Abstract
CH4/N2 separation is one of the most challenging gas separation tasks and plays a significant role in the global warming hiatus. Membrane-based separation is a promising method for industrial applications but has been limited by its poor CH4/N2 selectivity. Therefore, an ionic liquid with excellent differential binding properties to CH4 and N2 is required for this study. [P(14)666][TMPP] (bis (2,4,4 trimethylpentyl) phosphinate, trihexyl (tetradecyl) phosphanium) was selected from 26 ionic liquids (ILs) to prepare IL-polymer membranes (ILPMs). It led to a 57.9 % increase in CH4/N2 selectivity of 7.31 and a 2539.9 % increase in CH4 permeability of 128.3 barrer compared with neat membrane. DFT simulations reveal that the facilitated transfer mechanism could enhance CH4/N2 separation. This study also shows that (1) the C-H···O forms hydrogen bonding (HB); (2) the differences of CH4 and N2 in geometry and electrostatic potential (ESP) distribution lead to different steric hindrance effects that could be the decisive factor for the outstanding performance of prepared ILPMs in this study.
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