(18a) Screening of Ionic Liquids for CO2 Capture at Ambient Conditions

The anthropogenic emission of CO₂ to the environment enhances its concentration in the atmosphere and becomes a significant source of global warming and the greenhouse effect. Therefore, via the Paris agreement, countries have decided to reduce their CO₂ emission drastically so that global temperature rises do not exceed 2 ℃. The application of room-temperature ionic liquids (RTILs) is a practical approach presently being industrialized to capture CO₂ by chemisorption. Recently, it was observed that large amounts of CO₂ could be dissolved selectively and efficiently in a particular RTIL. Therefore, screening the RTILs is an essential parameter for the selective capture of CO₂. The simple measurement of the significant parameter of the CO₂ in RTILs, like diffusivity and solubility, is crucial for the progress of this research field. In this manner, an airtight glass vial was used to capture CO₂ into RTILs, and the equilibration of the absorption was analyzed by estimating Henry’s constant at room temperature. In addition, time-dependent CO₂ absorption was also performed to screen the RTILs for capturing CO₂.