Preparation and catalytic property of composite ionic liquid immobilized on SBA-15

In this work, we report a more simple and efficient way to synthesize a composite ionic liquid (IL) ([BMIM][Zn 2 Br 5 ]) by directly coupling the IL with molecular sieves. Two kinds of immobilized catalysts were successfully synthesized: SBA-15-[BMIM][Zn 2 Br 5 ] and SBA-15-CPTES-[BMIM][Zn 2 Br 5 ]. The catalysts were used to catalyze the cycloaddition reaction of continuous transformation of CO 2 and propylene oxide, and the catalytic performance of catalysts was further studied. Compared with the traditional IL catalysts, the catalysts not only have excellent catalytic performance, but also have a significantly longer service life. This is because the catalysts are formed by a high energy chemical bond of silane between IL catalysts and molecular sieves, which can effectively solve the problem of the loss of IL active components in the catalytic process.