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Polymer grafted with asymmetrical dication ionic liquid as efficient and reusable catalysts for the synthesis of cyclic carbonates from CO2 and expoxides

Paper ID Volume ID Publish Year Pages File Format Full-Text
54317 47005 2014 8 PDF Available
Title
Polymer grafted with asymmetrical dication ionic liquid as efficient and reusable catalysts for the synthesis of cyclic carbonates from CO2 and expoxides
Abstract

•Polymer grafted with asymmetrical dication ionic liquid (PDIL) was synthesized.•The PDIL shows high catalytic activity and selectivity for cycloaddition reactions.•The PDIL shows good stability and reusability.•A plausible mechanism for cycloaddition reaction over PDIL is proposed.

Polymer grafted with asymmetrical dication ionic liquid (IL) based on imidazolium and phosphonium ([P-Im-C4H8Ph3P]Br2) was fabricated, and for the first time evaluated as catalyst for the synthesis of cyclic carbonates from epoxides and CO2 without using any co-catalyst and solvent. The catalyst showed much superior activity than monocation imidazolium and phosphonium ILs. At a low catalyst loading (0.38 mol%), high yield (96.8%) and selectivity (99.5%) of propylene carbonate can be obtained over [P-Im-C4H8Ph3P]Br2 at 130 °C and 2.5 MPa in 4 h. The cooperation of nucleophilic attack of bromine anions as well as the activation of the two cations may contribute to the good activity of the catalyst. Furthermore, the catalyst shows excellent stability and reusability. It can be reused for up to five runs without any significant loss of catalytic activity after simple filtration.

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Keywords
Carbon dioxide; Epoxide; Cyclic carbonate; Asymmetrical dication ionic liquid; Heterogeneous catalysis
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Polymer grafted with asymmetrical dication ionic liquid as efficient and reusable catalysts for the synthesis of cyclic carbonates from CO2 and expoxides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 233, 15 September 2014, Pages 92–99
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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