Potential use of organic liquid mixtures consisting of amines, 1,5-diazabicyclo[4.3.0]non-5-ene (DBN), 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), 2-tert-butyl-1,1,3,3-tetramethylguanidine (BTMG), and linear alcohols (methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, and 1-hexanol) in the capture of carbonyl sulfide is comprehensively and systematically investigated by density functional theory calculations at the ωB97X-D3/6-311++G(d,p) level of theory. In total, eighteen different systems as a combination of amines and alcohols are taken into account. A modified single-step, termolecular reaction mechanism among amine, alcohol, and carbonyl sulfide is considered. The findings from structural, thermodynamic, and kinetic analyses indicated that suggested reaction mechanisms for the eighteen different systems being studied are thermodynamically feasible, and the organic liquid mixture of BTMG with methanol yields the lowest energy barrier and the highest reaction rate constant in the capture of carbonyl sulfide.
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