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An Extrinsic-Pore-Containing Molecular Sieve Film: A Robust, High-Throughput Membrane Filter

Authors
Hong, SungwonJeong, YanghwanBaik, HionsuckChoi, NakwonYip, Alex C. K.Choi, Jungkyu
Issue Date
18-1월-2021
Publisher
WILEY-V C H VERLAG GMBH
Keywords
MFI type zeolite membranes; defect-free membranes; hierarchical porous structure; non-zeolitic-pore-containing film; o-xylene separations; p-
Citation
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.60, no.3, pp.1323 - 1331
Indexed
SCIE
SCOPUS
Journal Title
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume
60
Number
3
Start Page
1323
End Page
1331
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/137805
DOI
10.1002/anie.202010957
ISSN
1433-7851
Abstract
MFI type zeolites with 10-membered-ring pores (ca. 0.55 nm) have the ability to separate p-xylene (ca. 0.58 nm) from its bulkier isomers. Here, we introduced non-zeolitic micropores (ca. 0.6-1.5 nm) and mesopores (ca. 2-7 nm) to a conventional microporous MFI type zeolite membrane, yielding an unprecedented hierarchical membrane structure. The uniform, embedded non-zeolitic pores decreased defect formation considerably and facilitated molecular transport, resulting in high p-xylene perm-selectivity and molar flux. Specifically, compared to a conventional, crack network-containing MFI membranes of similar thickness (ca. 1 mu m), the mesoporous MFI membranes showed almost double p-xylene permeance (ca. 1.6 +/- 0.4x10(-7) mol m(-2) s(-1) Pa-1) and a high p-/o-xylene separation factor (ca. 53.8 +/- 7.3 vs. 3.5 +/- 0.5 in the conventional MFI membrane) at 225 degrees C. The embedded non-zeolitic pores allowed for decreasing the separation performance degradation, which was apparently related to coke formation.
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공과대학 (화공생명공학과)
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