ZIF‐8 Membrane Separation Performance Tuning by Vapor Phase Ligand Treatment
[1];
[2];
[3];
[4]
- Department of Chemical Engineering and Materials Science University of Minnesota 421 Washington Ave. SE Minneapolis MN 55455-0132 USA
- Department of Chemical Engineering and Materials Science University of Minnesota 421 Washington Ave. SE Minneapolis MN 55455-0132 USA, Science &, Innovation Center Mitsubishi Chemical Corporation 1000 Kamoshida-cho, Aoba-ku Yokohama-shi Kanagawa 227-8502 Japan, Department of Chemical and Biomolecular Engineering &, Institute for NanoBioTechnology Johns Hopkins University 3400 N. Charles Street Baltimore MD 21218 USA
- Department of Chemical Engineering Pukyong National University 45 Yongso-ro, Nam-gu Busan 48513 South Korea
- Department of Chemical Engineering and Materials Science University of Minnesota 421 Washington Ave. SE Minneapolis MN 55455-0132 USA, Department of Chemical and Biomolecular Engineering &, Institute for NanoBioTechnology Johns Hopkins University 3400 N. Charles Street Baltimore MD 21218 USA, Applied Physics Laboratory Johns Hopkins University 11100 Johns Hopkins Road Laurel MB 20723 USA
Abstract Vapor phase ligand treatment (VPLT) of 2‐aminobenzimidazole (2abIm) for 2‐methylimidazole (2mIm) in ZIF‐8 membranes prepared by two different methods (LIPS: ligand induced permselectivation and RTD: rapid thermal deposition) results in a notable shift of the molecular level cut‐off to smaller molecules establishing selectivity improvements from ca. 1.8 to 5 for O 2 /N 2 ; 2.2 to 32 for CO 2 /CH 4 ; 2.4 to 24 for CO 2 /N 2 ; 4.8 to 140 for H 2 /CH 4 and 5.2 to 126 for H 2 /N 2 . Stable (based on a one‐week test) oxygen‐selective air separation performance at ambient temperature, 7 bar(a) feed, and 1 bar(a) sweep‐free permeate with a mixture separation factor of 4.5 and oxygen flux of 2.6×10 −3 mol m −2 s −1 is established. LIPS and RTD membranes exhibit fast and gradual evolution upon a 2abIm‐VPLT, respectively, reflecting differences in their thickness and microstructure. Functional reversibility is demonstrated by showing that the original permeation properties of the VPLT‐LIPS membranes can be recovered upon 2mIm‐VPLT.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- SC0001015
- OSTI ID:
- 1567896
- Journal Information:
- Angewandte Chemie, Journal Name: Angewandte Chemie Vol. 131 Journal Issue: 46; ISSN 0044-8249
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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