Eda Cagli, Harrison Liu, Vaishali Khokhar, Aidan Klemm, Burcu E. Gurkan
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Thermal and Physical Properties of CO2-Reactive Binary Mixtures
Binary solvent mixtures based on 1-ethyl-3-methylimidazolium 2-cyanopyrrolide, [EMIM][2-CNpyr], an ionic liquid (IL), and a series of hydrogen bond donors (HBDs) including ethylene glycol (EG), propylene glycol (PG), and monoethanolamine (MEA) were characterized in terms of temperature-dependent densities and viscosities along with their thermal stability and CO2 absorption–desorption capability. NMR and FTIR were employed to observe the effect of the IL/HBD composition on intermolecular interactions. Among the investigated mixtures, IL/EG (1:2) showed the most efficient absorption–desorption performance and thermal stability. Though IL/PG and IL/EG had similar CO2 absorption capacities, the IL/PG exhibited the highest viscosity, which limited the CO2 transport in the solvent. The IL/MEA solvent possesses significant CO2 absorbance capability; however, the strong binding energy between MEA and CO2 and the increased viscosity during absorption led to difficulties in CO2 desorption. This study highlights the modification of intermolecular interactions in IL/HBD binary mixtures with respect to the choice of HBDs, reflected by their distinct physical properties and CO2 binding behavior.
期刊介绍:
The Journal of Chemical & Engineering Data is a monthly journal devoted to the publication of data obtained from both experiment and computation, which are viewed as complementary. It is the only American Chemical Society journal primarily concerned with articles containing data on the phase behavior and the physical, thermodynamic, and transport properties of well-defined materials, including complex mixtures of known compositions. While environmental and biological samples are of interest, their compositions must be known and reproducible. As a result, adsorption on natural product materials does not generally fit within the scope of Journal of Chemical & Engineering Data.