Correlation Between Pyrolysis Atmosphere and Carbon Molecular Sieve Membrane Performance Properties

Mayumi Kiyono, William J. Koros, Paul J. Williams

Research output: Chapter in Book/Report/Conference proceedingChapter

9 Scopus citations


Carbon molecular sieve (CMS) membranes have attractive separation performance properties, greatly exceeding an "upper bound" trade-off curve of polymeric membrane performance. CMS membranes are prepared by pyrolyzing polymers, well above their glass transition temperatures. Multiple factors, such as polymer precursor and pyrolysis protocol, are known to affect the separation performance. In this study, a correlation observed between pyrolysis atmosphere and CMS separation performance properties is discussed. Specifically, oxygen exposure during the pyrolysis process is the focus. The theory and details of the oxygen exposure and development of a new CMS preparation method using oxygen as a "dopant" will be described with a strong correlation observed with separation performance for CMS membranes prepared with various polymer precursors. In addition, study of possible mass transfer limitations on the oxygen "doping" process will be described to clarify the basis for the equilibrium-based interpretation of doping data. The method is also explored by changing the pyrolysis temperature. © 2011 Elsevier B.V.
Original languageEnglish (US)
Title of host publicationInorganic Polymeric and Composite Membranes - Structure, Function and Other Correlations
PublisherElsevier BV
Number of pages37
ISBN (Print)9780444537287
StatePublished - 2011
Externally publishedYes


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