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Title: Creation of Well-Defined “Mid-Sized” Micropores in Carbon Molecular Sieve Membranes

Journal Article · · Angewandte Chemie (International Edition)

Carbon molecular sieve (CMS) membranes are choices for the separation of organic molecules due to their stability, ability to be scaled at practical form factors, and the avoidance of expensive supports or complex multi-step fabrication processes. A critical challenge is the creation of “mid-range” (e.g., 5–9 Å) microstructures that allow for facile permeation of organic solvents and selection between similarly-sized guest molecules. In this work, we create these microstructures via the pyrolysis of a microporous polymer (PIM-1) under low concentrations of hydrogen gas. The introduction of H2 inhibits aromatization of the decomposing polymer and ultimately results in the creation of a well-defined bimodal pore network that exhibits an ultramicropore size of 5.1 Å. The H2 assisted CMS dense membranes show a dramatic increase in p-xylene ideal permeability (≈15 times), with little loss in p-xylene/o-xylene selectivity (18.8 vs. 25.0) when compared to PIM-1 membranes pyrolyzed under a pure argon atmosphere. This method is successfully extended to hollow fiber membranes operating in organic solvent reverse osmosis mode, highlighting the potential of this approach to be translated from the laboratory to the field.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); ExxonMobil Research and Engineering
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1566018
Report Number(s):
LLNL-JRNL-769201; 960479
Journal Information:
Angewandte Chemie (International Edition), Vol. 58, Issue 38; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 48 works
Citation information provided by
Web of Science

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