Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 58, Issue 2, Pages 872-878Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.8b05134
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Funding
- National Natural Science Foundation of China [21673060]
- State Key Lab of Urban Water Resource and Environment of Harbin Institute of Technology [HIT2017DX10]
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The combination from hyperbranched polyethylenimine and Lewis acid ZnI2 (PEI/ZnI2) was facilely obtained, and they showed an efficient activity to the reaction of epoxides and CO2 because of these abundant primary, secondary, and tertiary amines of PEI; additionally, ZnI2 made contribution to the activation of epoxide. With 0.15 g PEI-4 (MW 70 000) and the molar percentage of 2.0 mmol % ZnI2 to propylene oxide (PO), 95% yield was achieved at 100 degrees C, 3.0 h, and 1.0 MPa, and the selectivity was 96%. Moreover, the PEI-4 catalyst preparation avoided toxic solvents and the harsh preparation conditions. Furthermore, PEI-4/ZnI2 was easily recycled from the entire system. The catalytic system maintained excellent recyclability up to eight times with satisfactory activity, and thus, the facile and efficient PEI-4/ZnI2 catalysts were considered as an industrial candidate for the reaction of epoxides and CO2 to cyclic carbonates.
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