Premium
Delayed Linker Addition (DLA) Synthesis for Hybrid SOD ZIFs with Unsubstituted Imidazolate Linkers for Propylene/Propane and n‐Butane/i‐Butane Separations
Author(s) -
Hillman Febrian,
Hamid Mohamad Rezi Abdul,
Krokidas Panagiotis,
Moncho Salvador,
Brothers Edward N.,
Economou Ioannis G.,
Jeong HaeKwon
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202015635
Subject(s) - propane , butane , linker , zeolitic imidazolate framework , imidazolate , materials science , selectivity , topology (electrical circuits) , combinatorial chemistry , metal organic framework , membrane , chemical engineering , chemistry , organic chemistry , computer science , catalysis , mathematics , adsorption , combinatorics , engineering , operating system , biochemistry
We present a novel synthesis strategy termed delayed linker addition (DLA) to synthesize hybrid zeolitic‐imidazolate frameworks containing unsubstituted imidazolate linkers (Im) with SOD topology (hereafter termed Im/ZIF‐8). Im linker incorporation can create larger voids and apertures, which are important properties for gas storage and separation. To date, there have been only a handful of reports of Im linkers incorporated into ZIF‐8 frameworks, typically requiring arduous and complicated post synthesis approaches. DLA, as reported here, is a simple one‐step synthesis strategy allowing high incorporation of Im linker into the ZIF‐8 framework while still retaining its SOD topology. We fabricated mixed‐matrix membranes (MMMs) with 6FDA‐DAM polymer and Im/ZIF‐8 obtained via DLA as a filler. The Im/ZIF‐8‐containing MMMs showed excellent performance for both propylene/propane and n‐butane/i‐butane separation, displaying permeability and ideal selectivity well above the polymer upper bound. Moreover, highly detailed molecular simulations shed light to the aperture size and flexibility response of Im/ZIF‐8 and its improved diffusivity as compared to ZIF‐8.