Molecular dynamics simulations are used to study the transport of CO 2, H 2 S and CH 4 molecules across environmentally friendly choline-benzoate and choline-lactate ionic liquids (ILs). The permeability coefficients of the considered molecules are calculated using the free energy and diffusion rate profiles. Both systems show the largest resistance to CH 4, whereas more than 5 orders of magnitude larger permeability coefficients are obtained for the other two gas molecules. The CO 2/CH 4 and H 2 S/CH 4 selectivity was estimated to be more than 10 4 and 10 5, respectively. These results indicate the great potential of the considered ILs for greenhouse gas control.

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