Abstract
The isosteric technique with minimal dead volume of sorption cell allows experimental determination of sorption equilibria of multi-component mixtures on microporous sorbents with high accuracy whereby calculation of the changes of thermodynamic functions due to sorption is facilitated. The application is illustrated by measurements of sorption isosteres for ternary mixtures of argon, krypton and xenon, as well as of argon, oxygen and nitrogen on zeolites of types CaA and NaX, respectively. The corresponding sorption enthalpies, entropies and Gibbs' free enthalpies were also determined for each system. These quantities were correlated with the factor of sorptive separation. The success of the isosteric technique for mixtures with more than three components depends mainly on the accuracies with which the sorption phase is prepared and the gaseous phase analysis is performed.
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