Synthesis And Catalytic Performance Of Amino Functionalized Ionic Liquids

Carbon dioxide is the largest contributor to the greenhouse effect; however, it is also an important C1 resource. Under these circumstances, chemical fixation of carbon dioxide turns out to be beneficial both for environment protection and resource cyclic utilization. Synthesis of cyclic carbonates from carbon dioxide and epoxides is a successful application for chemical utilization of carbon dioxide. Ionic liquids, which were called green catalysts, showed a competitive catalytic performance during various catalyst systems. For the last decades, lots of effective ionic liquids were used for this reaction, but they still suffered the low activities and harsh reaction conditions. Thus, the development of more effective ionic liquid catalyst systems for synthesis of cyclic carbonatesis is still a challenging task, which is useful for both academic research and industrial production.In this thesis, a series of amino-functional ionic liquids were prepared and used as catalysts for synthesis of cyclic carbonates from carbon dioxide and epoxides. The influence of different structures on the catalytic performance was investigated and the reaction parameters were optimized. Under the optimized conditions (120℃..1.5 MPa、 2.0 h), the yield of propylene carbonate achieved 98.0% when [APbim]I was employed as the catalyst. Besides, the catalytic performance of [APbim]I worked well for various epoxides and carbon dioxide and the catalyst could be reused for 9 times with slight decrease in catalytic activity.An amino-functional ionic liquid non-covalently grafted on sulfonic resin with an ionic bond is reported for the first time as an efficient and recyclable single-component catalyst for the synthesis of cyclic carbonates from CO2 and epoxides. Under the optimum conditions(140’C℃.0 MPa、4.0 h), the propylene carbonate was yield to 93.1% when [APbim]I-PS was used as the catalyst. The catalyst can be easily recovered by filtration and reused for at least 5 times without appreciable loss of its catalytic activity. Moreover, a new Lewis acid-base composite immobilized catalyst was synthesized by incorporation of zinc into non-covalently grafted ionic liquids on sulfonic resin. The Lewis acid-base composite immobilized catalyst turned out to be more effective than immobilized ionic liquid. Under the optimized reaction conditions (140℃、.5 MPa、3.0 h), the yield of propylene carbonate was up to 93.0%and TOF of 713 h-1 was achieved.