时间：
2010-11
影响因子：
--
通讯作者：
Zhen‐Zhen Xu;H. Wan;Jinmei Miao;Mingjuan Han;Cao Yang;G. Guan
中科院分区：
文献类型：
--
作者：
Zhen‐Zhen Xu;H. Wan;Jinmei Miao;Mingjuan Han;Cao Yang;G. Guan
将离子液体负载在高交联氯甲基化聚苯乙烯（PS- ch2cl）上，制备了聚苯乙烯（PS）负载型1-（丙基-3-磺酸盐）咪唑氢硫酸酯酸性离子液体（PS- ch2 -[SO3H-pIM][HSO4]）催化剂。采用FT-IR、SEM和TG-DSC对催化剂的结构和性能进行了表征。结果表明，酸性离子液体是通过共价键支撑在PS-CH2Cl表面的。PS-CH2Cl原本粗糙的表面被酸性离子液体覆盖，形成致密而薄的表面层，其尺寸没有明显变化。此外，PS-CH2-[SO3H-pIM][HSO4]催化剂表现出比PS-CH2Cl载体更好的热稳定性。对一系列酯化反应也表现出较高的催化活性。该催化剂重复使用13次合成乙酸正丁酯后，产率仅下降7.3%。并提出了在该催化剂上酯化反应的机理。
Polystyrene (PS)-supported 1-(propyl-3-sulfonate) imidazolium hydrosulfate acidic ionic liquid (PS-CH2-[SO3H-pIM][HSO4]) catalyst was prepared by supporting the ionic liquid onto highly cross-linked chloromethylated polystyrene (PS-CH2Cl). FT-IR, SEM and TG-DSC were employed to characterize the structure and property of the catalyst. Results suggested that acidic ionic liquid was supported onto the surface of PS-CH2Cl by covalent bond. The original rough surface of PS-CH2Cl was covered with acidic ionic liquid, forming a compact and thin surface layer, and its size had no obvious change. Moreover, the PS-CH2-[SO3H-pIM][HSO4] catalyst showed a better thermal stability than that of PS-CH2Cl support. It also exhibited high catalytic activity for a series of esterifications. After the catalyst was reused for 13 times in the synthesis of n-butyl acetate, the yield only decreased 7.3%. A reaction mechanism of esterification over this new catalyst was proposed as well.