| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 150188 | Chemical Engineering Journal | 2012 | 7 Pages |
The absorption ability of carbon dioxide in ionic liquids (IL) containing a basic anion like acetate was investigated and compared to common ionic liquids as well as nitrogen data. Thereby, the IL showed chemisorption due to a formation of carboxylate at the imidazolium ring. The results obtained from [EMIM] [pivalate] are promising, since the IL could be completely recovered with a simple evacuating step, and without further heating, while having a similar absorption ability than [EMIM] [OAc].From the temperature dependency of the carbon dioxide absorption in [EMIM] [OAc] it can be seen that the solvation enthalpy is much smaller compared to common ionic liquids with physical absorption.Furthermore, the addition of the superbase DBU to [EMIM] [OAc] increased the CO2-loading capacity.
► Chemical absorption of CO2 in ionic liquids (IL) with an imidazolium cation and a carboxylic anion. ► Henry's law constants and loading capacities were determined for CO2 and N2. ► Connection between basicity of anion and CO2 loading capacity. ► Addition of superbase can improve chemical absorption.
