文献类型：期刊文献

英文题名：Tuning the strength of cation coordination interactions of dual functional ionic liquids for improving CO2 capture performance

作者：Shu, Hegang[1];Xu, Yingjie[1]

机构：[1]Shaoxing Univ, Dept Chem, Shaoxing 312000, Zhejiang, Peoples R China

年份：2020

卷号：94

外文期刊名：INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL

收录：SCI-EXPANDED(收录号：WOS:000517582000021)、、WOS

基金：The authors are grateful for the National Natural Science Foundation of Zhejiang Province (Y18B060014 and LY14B060002), National Natural Science Foundation of China (No. 21978172 and No. 21406140). Authors also thank Prof. Y. Wang at Zhejiang University for providing Gaussian 09 suite of programs.

语种：英文

外文关键词：Ionic liquids; Alkali metal chelated; CO(2)capture; Imidazolide anion; Coordination interaction

外文摘要：A novel strategy for efficient CO2 capture by tuning the strength of cation coordination interactions of alkali metal chelated dual functional ionic liquids (DFILs) is reported. CO2 absorption and viscosity experiment, quantum-mechanical calculations showed that the strengthening of the coordination interactions between alkali metal ions and alkanolamine ligands of DFILs containing imidazolide anion ([Im](-)) leads to improve the stability of the cheated cation and weaken the chelated cation-anion interaction, resulting in efficient CO2 capture capacity and reducing the viscosity of DFILs. Particularly, [K(DGA)(2)][Im] has the stronger cation coordination interactions and lower viscosity (249.8 mPa.s), exhibiting more efficient CO2 capture capacity than other DFILs, with an extremely high capacity of CO2 (similar to 1.37 mol/mol) in 15 min at T = 333.2 K under atmospheric pressure and good reversibility (5 recycles). Spectroscopic investigations and quantum-mechanical calculations showed that such high CO2 capacity originates from the fact that both [K(DGA)(2)](+) and [Im](-) of [K(DGA)(2)][Im] react with CO2. Moreover, [Im](-) reacts preferentially with CO2 over [K(DGA)(2)](+).