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Title: Supported bicyclic amidine ionic liquids as a potential CO2/N2 separation medium

Abstract

In this paper, five new room temperature ionic liquids were tested as supported ionic liquid membranes (SILMs) for CO2/N2 separation capability. This series of ionic liquids (ILs) contains bicyclic amidine cations of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) or 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) with small alkyl chain substituents. These ILs have been synthesized to examine the effects of cation structure on free volume. Relevant physical and chemical properties have been examined, including CO2 solubility and viscosity. The relationship between fractional free volume and permeability of gases is explored, with an interesting note on solubility. Each cation was paired with two different anions: bis(trifluoromethanesulfonyl)imide and tetracyanoborate, for further investigation of the cation-anion interaction on SILM permeability and selectivity. Finally, three of these new ILs have exceeded Robeson's upper bound for CO2/N2 gas separations.

Authors:
 [1]; ORCiD logo [1];  [2];  [3];  [3]; ORCiD logo [3];  [4]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry. Joint Inst. for Advanced Materials
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
  3. Univ. of California, Riverside, CA (United States). Dept. of Chemistry
  4. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry. Joint Inst. for Advanced Materials; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1468162
Alternate Identifier(s):
OSTI ID: 1693501
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Membrane Science
Additional Journal Information:
Journal Volume: 565; Journal ID: ISSN 0376-7388
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; ionic liquid; carbon dioxide; free volume; SILM

Citation Formats

Schott, Jennifer A., Do-Thanh, Chi-Linh, Mahurin, Shannon M., Tian, Ziqi, Onishi, Nicole C., Jiang, De-en, and Dai, Sheng. Supported bicyclic amidine ionic liquids as a potential CO2/N2 separation medium. United States: N. p., 2018. Web. doi:10.1016/j.memsci.2018.08.012.
Schott, Jennifer A., Do-Thanh, Chi-Linh, Mahurin, Shannon M., Tian, Ziqi, Onishi, Nicole C., Jiang, De-en, & Dai, Sheng. Supported bicyclic amidine ionic liquids as a potential CO2/N2 separation medium. United States. https://doi.org/10.1016/j.memsci.2018.08.012
Schott, Jennifer A., Do-Thanh, Chi-Linh, Mahurin, Shannon M., Tian, Ziqi, Onishi, Nicole C., Jiang, De-en, and Dai, Sheng. Tue . "Supported bicyclic amidine ionic liquids as a potential CO2/N2 separation medium". United States. https://doi.org/10.1016/j.memsci.2018.08.012. https://www.osti.gov/servlets/purl/1468162.
@article{osti_1468162,
title = {Supported bicyclic amidine ionic liquids as a potential CO2/N2 separation medium},
author = {Schott, Jennifer A. and Do-Thanh, Chi-Linh and Mahurin, Shannon M. and Tian, Ziqi and Onishi, Nicole C. and Jiang, De-en and Dai, Sheng},
abstractNote = {In this paper, five new room temperature ionic liquids were tested as supported ionic liquid membranes (SILMs) for CO2/N2 separation capability. This series of ionic liquids (ILs) contains bicyclic amidine cations of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) or 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) with small alkyl chain substituents. These ILs have been synthesized to examine the effects of cation structure on free volume. Relevant physical and chemical properties have been examined, including CO2 solubility and viscosity. The relationship between fractional free volume and permeability of gases is explored, with an interesting note on solubility. Each cation was paired with two different anions: bis(trifluoromethanesulfonyl)imide and tetracyanoborate, for further investigation of the cation-anion interaction on SILM permeability and selectivity. Finally, three of these new ILs have exceeded Robeson's upper bound for CO2/N2 gas separations.},
doi = {10.1016/j.memsci.2018.08.012},
journal = {Journal of Membrane Science},
number = ,
volume = 565,
place = {United States},
year = {2018},
month = {8}
}

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