Abstract
A novel strategy based on the concept of preorganization and cooperation has been designed for a superior capacity to capture low-concentration CO2 by imide-based ionic liquids. By using this strategy, for the first time, an extremely high gravimetric CO2 capacity of up to 22 wt % (1.65 mol mol−1) and excellent reversibility (16 cycles) have been achieved from 10 vol. % of CO2 in N2 when using an ionic liquid having a preorganized anion. Through a combination of quantum-chemical calculations and spectroscopic investigations, it is suggested that cooperative interactions between CO2 and multiple active sites in the preorganized anion are the driving force for the superior CO2 capacity and excellent reversibility.
Original language | English |
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Pages (from-to) | 13293-13297 |
Number of pages | 5 |
Journal | Angewandte Chemie - International Edition |
Volume | 56 |
Issue number | 43 |
DOIs | |
State | Published - Oct 16 2017 |
Funding
This work was supported by the National Natural Science Foundation of China (No. 21403059, 21673068), the National Key Research and Development Program of China (No. 2017YFA0403101), and the Science Foundation for Excellent Young Scholars of Henan Normal University (No. 15YQ002). G.K.C. and S.D. were supported by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, US Department of Energy. We thank Dr. Duan-Jian Tao from Jiangxi Normal University for helpful discussions. The DFT calculations were supported by the High Performance Computing Center of Henan Normal University.
Keywords
- anions
- carbon dioxide fixation
- cooperative effects
- ionic liquids
- preorganization