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3D Graphene as an Unconventional Support Material for Ionic Liquid Membranes: Computational Insights into Gas Separations

Cite this: Ind. Eng. Chem. Res. 2020, 59, 5, 2203–2210
Publication Date (Web):January 24, 2020
https://doi.org/10.1021/acs.iecr.9b05475
Copyright © 2020 American Chemical Society

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    Abstract

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    Three-dimensional graphene (3DGr) is explored as an unconventional support material for supported ionic liquid membranes (SILMs) in gas separations. Herein, molecular dynamics/grand canonical Monte Carlo (MD/GCMC) simulations were performed to investigate the CO2/CH4 separation performance in porous 3DGr and 3DGr-supported IL ([EMIM][TF2N]) membranes as a function of pressure and IL loading in the 3DGr-IL membrane. Bulk ionic liquid (IL) was treated as a control. Calculations of ratios of Henry’s law constants in single-gas simulations and CO2/CH4 membrane selectivities in mixed-gas (1:1 molar ratio) simulations as a function of pressure reveal promising gas separation performance for 3DGr-supported IL (3DGr-IL) membranes. For example, a selectivity of about 24 is observed for the 3DGr-IL membrane with 23 wt % IL loading at high pressures (>3 bar), exceeding the separation performance of bulk IL. Given the excellent mechanical properties of 3DGr, it is demonstrated that it may be used as a mechanically robust support for IL membranes with excellent CO2/CH4 separation performance.

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    This article is cited by 11 publications.

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