Formation of choline salts and dipolar ions for CO₂ reactive eutectic solvents

Abstract

Proton sharing among the constituents of the eutectic solvents demonstrates tunable uptake and microwave-assisted absorption–desorption recyclability for CO2 capture.

Composition–property relationships of choline based eutectic solvents: impact of the hydrogen bond donor and CO2 saturation

“…CO 2 absorption in these eutectic solvents is through chemisorption, where CO 2 binds to the HBA and HBDs upon contact and releases at elevated temperatures (see Fig. S12†), as detailed in an earlier study by Dikki et al 22 Accordingly, CO 2 primarily binds to the HBD ( i.e. , EG-CO 2 accompanied with H-transfer to the anion/Ch ± ).…”

“…CO 2 absorption and impact on physical properties CO 2 absorption in these eutectic solvents is through chemisorption, where CO 2 binds to the HBA and HBDs upon contact and releases at elevated temperatures (see Fig. S12 †), as detailed in an earlier study by Dikki et al 22 Accordingly, CO 2 primarily binds to the HBD (i.e., EG-CO 2 accompanied with H-transfer to the anion/Ch ± ). The measured CO 2 capacities and the changes in the viscosities and conductivities with CO 2 saturation are summarized in Table 4, along with a comparison to literature reporting these properties for similar solvents.…”

“…This proton sharing is observed experimentally in the synthesized Ch ± ImH and Ch ± PhOH HBAs. 22 However, it is not included in MD simulations for computational tractability, since modeling proton sharing is significantly more computationally demanding mixtures of Ch ± ImH with HBDs (at 1 : 1, 1 : 2, 1 : 3, 1 : 5, 1 : 7, and 1 : 10 molar ratios of HBA : HBD) is shown in Fig. 1.…”

Understanding the Electrode–Electrolyte Interfaces of Ionic Liquids and Deep Eutectic Solvents

“…Electrocatalysis is yet another domain where the interfacial structure is crucial to understand such as the case for the electrochemical CO 2 reduction reaction (CO 2 RR) . In particular, ILs and DESs are known for their high CO 2 solubility − and thus present advantages compared to the aqueous electrolytes with low CO 2 solubilities . The [EMIM]­[BF 4 ] IL was even reported to co-catalyze the CO 2 RR .…”

Thermal and Physical Properties of CO2-Reactive Binary Mixtures

“…In another study, the group explored the CO 2 capture mechanism within DES formed between EG and a protic IL, monoethanolamine-imidazole ([MEAH][Im]) . Similarly, in a recent communication, Dikki et al examined the formation of functionalized eutectics by mixing choline-based sorbents as HBAs with EG as the HBD. The authors investigated the effect of anion exchange using imidazole (ImH), phenol (PhOH), pyrrole-2-carbonitrile (CNpyrH), and 1,2,4-triazole (TrzH) as anions for choline-based sorbents and the deprotonation of EG upon the formation of these eutectic solvents and further ascertained the significance of using these reactive eutectic solvents for CO 2 capture.…”