Impact on CO2/N2 and CO2/CH4 Separation Performance Using Cu-BTC with Supported Ionic Liquids-Based Mixed Matrix Membranes

Abstract

The efficient separation of gases has industrial, economic, and environmental importance. Here, we report the improvement in gas separation performance of a polyimide-based matrix (Matrimid®5218) filled with a Cu-based metal organic framework [MOF, Cu3(BTC)2] with two different ionic liquids (ILs) confined within the pores. The chosen ILs are commonly used in gas solubilization, 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]) and 1-Ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM][OTf]), and the incorporation of the [EMIM][BF4]@Cu-BTC and [EMIM][OTf]@Cu-BTC composites in Matrimid®5218 proved to be an efficient strategy to improve the permeability and selectivity toward CO2/N2 and CO2/CH4 mixtures.

Photothermal‐Responsive Microporous Nanosheets Confined Ionic Liquid for Efficient CO2 Separation

“…[ 29 ] Fortunately, 2D metal‐organic framework (MOF), the novel porous material with abundant of in‐plane pores has attracted our attention and been deemed as an ideal alternative to fabricate SILM with enhanced gas separation efficiency. [ 30,31 ] However, only several trials have been attempted in bulk MOF membrane supported ionic liquid [ 32,33 ] or MOF particles supported ionic liquid in mixed matrix membranes [ 34,35 ] for enhanced gas separation performance.…”

Overview of Membrane Science and Technology in Portugal

“…Remarkable CO 2 solubility and tunability are essential features of this unique platform. The potential of ionic liquid materials to improve membranebased CO 2 separation processes has been demonstrated, either through the preparation of supported ionic liquid membranes (SILMs) [45,[187][188][189][190][191][192][193][194][195][196][197][198], the blending of ionic liquids with poly(ionic liquid)s [199][200][201][202][203][204][205][206][207][208] or, more recently, through the development of mixed matrix membranes [209][210][211][212][213][214].…”

“…Considerable improvements in CO 2 , N 2, and H 2 permeabilities were achieved for irradiated PIL/IL membranes, while their CO 2 /N 2 and CO 2 /H 2 selectivities were almost unchanged. Mixed matrix membranes combining metal-organic frameworks (MOFs) [209][210][211][212] or graphene [213,214] have also been investigated. As an example, Nabais et al [209] incorporated different MOFs (MIL-53(Al), Cu 3 (BTC) 2 , and ZIF-8) into a pyrrolidinium-based PIL/IL (60/40 wt.%).…”

Impact of Ionic Liquid Structure and Loading on Gas Sorption and Permeation for ZIF-8-Based Composites and Mixed Matrix Membranes

“…A higher amount of IL inside the ZIF-8 framework led to a gradual decrease in CO 2 permeability, whereas the selectivity towards N 2 reached a plateau. Fluorinecontaining ILs have been the most used for these different approaches due to their affinity towards CO 2 , especially those including the anions bis(trifluoromethanesulfonyl)imide ([Tf 2 N] − ) [18,20,35], tetrafluoroborate ([BF 4 ] − ) [21,[35][36][37], and triflate ([OTf] − ) [38]. While these anions have also reported interesting results, the impact of the IL properties on the separation performance has not been systematically discussed for IL@ZIF-8 MMMs.…”