Abstract
The results of a molecular probe study on two Saran carbons prepared up to 1000°C and on polyvinylidene chloride carbons prepared up to 1500°C are reported. The Saran carbons adsorb appreciably more isobutane than neopentane over the whole carbonization range, indicating 6Å molecular sieve properties. Benzene and cyclohexane are also adsorbed to an appreciably greater extent than neopentane. Polyvinylidene chloride carbons prepared at comparable temperatures adsorb neopentane freely; neopentane molecular sieve effects are only observed for samples heated above 1200°C. It is concluded that the observed molecular sieve effects are due to slit-shaped pore constrictions having a size between ca. 4·5 and 5·7Å in thickness and connecting cavities of at least ca. 12Å in thickness.
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