Journal
CHEMSUSCHEM
Volume 10, Issue 24, Pages 4927-4933Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201701044
Keywords
bicarbonate species; carbon dioxide capture; confined water; ionic liquids; nuclear magnetic resonance
Funding
- CNPq
- CAPES
- Petrobras
- FAPESP [2015/08541-6]
- FCT (RNRMN) [PTDC/QUI/64744/2006, RECI/BBB-BQB/0230/2012]
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Confined water in aqueous solutions of imidazolium-based ionic liquids (ILs) associated with acetate and imidazolate anions react reversibly with CO2 to yield bicarbonate. Three types of CO2 sorption in these IL aqueous solutions were observed: physical, CO2-imidazolium adduct generation, and bicarbonate formation (up to 1.9mol(bicarbonate) mol(-1) of IL), resulting in a 10:1 (molar ratio) total absorption of CO2 relative to imidazolate anions in the presence of water 1:1000 (IL/water). These sorption values are higher than the classical alkanol amines or even alkaline aqueous solutions under similar experimental conditions.
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