New Insights into Physical Aging-Induced Structure Evolution in Carbon Molecular Sieve Membranes

Liu, Zhongyun; Qiu, Wulin; Koros, William J.

doi:10.1002/anie.202210831

New Insights into Physical Aging-Induced Structure Evolution in Carbon Molecular Sieve Membranes

Journal Article · Mon Sep 12 00:00:00 EDT 2022 · Angewandte Chemie (International Edition)

DOI:https://doi.org/10.1002/anie.202210831· OSTI ID:2418999

Liu, Zhongyun ^[1]; Qiu, Wulin ^[2]; ^[2]

Georgia Institute of Technology, Atlanta, GA (United States); OSTI
Georgia Institute of Technology, Atlanta, GA (United States)

Carbon molecular sieve (CMS) membranes offer the best available combination of scalable economical processability with excellent separation performance. Physical aging of CMS membranes causes pore structure changes over time that affect CMS membrane performance. To provide fundamental insights into the structure evolution in CMS membranes during physical aging, a combined dual-mode sorption and transport model is used in this study to characterize the diffusion coefficients of gas molecules in fresh and 7-day vacuum aged CMS membranes. Further, the results show physical aging of CMS membrane is primarily “diffusion related” and such aging behavior simultaneously causes ultramicropore changes in the continuous phase and Langmuir phase of CMS membrane. The new insights offered in this study suggest strategies to control the physical aging of CMS membranes and even use it as a valuable tool to tune the separation performance of CMS membranes for demanding gas separations.

View Accepted Manuscript (DOE)

Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-04ER15510

OSTI ID:: 2418999

Alternate ID(s):: OSTI ID: 1896342

Journal Information:: Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 45 Vol. 61; ISSN 1433-7851

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Carbon Molecular Sieve Membrane
Dual Mode Model
Gas Separation
Physical Aging
Sorption and Transport

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