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Issue 44, 2018
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Effect of methylation of ionic liquids on the gas separation performance of ionic liquid/metal–organic framework composites

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Abstract

1-N-Butyl-3-methylimidazolium hexafluorophosphate, [BMIM][PF6], and its methylated form, 1-N-butyl-2,3-dimethylimidazolium hexafluorophosphate, [BMMIM][PF6], were incorporated into CuBTC to examine the effect of methylation of ionic liquids (ILs) on the gas separation performance of the corresponding IL/metal–organic framework (MOF) composites. Spectroscopic analysis revealed that the interactions of the methylated ILs with CuBTC were weaker compared to those of its non-methylated counterpart. Gas uptake measurements illustrated that this difference in the interactions influences the gas separation performance of the composites. Accordingly, the CO2/N2: 15/85 and CH4/N2: 50/50 selectivities increased by 37% and 60% for [BMMIM][PF6]/CuBTC and 34% and 50% for [BMIM][PF6]/CuBTC, respectively, compared to the corresponding selectivities of pristine CuBTC at 1000 mbar. The results revealed another structural parameter controlling the performance of the IL/MOF composites, a novel type of material with rapidly expanding application areas.

Graphical abstract: Effect of methylation of ionic liquids on the gas separation performance of ionic liquid/metal–organic framework composites

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Publication details

The article was received on 13 Aug 2018, accepted on 28 Sep 2018 and first published on 17 Oct 2018


Article type: Paper
DOI: 10.1039/C8CE01364K
CrystEngComm, 2018,20, 7137-7143
  • Open access: Creative Commons BY-NC license
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    Effect of methylation of ionic liquids on the gas separation performance of ionic liquid/metal–organic framework composites

    V. Nozari, M. Zeeshan, S. Keskin and A. Uzun, CrystEngComm, 2018, 20, 7137
    DOI: 10.1039/C8CE01364K

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