Synthesis of Propylene Carbonate With CO2 and Propylene Oxide Catalyzed by Amino and Hydroxyl Ionic Liquids Supported on Molecular Sieve
ZHANG Wenlin, HE Jiaming, ZHANG Bin, LI Chunli
National-Local Joint Engineering for Energy Conservation in Chemical Process Integration and Resources Utilization, School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China
Bifunctional group ionic liquid chlorination 1-(2-ethoxy)-3-imidazolyl-propylamine containing amino and hydroxyl， and single amino functional group ionic liquid chlorination 1-amine propyl-3-methylimidazole were synthesized, respectively. The ionic liquids (ILs) were loaded on the mesoporous molecular sieve SBA-15, and their catalytical performance for the reaction of CO2 and propylene oxide (PO) to propylene carbonate (PC) were investigated. NMR was employed to characterize the catalysts in the above process. Experimental results indicated that, compared with singe functional group ILs, bifunctional group ILs had better catalytic efficiency. Under the conditions of temperature 373 K and pressure 1.8 MPa, PO conversion and PC selectivity could reach 90.4% and 92.5%, respectively. With applying Gaussian 09 software, density functional theory (DFT) was used to theoretically analyze the stable structure, interactive relationship, combination bond energy, charge distribution, electrostatic potential energy difference, frontier orbital of ILs and PO. Through above calculation, it can be found that the coupling of amino and hydroxyl on the functional group of ILs and PO can generate hydrogen bonds, and then possible cycloaddition reaction mechanism is proposed.
张文林，和佳明，张宾，李春利. 分子筛负载氨基、羟基离子液体催化CO2和环氧丙烷合成碳酸丙烯酯[J]. 石油学报（石油加工）, 2020, 36(3): 575-583.
ZHANG Wenlin, HE Jiaming, ZHANG Bin, LI Chunli. Synthesis of Propylene Carbonate With CO2 and Propylene Oxide Catalyzed by Amino and Hydroxyl Ionic Liquids Supported on Molecular Sieve. ACTA PETROLEI SINICA (PETROLEUM PROCESSING SECTION, 2020, 36(3): 575-583.
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