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Issue 12, 2013
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Effect of alkyl and aryl substitutions on 1,2,4-triazolium-based ionic liquids for carbon dioxide separation and capture

Patrick C. Hillesheim,a  Joseph A. Singh,a  Shannon M. Mahurin,*a  Pasquale F. Fulvio,a  Yatsandra Oyola,a  Xiang Zhu,b  De-en Jianga  and  Sheng Dai*ab 
Author affiliations

* Corresponding authors

a Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, USA
E-mail: mahurinsm@ornl.gov

b Department of Chemistry, University of Tennessee, Knoxville, USA
E-mail: dais@ornl.gov

Abstract

A series of 1,2,4-triazolium-based ionic liquids have been synthesized and evaluated for their use in supported ionic liquid membrane based CO2 separations. The properties of these triazolium-based compounds have proven sensitive to isomeric substitutions, such as isopropyl and propyl groups, as well as ortho and para substitutions in the aryl derivative compounds. While physical properties such as viscosity did not vary significantly between structural isomers, the CO2 permeability, selectivity, and solubility exhibited significant changes allowing for development of task-specific triazolium-based ionic liquids for separation applications. COSMOtherm studies were also completed to gain a better understanding of the ionic liquids which demonstrated a strong correlation between experimental and computational values for the alkyl bearing ionic liquids. Hence, 1,2,4-triazolium-based liquids comprise a class of compounds offering unique opportunities to examine how structural changes affect the physicochemical properties which are necessary for the continuous development of ionic liquids with enhanced adsorption capacity and selectivity in separations.

Graphical abstract: Effect of alkyl and aryl substitutions on 1,2,4-triazolium-based ionic liquids for carbon dioxide separation and capture

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Publication details

The article was received on 25 Oct 2012, accepted on 21 Dec 2012 and first published on 21 Dec 2012


Article type: Paper
DOI: 10.1039/C2RA22646D
Citation: RSC Adv., 2013,3, 3981-3989
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    Effect of alkyl and aryl substitutions on 1,2,4-triazolium-based ionic liquids for carbon dioxide separation and capture

    P. C. Hillesheim, J. A. Singh, S. M. Mahurin, P. F. Fulvio, Y. Oyola, X. Zhu, D. Jiang and S. Dai, RSC Adv., 2013, 3, 3981
    DOI: 10.1039/C2RA22646D

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