Citation: Xiying Fu, Pengtao Xie, Yiwei Lian, Leqin He, Wei Zhao, Tao Chang, Shenjun Qin. Temperature-responsive self-separation ionic liquid system of zwitterionic-type quaternary ammonium-KI for CO₂ fixation[J]. Chinese Journal of Catalysis, ;2018, 39(11): 1854-1860. doi: 10.1016/S1872-2067(18)63101-8 shu

Temperature-responsive self-separation ionic liquid system of zwitterionic-type quaternary ammonium-KI for CO₂ fixation

Xiying Fu ^a, ,
Pengtao Xie ^b ,
Yiwei Lian ^a ,
Leqin He ^a ,
Wei Zhao ^c ,
Tao Chang ^a ,
Shenjun Qin ^a

a College of Material Science and Engineering, Hebei University of Engineering, Handan 056038, Hebei, China;
b College of Chemical Engineering and Materials, Handan College, Handan 056005, Hebei, China;
c College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, Henan, China

Received Date: 31 March 2018
Revised Date: 14 May 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (41330317, 21403051), the Natural Science Foundation of Hebei province (B2016402030, B2017402079), the Science and Technology Foundation of Universities of Hebei Province (ZD2015113), the Science and Technology Research Development Program of Handan (1621211041-3, 1622201049-2), and the Program for One Hundred Innovative Talents in Universities of Hebei Province (BR2-204).

A series of zwitterionic-type quaternary ammoniums (ZTQAs) with varying lengths of alkyl chains combined with KI were synthesized and considered as catalysts for the coupling reaction of CO₂ and various terminal epoxides. The prolonged alkyl chain of ZTQAs exhibited temperature-responsive self-separation in propylene carbonate (PC). The interaction between ZTQAs and KI was confirmed by X-ray photoelectron spectroscopy and quantum chemical calculations. This interaction strengthened the nucleophilicity of the I^- ion, favoring the catalytic reaction. The 3-(dimethyltetradecylammonium) propane sulfonate (DTPS)/KI showed an excellent yield of PC (95.1%) at 125℃, 1.5 MPa, and 1 mol% loading of catalyst. The precipitate formed spontaneously from the catalytic system, providing high catalytic activity of the homogeneous catalyst, as well as easy recovery of the heterogeneous catalyst.
- Carbon dioxide,
- Self-separation,
- Cyclic carbonate,
- Zwitterionic-type quaternary ammonium,
- KI
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Temperature-responsive self-separation ionic liquid system of zwitterionic-type quaternary ammonium-KI for CO2 fixation

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Temperature-responsive self-separation ionic liquid system of zwitterionic-type quaternary ammonium-KI for CO₂ fixation