Alkylimidazolium-based ionic liquids with tailored anions and cations for CO2 capture

Abdelbagi Osman; Abobakr K Ziyada; Abdul Majeed Khan; Fahd Rajab

doi:10.1039/d3ra08335g

Alkylimidazolium-based ionic liquids with tailored anions and cations for CO₂ capture

RSC Adv. 2024 Jan 29;14(6):3985-3995. doi: 10.1039/d3ra08335g. eCollection 2024 Jan 23.

Authors

Abdelbagi Osman¹, Abobakr K Ziyada², Abdul Majeed Khan², Fahd Rajab¹

Affiliations

¹ Department of Chemical Engineering, College of Engineering, Najran University P.O. Box 1988 Najran 11001 Saudi Arabia aomustafa@nu.edu.sa fmrajab@nu.edu.sa.
² Department of General Studies, Jubail Industrial College PO Box 10099 Jubail Industrial City 31961 Saudi Arabia taha_a@rcjy.edu.sa abubakrkhz@yahoo.com khan_am@rcjy.edu.sa.

Abstract

A systematic investigation was conducted in the present study to determine how various cations and anions affected the solubility of CO₂. To investigate the influence of different cations and anions on the solubility of CO₂, twelve ILs were synthesized, characterized, and utilized. These ILs comprised five distinct anions (dioctylsulfosuccinate [DOSS], triflouromethanesulfonate [TFMS], dodecylsulfate [DDS], 3-sulfobezoate [SBA], and benzene sulfonate [BS]), and four distinct cations (1-butyl-3-propanenitrile imidazolium [C₂CN Bim], 1-hexyl-3-propanenitrile imidazolium [C₂CN Him], 1-octyl-3-propanenitrile imidazolium [C₂CN Oim], and 1-decyl-3-propanenitrile imidazolium [C₂CN Dim]). The synthesized ILs were characterized using NMR and elemental analysis. Their moisture and halide contents were determined. The gravimetric method (MSB) was employed to determine the solubility of CO₂ at various pressures (20, 15, 10, 5, and 1 bar). In addition, the effects of temperature on the solubility of CO₂ were investigated. The constant of Henry's law (k_H) was also calculated, along with thermodynamic properties including standard enthalpy (H⁰), entropy (S⁰), and Gibbs free energy (G⁰).