接枝SiO_2负载AlCl_3催化剂的性能研究

Performance Study of Loaded AlCl_3 on Grafted SiO_2

通过在SiO_2载体上接枝有机物以保护负载在催化剂表面的AlCl_3的方法,解决负载AlCl_3催化剂遇水失活的问题。通过偶联和接枝的手段,分别制备了仅有KH570偶联在SiO_2表面的载体和先偶联KH570再接枝甲基丙烯酸甲酯的SiO_2载体。将两载体和未接枝有机物的SiO_2载体分别负载AlCl_3制成催化剂,再分别用于叔丁基氯与苯的傅克烷基化反应。结果表明,在SiO_2表面偶联KH570后,催化剂耐水性明显提高,但如果接枝甲基丙烯酸甲酯使载体表面负载过多的有机物后,接枝的有机物将阻碍AlCl_3的负载和反应的进行。

In this paper, loaded AlCl_3 on grafted SiO_2 catalyst was prepared to solve the problem AlCl_3 inactivation in water. By means of coupling and grafting, we prepared a carrier KH570 coupling on the surface of SiO_2(MPS-SiO_2) and then MPS-SiO_2 was grafted with methyl methacrylate(PMAA-SiO_2). The catalysts were used for the alkylation reaction of tert butyl chloride with benzene. The results show the water resistance of the catalyst was improved obviously. The organic matter will hinder the loading of AlCl_3 and the reaction if methyl methacrylate was over grafted on surface of SiO_2.