Recently, a great interest has been noted in the syntheses of inorganic membranes for gas separation. One of the candidates is a carbon molecular sieve (CMS) membrane, which is synthesized by the pyrolysis of a polymer. However, CMS membranes are very brittle and fragile. Additionally, it requires more careful handling and it is very difficult to prepare a thin CMS membrane because of its poor mechanical property. Therefore, the gas permeances of CMS membranes were not very high.
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