We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
New Insights into Physical Aging‐Induced Structure Evolution in Carbon Molecular Sieve Membranes.
- Authors
Liu, Zhongyun; Qiu, Wulin; Koros, William J.
- Abstract
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. 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.
- Subjects
MOLECULAR sieves; MOLECULAR evolution; GAS separation membranes; POROSITY; DIFFUSION coefficients; SEPARATION of gases
- Publication
Angewandte Chemie, 2022, Vol 134, Issue 45, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202210831