|Title:||Facile Defect Engineering of Zeolitic Imidazolate Frameworks towards Enhanced C<inf>3</inf>H<inf>6</inf>/C<inf>3</inf>H<inf>8</inf> Separation Performance||Authors:||An, Heseong
Cho, Kie Yong
Chiou, Da Shiuan
Nam, Ki Jin
Lin, Li Chiang
Lee, Jong Suk
|Keywords:||amine modulator | defect engineering | mixed matrix membrane | propylene/propane gas separation | zeolitic imidazolate framework;amine modulator; defect engineering; mixed matrix membrane; propylene/propane gas separation; zeolitic imidazolate framework||Issue Date:||1-Jan-2021||Source:||Advanced Functional Materials||Abstract:||
Membrane-based olefin/paraffin separations can be an attractive alternative to the current energy-intensive cryogenic distillation for their high energy efficiency. This paper reports an amine modulator-induced defect engineering of zeolitic imidazolate framework-8 (AZIF8) nanoparticles (60 nm) for enhanced molecular sieving ability and good compatibility with various polymer matrices. It is revealed that an initial suppression of nuclei formation during synthesis enables amine modulators to deprotonate the neutral organic ligand as well as coordinate with Zn2+ ions. The resulting AZIF8s exhibit more rigid characteristics compared to the conventional ZIF-8 counterparts as demonstrated by its delayed gate opening pressure. Molecular dynamics simulations also suggest that AZIF8s exhibit a narrower pore size distribution with a smaller opening compared to the conventional ZIF-8 analogues, which makes them more suitable for size-discrimination between C3H6 and C3H8. Furthermore, the coordination of alkyl amines into frameworks allows excellent compatibility with various commercial polymer matrices. The highly concentrated 6FDA-DAM/AZIF8 (50/50 w/w) mixed matrix membrane (MMM) exhibits superior C3H6/C3H8 separation performance (C3H6 permeability of 79.38 Barrer and C3H6/C3H8 selectivity of 39.8 at single gas condition) to most existing MMMs. The structural engineering proposed herein can be applied to other metal–organic frameworks for optimizing their performance in molecular separations.
|URI:||https://scholars.lib.ntu.edu.tw/handle/123456789/583415||ISSN:||1616301X||DOI:||10.1002/adfm.202105577||metadata.dc.subject.other:||Amines; Chelation; Defects; Distillation; Energy efficiency; Modulators; Molecular dynamics; Pore size; Cryogenic distillations; High energy efficiency; Mixed matrix membranes; Molecular dynamics simulations; Olefin/paraffin separations; Separation performance; Zeolitic imidazolate framework-8; Zeolitic imidazolate frameworks; Gas permeable membranes
|Appears in Collections:||化學工程學系|
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