Carbon Dioxide Capture by Aqueous Ionic Liquid Solutions

Nathalia M Simon; Marcileia Zanatta; Francisco P Dos Santos; Marta C Corvo; Eurico J Cabrita; Jairton Dupont

doi:10.1002/cssc.201701044

Carbon Dioxide Capture by Aqueous Ionic Liquid Solutions

ChemSusChem. 2017 Dec 22;10(24):4927-4933. doi: 10.1002/cssc.201701044. Epub 2017 Aug 9.

Authors

Nathalia M Simon¹, Marcileia Zanatta¹, Francisco P Dos Santos¹, Marta C Corvo², Eurico J Cabrita³, Jairton Dupont¹

Affiliations

¹ Institute of Chemistry, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, 91501-970 RS, Brazil.
² I3N-CENIMAT, Dep. Ciência dos Materiais, Fac. Ciências e Tecnologia, UNL, 2829-516, Caparica, Portugal.
³ UCIBIO-REQUIMTE, Dep. Química, Fac. Ciências e Tecnologia, UNL, 2829-516, Caparica, Portugal.

PMID: 28742268
DOI: 10.1002/cssc.201701044

Abstract

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 1.9 mol_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.

Keywords: bicarbonate species; carbon dioxide capture; confined water; ionic liquids; nuclear magnetic resonance.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Carbon Dioxide / chemistry*
Ionic Liquids / chemistry*
Solutions / chemistry
Water / chemistry*

Substances

Ionic Liquids
Solutions
Water
Carbon Dioxide