Abstract
Gas-solid chromatography was used to determine the second gas-solid virial coefficients in the temperature range 343–597 K for ethane, propane, n-butane, 2-methylpropane, n-pentane, 2-methylbutane, 2,2-dimethylpropane, n-hexane, 2,2-dimethylbutane, and cyclohexane with 13X zeolite. The temperature dependence of the second gas-solid virial coefficients of these 10 hydrocarbons along with the available methane data was used in conjunction with a Lennard-Jones and Devonshire cell model to determine the 13X zeolite structural parameters of cavity radius and number of cavities per gram of adsorbent, as well as gas-cavity interaction energies. The 13X structural parameters were compared to X-ray crystallographic values. The interaction energies were found to be linearly dependent on the number of carbon atoms in the adsorbate hydrocarbon with the more highly branched molecules having somewhat lower energies. The interaction energies were correlated with hydrocarbon boiling points and energetic additivity rules on the basis of molecular structure.
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