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Study on Gas Permeation and CO2 Separation through Ionic Liquid Based Membranes with Siloxane-Functionalized Cations

Title: Study on Gas Permeation and CO2 Separation through Ionic Liquid Based Membranes with Siloxane-Functionalized Cations
Authors: Tome, LC
Gouveia, ASL
Ab Ranii, MA
Lickiss, PD
Welton, T
Marrucho, IM
Item Type: Journal Article
Abstract: This work explores ionic liquid-based membranes with siloxane functionalized cations using two different approaches: supported ionic liquid membranes (SILMs) and poly(ionic liquid)–ionic liquid (PIL–IL) composite membranes. Their CO2, CH4, and N2 permeation properties were measured at T = 293 K with a trans-membrane pressure differential of 100 kPa. The thermophysical properties of the synthesized siloxane-functionalized ILs, namely viscosity and density (data in the Supporting Information), were also determined. Contrary to what was expected, the gas permeation results show that the SILMs containing siloxane-functionalized cations have CO2 permeabilities that are lower than those of their analogues without the siloxane functionality. The addition of siloxane-based ILs into PILs increases both CO2 permeability and CO2/N2 permselectivity, although it does not significantly change the CO2/CH4 permselectivity. The prepared membranes present very diverse CO2 permeabilities, between 57 and 568 Barrer, while they show permselectivities varying from 16.8 to 36.8 for CO2/N2 and from 9.8 to 11.5 for CO2/CH4. As observed for other ILs, superior CO2 separation performances were obtained when the IL containing [C(CN)3]− is used compared to that having the [NTf2]− anion.
Issue Date: 2-Feb-2017
Date of Acceptance: 2-Feb-2017
URI: http://hdl.handle.net/10044/1/49760
DOI: https://dx.doi.org/10.1021/acs.iecr.6b04661
ISSN: 0888-5885
Publisher: American Chemical Society
Start Page: 2229
End Page: 2239
Journal / Book Title: Industrial & Engineering Chemistry Research
Volume: 56
Issue: 8
Copyright Statement: © 2017 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Industrial & Engineering Chemistry Research, after peer review and technical editing by the publisher. To access the final edited and published work see https://dx.doi.org/10.1021/acs.iecr.6b04661
Keywords: Science & Technology
Technology
Engineering, Chemical
Engineering
COMPOSITE MEMBRANES
FACILITATED TRANSPORT
POLY(IONIC LIQUID)S
CO2/N-2 SEPARATION
GEL MEMBRANES
PERFORMANCE
CAPTURE
IMIDAZOLIUM
ANION
PERMEABILITY
09 Engineering
03 Chemical Sciences
Chemical Engineering
Publication Status: Published
Appears in Collections:Chemistry
Catalysis and Advanced Materials
Faculty of Natural Sciences



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