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Anthropogenic CO 2 emissions into the atmosphere are responsible for the global warming, therefore, it is essential to reduce these emissions at the source. Recently, deep eutectic solvents (DESs) have shown great potential to absorb the CO 2 . In the current study, 15 different types of amine-and glycol-based deep eutectic solvents were synthesized and investigated for CO 2 absorption. In general, aminebased solvents have shown higher CO 2 absorption as compared to glycol based solvents. In particular, the highest CO 2 absorption was observed for the tetrabutyl ammonium bromide and methyldiethanol amine (TBAB/4MDEA) system having a CO 2 solubility of 0.29 (mol CO 2 /mol solvent) at 1 MPa and 303.15 K. Thermophysical properties of all synthesized DESs were estimated using the modified Lydersen−Joback−Reid method and Lee−Kesler mixing rule. Experimental CO 2 solubility data were well fitted using the nonrandom two liquid and the Peng−Robinson thermodynamic models. Apart, CO 2 solubility data were correlated with Henry's law, and Henry's constant was calculated for all DESs. The kinetic modeling of CO 2 absorption in DESs was also studied and rate constants were evaluated.

The influence of pore size distribution of the phenol-based adsorbents (RP-15 and RP-20) on adsorption and desorption of methane was investigated. The isotherm data were measured using a static volumetric method at three different temperatures (293.15, 303.15, and 313.15) K and at pressures up to 35 atm. Experimental data were well-correlated by the Sips and Toth isotherm models. The surface energetic characteristics of the adsorbents were evaluated by using the Clausius-Clapeyron equation.

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