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High CO2 absorption capacity by chemisorption at cations and anions in choline-based ionic liquids

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Abstract

The effect of CO2 absorption on the aromaticity and hydrogen bonding in ionic liquids is investigated. Five different ionic liquids with choline based cations and aprotic N-heterocyclic anions were synthesized. Purity and structures of the synthesized ionic liquids were characterized by 1H and 13C NMR spectroscopy. CO2 capture performance was studied at 20 °C and 40 °C under three different pressures (1, 3, 6 bar). The IL [N1,1,6,2OH][4-Triz] showed the highest CO2 capture capacity (28.6 wt%, 1.57 mol of CO2 per mol of the IL, 6.48 mol of CO2 per kg of the ionic liquid) at 20 °C and 1 bar. The high CO2 capture capacity of the [N1,1,6,2OH][4-Triz] IL is due to the formation of carbonic acid (–OCO2H) together with carbamate by participation of the –OH group of the [N1,1,6,2OH]+ cation in the CO2 capture process. The structure of the adduct formed by CO2 reaction with the IL [N1,1,6,2OH][4-Triz] was probed by using IR, 13C NMR and 1H–13C HMBC NMR experiments utilizing 13C labeled CO2 gas. 1H and 13C PFG NMR studies were performed before and after CO2 absorption to explore the effect of cation–anion structures on the microscopic ion dynamics in ILs. The ionic mobility was significantly increased after CO2 reaction due to lowering of aromaticity in the case of ILs with aromatic N-heterocyclic anions.

Graphical abstract: High CO2 absorption capacity by chemisorption at cations and anions in choline-based ionic liquids

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Publication details

The article was received on 17 Oct 2017, accepted on 02 Nov 2017 and first published on 02 Nov 2017


Article type: Paper
DOI: 10.1039/C7CP07059D
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
  • Open access: Creative Commons BY license
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    High CO2 absorption capacity by chemisorption at cations and anions in choline-based ionic liquids

    S. Bhattacharyya, A. Filippov and F. U. Shah, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP07059D

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