Research advance of heterogeneous catalytic system for the coupling between CO2 and epoxide into propylene carbonate
As the most important greenhouse gas,carbon dioxide(CO2)has caused serious environmental problems by excessive emission.On the other hand,CO2 is an abundant,cheap,safe and renewable C1 resource,and thus is considered as an ideal carbon material in organic synthesis.Efficient and green chemical fixing CO2 to prepare cyclic carbonate with high boiling,high polarity,low volatility and biological degradability is an effective way of CO2 resource utilization,which has attracted wide attention.In this paper,the existing reaction pathways for the synthesis of cyclic carbonate are briefly described.Then,staring with the coupling reaction of CO2 with epoxides,we emphatically analyze the reaction mechanism,and the design ideas and current research advance of the heterogeneous catalytic system.Meanwhile,the advantages and disadvantages of the catalytic parameters such as catalytic conditions,catalytic activity and recyclability,of different heterogeneous catalytic systems are comprehensively compared.Finally,the application and development prospects of different heterogeneous catalytic systems are summarized and suggested.In the future,heterogeneous catalytic systems should be combined with homogeneous ones,which could efficiently activate CO2 and epoxides under mild conditions by utilizing their advantages.
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