(722f) Preparation of ZIF-8 Membranes Supported on Polymer Hollow Fibers Using Microwave-Assisted Seeding and Secondary Growth | AIChE

(722f) Preparation of ZIF-8 Membranes Supported on Polymer Hollow Fibers Using Microwave-Assisted Seeding and Secondary Growth


Lee, M. J. - Presenter, Texas A&M University
Hamid, M., Texas A&M University
Lee, J., Hanyang University
Kim, J. S., Hanyang University
Jeong, H. K., Texas A&M University

Preparation of ZIF-8 Membranes
supported on Polymer Hollow Fibers using Microwave-assisted Seeding and Secondary

Moon Joo Lee1,
Mohamad Rezi Abdul Hamid1, Jongmyeong Lee3, Ju
Sung Kim3, Young Moo Lee3 and Hae-Kwon Jeong*1,2

McFerrin Department of Chemical Engineering and 2Department of Materials
Science and Engineering, Texas A&M University, College Station, TX 77843-3122
3Department of Energy Engineering, College of Engineering, Hanyang University, Seoul 133-791, Republic of Korea

* Corresponding author: hjeong7@tamu.edu

Separation of olefin/paraffin mixtures, e.g.
propylene/propane, is one of the most
challenging separations due to the similarity of their physicochemical properties.
Currently, an energy intensive cryo-distillation process is employed. Though energy-efficient
membrane-based separation processes are drawing significant interest, no
membranes are commercially available for olefin/paraffin separations mainly due
to the limitations of current membrane materials and processing methods to
fabricate their membranes with large membrane areas.1-3

frameworks (ZIFs), a sub-class of metal-organic
frameworks (MOFs) with zeolite topology, are
highly crystalline nanoporous materials
with aperture sizes of typically less than 5 Å. ZIFs composed of metal ions (typically
Zn2+ and Co2+) and imidazole-derived organic linkers,4 have
been extensively studied for gas separation applications. Specifically, ZIF-8 is shown very promising as a new
membrane material for propylene/propane
separation because the effective pore
size is in between the size of propylene
and propane. While several ZIF-8 membranes
showed high propylene/propane separation factors, however, there are critical
issues for their commercial applications: 1) high cost of membranes and 2) low
productivities. To increase the productivity and to reduce the cost of ZIF-8
membranes, polymeric hollow fibers have been utilized
as substrates, but only a few of the
resulting ZIF-8 membranes showed promising propylene/propane separation

Herein, we would like to present a microwave-based method to prepare well inter-grown ZIF-8 membranes on
polymeric hollow fibers readily. The method is modified based on our
previously reported microwave-assisted seeding and secondary growth technique.10
Densely-packed nano-sized ZIF-8 seed crystals were rapidly prepared on either inner or outer
surface of hollow fibers under microwave heating. Subsequently, seed crystals were
secondarily grown into continuous ZIF-8 films on polyimide hollow
fibers. The thickness of the resulting ZIF-8 membranes was much smaller than
any ZIF-8 membranes grown on polymer hollow fibers reported, which are several
micrometers in thickness. The effects of synthesis parameters and fiber
morphologies on the microstructures of ZIF-8 membranes will be discussed. Finally, the gas separation
performances of ZIF-8 membranes will be

References and Notes

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of Membrane Science
, 121, pp 197-207

Park KS, Ni Z, Côté AP, et al., (2006) “Exceptional
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5 Zhang C, Lively RP, Zhang K, Johnson JR, Karvan O, Koros
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6 Andrew J. Brown, Nicholas A. Brunelli, Kiwon Eum,
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7 FernandoCacho-Bailo, SilviaCatalán-Aguirre,
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8 Kiwon Eum, Chen Ma, Ali Rownaghi, Christopher W.
Jones, and Sankar Nair (2016) “ZIF‑8 Membranes via Interfacial Microfluidic Processing in
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9 Anne M. Marti, Wasala Wickramanayake, Ganpat Dahe,
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(2017) “Continuous Flow Processing of ZIF‑8 Membranes on Polymeric Porous Hollow Fiber Supports
for CO2 Capture”, ACS Applied materials
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9, pp 5678-5682

Kwon HT, Jeong H-K., (2013), “Highly
propylene-selective supported zeolite-imidazolate framework
(ZIF-8) membranes synthesized by rapid microwave-assisted seeding and secondary
growth”, Chemical Communications, 49, pp 3854-3856