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Sponge-like quaternary ammonium-based poly(ionic liquid)s for high CO2 capture and efficient cycloaddition under mild conditions

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Abstract

Mesoporous poly(ionic liquid)s (MPILs) are promising candidates for CO2 capture and CO2 conversion; however, no quaternary ammonium-based MPIL has been reported for cycloaddition of CO2 to epoxides. Herein, a series of novel sponge-like crosslinked quaternary ammonium-based MPILs containing rich exposed anions and a large surface area were successfully prepared by free-radical polymerization and subsequent supercritical CO2 drying (SCD). It was discovered that the SCD treatment was vital to form the mesoporous structure of MPILs. These MPILs behaved like a CO2 sponge and facilitated high CO2 adsorption, which accelerated the cycloaddition process. Among these MPILs, poly(N,N′-(methylene)bis(N,N-dimethyl-1-(4-vinylphenyl)methanaminium)chloride) with a halogen anion-enriched skeleton showed the best catalytic performance for CO2 cycloaddition with various epoxides under mild conditions, i.e. 1 atm, 90 °C, solvent-free, metal-free, and additive-free conditions. Density functional theory (DFT) calculations showed that the activation energy was lower for the rate-determining epoxy ring-opening step when the quaternary ammonium monomer was used as compared to the case when the imidazolium monomer was used, revealing the lower CO2 cycloaddition temperature with the quaternary ammonium-based MPIL. Moreover, the catalyst can be separated easily and reused with high stability.

Graphical abstract: Sponge-like quaternary ammonium-based poly(ionic liquid)s for high CO2 capture and efficient cycloaddition under mild conditions

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Publication details

The article was received on 02 Nov 2017, accepted on 21 Nov 2017 and first published on 21 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA09656A
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Sponge-like quaternary ammonium-based poly(ionic liquid)s for high CO2 capture and efficient cycloaddition under mild conditions

    Y. Xie, Q. Sun, Y. Fu, L. Song, J. Liang, X. Xu, H. Wang, J. Li, S. Tu, X. Lu and J. Li, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA09656A

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