Polymeric ionic liquid-based membranes: Influence of polycation variation on gas transport and CO2 selectivity properties
authors Tome, LC; Gouveia, ASL; Freire, CSR; Mecerreyes, D; Marrucho, IM
nationality International
journal JOURNAL OF MEMBRANE SCIENCE
author keywords Polymeric ionic liquids; Ionic liquids; Composite membranes; Gas transport; CO2/CH4 and CO2/N-2 separation
keywords CARBON-DIOXIDE SEPARATION; COMPOSITE MEMBRANES; FLUE-GAS; FACILITATED TRANSPORT; POLY(IONIC LIQUID)S; COPOLYMER MEMBRANES; GEL MEMBRANES; PERFORMANCE; CAPTURE; PERMEATION
abstract This work evaluates the CO2, CH4 and N-2 permeation properties of five novel composite membranes based on polymeric ionic liquids (Pits) having different cation pendant units, namely imidazolium, pyridinium, pyrrolidinium, ammonium and cholinium, combined with the same counter anion ([NTf2](-)). The results show that the CO2 permeability in the composite membranes is related to their respective CO2 diffusivities, which are dependent on the PIL polycaLion nature. The composite membranes of the PILs containing different polycations and 10 wL% of free ionic liquid (IL) with similar structures to each PIL monomeric unit have CO2 permeabililies between 3.66 and 20.4 Barrer, while they exhibit permselectivities ranging from 28.3 to 43.0 for CO2/CH4 and from 25.8 to 34.7 for CO2/N-2. The best CO2 permselectivities were obtained when tetra alkyl ammonium based [Us (pyrrolidinium, ammonium and cholinium) are used rather than imidazolium or pyridinium. Also, the results of this work indicate that the polycation backbones of PILs can also play a significant role in the design of PIL-IL membranes with the finest gas permeation properties and improved CO2 separation performances. (C) 2015 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0376-7388
year published 2015
volume 486
beginning page 40
ending page 48
digital object identifier (doi) 10.1016/j.memsci.2015.03.026
web of science category Engineering, Chemical; Polymer Science
subject category Engineering; Polymer Science
unique article identifier WOS:000353480700005
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journal analysis (jcr 2019):
journal impact factor 7.183
5 year journal impact factor 7.158
category normalized journal impact factor percentile 95.274
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