Details

Autor(en) / Beteiligte

• 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
• Au, Chak-Tong

Titel

Catalytic fixation of CO sub(2) to cyclic carbonates over biopolymer chitosan-grafted quarternary phosphonium ionic liquid as a recylable catalyst

Ist Teil von

• Applied catalysis. A, General, 2014-08, Vol.484, p.26-32

Erscheinungsjahr

2014

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• 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 CO sub(2) cycloaddition to epoxides in the absence of co-catalyst and solvent. High yield of propylene carbonate (96.3%) is obtained at 120 [degrees]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 [BuPh sub(3)P] super(+)), 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 signincant 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.