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In this study, three different metal-containing ionic liquid catalysts were prepared by metal insertion and characterized by various physicochemical analytic methods. The catalytic performance of the metal containing ionic liquids in the cycloaddition of CO2 with propylene oxide (PO) to produce propylene carbonate (PC) was investigated under the solvent free condition. The order of approximate rate constants (Kapp) for the metal containing ionic liquid catalysts was (MeIm)2ZnCl2, > (MeIm)2FeCl2 > (MeIm)2CuCl2. These results are in accord with the experimentally obtained activity order of the different metal containing ionic liquid catalysts.

Synthesis of Propylene Carbonate over Metal containing Ionic Liquid Catalysts