CO2 Capture Mechanism by Deep Eutectic Solvents Formed by Choline Prolinate and Ethylene Glycol

Abstract

The choline prolinate ([Ch][Pro]) as a hydrogen bond acceptor and ethylene glycol (EG) as a hydrogen bond donor are both used to synthesize the deep eutectic solvents (DESs) [Ch][Pro]-EG to capture CO2. The CO2 capacity of [Ch][Pro]-EG is determined, and the nuclear magnetic resonance (NMR) and infrared (IR) spectrum are used to investigate the CO2 capture mechanism. The results indicate that CO2 reacts with both the amino group of [Pro]− anion and the hydroxyl group of EG, and the mechanism found in this work is different from that reported in the literature for the [Ch][Pro]-EG DESs.

CO2 Absorption by Solvents Consisting of TMG Protic Ionic Liquids and Ethylene Glycol: The Influence of Hydrogen Bonds

“…The above-mentioned new peaks suggest that CO2 reacts with E the solvent, forming EG-derived carbonate [39,40]. The peak at 157.3 (C-4) ppm is tributed to the carbonyl carbon of the carbonate species produced from the reaction tween CO2 and EG [41]. For the [TMGH][Car]:EG (1:3) system, similar new hydrogen carbon peaks can be detected as well in the NMR spectra after capture (Figure S3).…”

Deep eutectic solvents as a versatile platform toward CO2 capture and utilization

“…Accordingly, ternary amine- and/or superbase-derived DESs have been developed to improve the absorption performance, and EG is a common additive agent in DESs to reduce the viscosity. 106,107 The introduction of EG into amine-based DESs not only enhances absorption kinetics but also improves regeneration ability. 27 The experimental and DFT results demonstrate that CO 2 interacts with the amine group in MEA and the –OH group in EG, leading to the formation of carbamate (Fig.…”

Natural Deep Eutectic Solvents as Rust Removal Agents from Lithic and Cellulosic Substrates

“…In recent years, DESs have shown enormous potential for various applications thanks to their ability to solubilize compounds otherwise not soluble in classical organic solvents [20], such as separation and extraction processes [21][22][23][24], synthesis [25][26][27][28], biocatalysis [29,30], CO 2 capture [31][32][33], drug delivery [34][35][36], to mention just a few recent reviews.…”