Abstract
An ionic liquid 1-(triethoxysilyl)propyl-3-methylimidazolium hydroxide ([Smim]OH) was grafted on silica gel with different amount by post-grafting method. Such grafted ionic liquids (GILs), which were verified by means of FTIR, element analysis,
29Si MAS NMR and N
2 adsorption–desorption could be used as highly effective heterogeneous catalysts toward propylene carbonate synthesis through cycloaddition of CO
2 with propylene oxide under solventless and mild conditions.