Ion-gated carbon molecular sieve gas separation membranes

Wei Guo; Shannon M. Mahurin; Song Wang; Harry M. Meyer; Huimin Luo; Xunxiang Hu; De en Jiang; Sheng Dai

doi:10.1016/j.memsci.2020.118013

Ion-gated carbon molecular sieve gas separation membranes

Wei Guo, Shannon M. Mahurin, Song Wang, Harry M. Meyer, Huimin Luo, Xunxiang Hu, De en Jiang, Sheng Dai

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

Membrane technology lies at the heart of many industrial gas separation processes and applications. Molecular sieving membranes that break the Robeson limit are desirable for energy-efficient gas separation. Herein, we report a facile strategy of directly integrating ionic liquids (ILs) into porous membranes. Particularly, the ILs form an ultra-thin layer on the carbon molecular sieve (CMS) membranes rather than penetrating into the pores, acting as a smart gate for gas entry to boost the selectivity. The hybrid membrane exhibits CO₂ permeability >600 barrer and enhanced CO₂/N₂ selectivity >50, which surpasses the Robeson limit and shows potential in CO₂/N₂ separation process. Molecular dynamics simulations confirm the gating effect of the IL layer of molecular thickness. This work demonstrates a universal strategy to improve CMS membrane performance by creating an IL-membrane interface and tuning the ion-pore interaction.

Original language	English
Article number	118013
Journal	Journal of Membrane Science
Volume	604
DOIs	https://doi.org/10.1016/j.memsci.2020.118013
State	Published - Jun 1 2020

Funding

The research was supported financially by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy under contract no. DE-AC05-00OR22725. This research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under contract no. DE-AC02-05CH11231. The research was supported financially by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy under contract no. DE-AC05-00OR22725 . This research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under contract no. DE-AC02-05CH11231 .

Keywords

Carbon molecular sieve
Gas separation
Ionic liquid
Molecular dynamic simulation
Robeson limit

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.memsci.2020.118013

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title = "Ion-gated carbon molecular sieve gas separation membranes",

abstract = "Membrane technology lies at the heart of many industrial gas separation processes and applications. Molecular sieving membranes that break the Robeson limit are desirable for energy-efficient gas separation. Herein, we report a facile strategy of directly integrating ionic liquids (ILs) into porous membranes. Particularly, the ILs form an ultra-thin layer on the carbon molecular sieve (CMS) membranes rather than penetrating into the pores, acting as a smart gate for gas entry to boost the selectivity. The hybrid membrane exhibits CO2 permeability >600 barrer and enhanced CO2/N2 selectivity >50, which surpasses the Robeson limit and shows potential in CO2/N2 separation process. Molecular dynamics simulations confirm the gating effect of the IL layer of molecular thickness. This work demonstrates a universal strategy to improve CMS membrane performance by creating an IL-membrane interface and tuning the ion-pore interaction.",

keywords = "Carbon molecular sieve, Gas separation, Ionic liquid, Molecular dynamic simulation, Robeson limit",

author = "Wei Guo and Mahurin, {Shannon M.} and Song Wang and Meyer, {Harry M.} and Huimin Luo and Xunxiang Hu and Jiang, {De en} and Sheng Dai",

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T1 - Ion-gated carbon molecular sieve gas separation membranes

AU - Guo, Wei

AU - Mahurin, Shannon M.

AU - Wang, Song

AU - Meyer, Harry M.

AU - Luo, Huimin

AU - Hu, Xunxiang

AU - Jiang, De en

AU - Dai, Sheng

PY - 2020/6/1

Y1 - 2020/6/1

N2 - Membrane technology lies at the heart of many industrial gas separation processes and applications. Molecular sieving membranes that break the Robeson limit are desirable for energy-efficient gas separation. Herein, we report a facile strategy of directly integrating ionic liquids (ILs) into porous membranes. Particularly, the ILs form an ultra-thin layer on the carbon molecular sieve (CMS) membranes rather than penetrating into the pores, acting as a smart gate for gas entry to boost the selectivity. The hybrid membrane exhibits CO2 permeability >600 barrer and enhanced CO2/N2 selectivity >50, which surpasses the Robeson limit and shows potential in CO2/N2 separation process. Molecular dynamics simulations confirm the gating effect of the IL layer of molecular thickness. This work demonstrates a universal strategy to improve CMS membrane performance by creating an IL-membrane interface and tuning the ion-pore interaction.

AB - Membrane technology lies at the heart of many industrial gas separation processes and applications. Molecular sieving membranes that break the Robeson limit are desirable for energy-efficient gas separation. Herein, we report a facile strategy of directly integrating ionic liquids (ILs) into porous membranes. Particularly, the ILs form an ultra-thin layer on the carbon molecular sieve (CMS) membranes rather than penetrating into the pores, acting as a smart gate for gas entry to boost the selectivity. The hybrid membrane exhibits CO2 permeability >600 barrer and enhanced CO2/N2 selectivity >50, which surpasses the Robeson limit and shows potential in CO2/N2 separation process. Molecular dynamics simulations confirm the gating effect of the IL layer of molecular thickness. This work demonstrates a universal strategy to improve CMS membrane performance by creating an IL-membrane interface and tuning the ion-pore interaction.

KW - Carbon molecular sieve

KW - Gas separation

KW - Ionic liquid

KW - Molecular dynamic simulation

KW - Robeson limit

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DO - 10.1016/j.memsci.2020.118013

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VL - 604

JO - Journal of Membrane Science

JF - Journal of Membrane Science

M1 - 118013

ER -

Ion-gated carbon molecular sieve gas separation membranes

Abstract

Funding

Keywords

UN SDGs

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