Tuning the strength of cation coordination interactions of dual functional ionic liquids for improving CO2 capture performance
Tuning the strength of cation coordination interactions of dual functional ionic liquids for improving CO2 capture performance
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DOI：
10.1016/j.ijggc.2019.102934
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发表时间：
2020-03-01
影响因子：
3.9
通讯作者：
Xu, Yingjie
中科院分区：
文献类型：
--
作者：
Shu, Hegang;Xu, Yingjie
报道了一种通过调整碱金属螯合双功能离子液体（DFILs）阳离子配位相互作用强度来有效捕获CO2的新策略。CO2吸收与粘度实验、量子力学计算表明，碱金属离子与含有咪唑烷酮阴离子（[Im](-)）的DFILs烷醇胺配体之间的配位相互作用增强，导致受骗阳离子的稳定性提高，阳离子-阴离子螯合相互作用减弱，从而提高了DFILs的CO2捕获能力，降低了DFILs的粘度。其中，[K(DGA)(2)][Im]具有较强的阳离子配位作用和较低的粘度（249.8 mPa）。s)，表现出比其他DFILs更有效的CO2捕集能力，在大气压T = 333.2 K下15分钟内具有极高的CO2捕集能力（类似于1.37 mol/mol），并且具有良好的可逆性（5次循环）。光谱研究和量子力学计算表明，如此高的CO2容量源于[K(DGA)(2)][Im]的[K(DGA)(2)][Im]的[K(DGA)(2)]（+）和[Im]（-）与CO2反应。此外，[Im]（-）比[K(DGA)(2)]（+）更优先与CO2反应。
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)](+).