Abstract
Binary and multicomponent diffusion in zeolites is of considerable practical relevance. However, the nature of flux equations applicable to such systems and the relationship between the binary diffusion coefficients and intrinsic diffusion coefficients is not well understood. Investigation of this relationship by the common techniques for sorption studies poses experimental difficulties. The authors have recently analysed sorption of a single sorbate by random walk approach. In the present work this approach is extended to study simultaneous sorption of two sorbates. The analysis reveals that the contribution of the cross terms is significant. The sorption of the species with higher diffusivity is slowed down due to the presence of a sorbate with lower diffusivity. On the other hand the rate of sorption of the slower sorbate can be faster than its intrinsic rate due to the contribution of the cross term.
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