Ionic liquids, or salts in the liquid state, have been shown to be a promising avenue for clean energy research because of their ability to capture gaseous CO2. Their composition of poorly-coordinated ions gives them a multitude of interesting properties and a high degree of tunability. Many ionic liquids can undergo multiple capture cycles, releasing CO2 when the temperature is raised before lowering the temperature in preparation for capturing more CO2. As a result, significant research is required before these materials can be implemented in an industrial setting to capture CO2. In this study, we used temperature dependent infrared (IR) spectroscopy to observe vibrational changes in a variety of ionic liquids. Specifically, the behavior of phosphonium and imidazolium ionic liquids was studied at varying temperatures. Here we report that the anions within an ionic liquid have a noticeable effect on their cation counterpart. Furthermore, the temperature dependence of the peaks in IR spectra is not uniform across these ionic liquids. Future studies with these results in mind can help better predict the CO2 capture abilities of ionic liquids. The better we understand the behavior of ionic liquids, the closer we come to reducing harmful CO2 emissions.

Temperature dependent infrared spectra of ionic liquids for carbon dioxide capture

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.