Correlation Between Pyrolysis Atmosphere and Carbon Molecular Sieve Membrane Performance Properties

Book Chapter

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

KAUST Grant Number


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.

Kiyono M, Koros WJ, Williams PJ (2011) Correlation Between Pyrolysis Atmosphere and Carbon Molecular Sieve Membrane Performance Properties. Membrane Science and Technology: 137–173. Available:

The authors gratefully acknowledge support for this work by Shell Global Solutions (US) Inc., and by award no. KUS-I1-011-21 made by King Abdullah University of Science and Technology (KAUST).

Elsevier BV

Inorganic Polymeric and Composite Membranes - Structure, Function and Other Correlations


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