Catalytic fixation of CO2 to cyclic carbonates over biopolymer chitosan-grafted quarternary phosphonium ionic liquid as a recylable catalyst

Chen Jing-Xian, Jin Bi, Dai Wei-Li*, Deng Sen-Lin, Cao Liu-Ren, Cao Zong-Jie, Luo Sheng-Lian, Luo Xu-Biao, Tu Xin-Man, Chak Tong AU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

We prepared chitosan-grafted quarternary phosphonium ionic liquid (1-butyl-triphenylphosphonium bromide) by a simple method and used it as catalyst for the synthesis of cyclic carbonates through CO2 cycloaddition to epoxides in the absence of co-catalyst and solvent. High yield of propylene carbonate (96.3%) is obtained at 120 °C and 2.5 MPa in 4 h. We studied the roles of chitosan hydroxyl groups and ionic liquid counter anions on catalytic activity. It is proposed that the facilitation of ring opening of epoxides is a combined result of polarization (by hydrogen bonding due to hydroxyl groups), electronic interaction (by [BuPh3P]+), and nucleophilic attack (by bromide anion). The catalyst can be easily recovered and reused as demonstrated in a test of five runs without showing any significant loss of activity. From the view point of commercial application, the catalyst is attractive because it is low-cost, ecology-safe, stable and efficient. Furthermore, it is potentially applicable for fixed-bed continuous flow reactors.

Original languageEnglish
Pages (from-to)26-32
Number of pages7
JournalApplied Catalysis A: General
Volume484
DOIs
Publication statusPublished - 22 Aug 2014

Scopus Subject Areas

  • Catalysis
  • Process Chemistry and Technology

User-Defined Keywords

  • Carbon dioxide fixation
  • Chitosan
  • Cyclic carbonate
  • Cycloaddition reaction
  • Quarternary phosphonium ionic liquid

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