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

Title
An Extrinsic-Pore-Containing Molecular Sieve Film: A Robust, High-Throughput Membrane Filter
Authors
최낙원홍성원정양환Hionsuck BaikAlex C. K. Yip최정규
Issue Date
2021-01
Publisher
Angewandte Chemie international edition
Citation
VOL 60, NO 3-1331
Abstract
MFI type zeolites with 10­membered­ring pores (ca. 0.55?nm) have the ability to separate p­xylene (ca. 0.58?nm) from its bulkier isomers. Here, we introduced non­zeolitic 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 non­zeolitic pores decreased defect formation considerably and facilitated molecular transport, resulting in high p­xylene perm­selectivity and molar flux. Specifically, compared to a conventional, crack network­containing MFI membranes of similar thickness (ca. 1?μm), the mesoporous MFI membranes showed almost double p­xylene permeance (ca. 1.6±0.4×10?7?mol?m?2?s?1?Pa?1) and a high p­/o­xylene separation factor (ca. 53.8±7.3 vs. 3.5±0.5 in the conventional MFI membrane) at 225?°C. The embedded non­zeolitic pores allowed for decreasing the separation performance degradation, which was apparently related to coke formation.
URI
http://pubs.kist.re.kr/handle/201004/72518
ISSN
1433-7851
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