A green catalysis of CO2fixation to aliphatic cyclic carbonates by a new ionic liquid system

Wing Leung Wong, Yoon Suk Lee, Kam Piu Ho, Zhong Yuan Zhou, Ting Fan, Zhenyang Lin, Kwok Yin Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

27 Citations (Scopus)


A mixed ionic liquid system has been developed for the efficient catalysis of CO2addition to aliphatic epoxides without involving any transition metal catalysts or other additives. The ionic liquid integrated with pyridinium and pyrrolidinium groups (1·(Br)3) together with a non-polar ionic liquid (3·(Ntf)2) effectively transformed non-polar aliphatic epoxides to cyclic carbonates by the reaction with CO2under mild CO2pressure (3.0 MPa) and reaction temperature (80 C). The presence of 3·(Ntf)2remarkably improved the catalytic activity of 1·(Br)3towards non-polar epoxides by increasing the miscibility of catalyst with the substrates. The mixed ionic liquid system is robust enough to be recycled without any significant loss of catalytic activity. GC-MS studies were performed to reveal the reaction pathways to the cyclic carbonates and a feasible model accounting for the effective CO2activation in the ionic liquid system was proposed using density functional theory (DFT) calculations.
Original languageEnglish
Pages (from-to)160-166
Number of pages7
JournalApplied Catalysis A: General
Publication statusPublished - 22 Feb 2014


  • CO fixation 2
  • Cyclic carbonate
  • Green chemistry
  • Ionic liquid
  • Organocatalysis

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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