CO_2 Capture by Ionic Liquids - An Answer to Anthropogenic CO_2 Emissions?

摘要

Ionic liquids (ILs) are efficient solvents for the selective removal of CO_2from flue gas. Conventional, off-the-shelf ILs are limited in use to physisorption, which restricts their absorption capacity. After adding a chemical functionality like amines or alcohols, absorption of CO_2 occurs mainly by chemisorption. This greatly enhances CO_2 absorption and makes ILs suitable for potential industrial applications. By carefully choosing the anion and the cation of the IL, equimolar absorption of CO_2 is possible. This paper reviews the current state of the art of CO_2 capture by ILs and presents the current research in this field performed at the ChemTech Institute of the Ecole d'lngenieurs et d'Architectes de Fribourg.