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Carbon Dioxide Capture with Ionic Liquids and Deep Eutectic Solvents: A New Generation of Sorbents
Author(s) -
Sarmad Shokat,
Mikkola JyriPekka,
Ji Xiaoyan
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201600987
Subject(s) - ionic liquid , flue gas , moiety , absorption (acoustics) , eutectic system , surface modification , amine gas treating , sorption , chemical engineering , solvent , sorbent , materials science , chemistry , deep eutectic solvent , nanotechnology , process engineering , organic chemistry , adsorption , catalysis , alloy , engineering , composite material
High cost and high energy penalty for CO 2 uptake from flue gases are important obstacles in large‐scale industrial applications, and developing efficient technology for CO 2 capture from technical and economic points is crucial. Ionic liquids (ILs) show the potential for CO 2 separation owing to their inherent advantages, and have been proposed as alternatives to overcome the drawbacks of conventional sorbents. Chemical modification of ILs to improve their performance in CO 2 absorption has received more attention. Deep eutectic solvents (DESs) as a new generation of ILs are considered as more economical alternatives to cope with the deficiencies of high cost and high viscosity of conventional ILs. This Review discusses the potential of functionalized ILs and DESs as CO 2 sorbents. Incorporation of CO 2 ‐philic functional groups, such as amine, in cation and/or anion moiety of ILs can promot their absorption capacity. In general, the functionalization of the anion part of ILs is more effective than the cation part. DESs represent favorable solvent properties and are capable of capturing CO 2 , but the research work is scarce and undeveloped compared to the studies conducted on ILs. It is possible to develop novel DESs with promising absorption capacity. However, more investigation needs to be carried out on the mechanism of CO 2 sorption of DESs to clarify how these novel sorbents can be adjusted and fine‐tuned to be best tailored as optimized media for CO 2 capture.