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Confined Ionic Liquid in an Ionic Porous Aromatic Framework for Gas Separation

Journal Article · · ACS Applied Polymer Materials
 [1];  [2];  [3]
  1. Chinese Academy of Sciences, Ningbo (China); Univ. of California, Riverside, CA (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of California, Riverside, CA (United States)

Ionic liquids (ILs) and porous frameworks are commonly employed in gas separation, but rarely together. To leverage their combined advantages, we designed a novel system comprising an ionic liquid inside a charged porous-polymer framework. A positively charged ionic porous aromatic framework was impregnated with an ionic liquid to confine the cations and anions inside the polymeric framework via electrostatic interactions. Molecular dynamics and free energy simulations were performed to determine the solubility, diffusivity, and hence permeability of CO2 and CH4 through the composite material. We found that the polymeric framework introduces nanoscale space in the confined IL, improving gas solubility, while the IL promotes gas transport in the porous structure. Here, the confinement impacts CO2 and CH4 very differently regarding their solubility and diffusivity. Through tuning of the ionic-liquid loading, both high CO2 permeability and high CO2/CH4 selectivity could be achieved, overcoming the Robeson upper bound. This work highlights the advantages of confined ionic liquids in an ionic porous-polymer framework in enhancing selective gas separation.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231
OSTI ID:
1855702
Journal Information:
ACS Applied Polymer Materials, Journal Name: ACS Applied Polymer Materials Journal Issue: 1 Vol. 1; ISSN 2637-6105
Publisher:
ACS PublicationsCopyright Statement
Country of Publication:
United States
Language:
English

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