Abstract
In order to prove the efficiency of the new frequency response method by actual data, it is applied to propane and ethane over Linde 5A systems, in which considerable discrepancies remain unresolved between the diffusivities determined by the sorption and nuclear magnetic resonance (NMR) methods. The frequency response measurements of the systems reveal that both systems are composed of two types of intracrystalline diffusion processes whose Fickian diffusivities differ from each other four orders of magnitude; the large diffusivity agrees with that obtained from NMR experiments, whereas the small diffusivity corresponds to none of the diffusivities by standard methods. Based on the present results, a model of the zeolitic diffusion which contains two kinds of admolecules, tightly and loosely bound within the cages, is proposed. The frequency response method would be effective therefore to clarify the whole aspect of the kinetic phenomena which seems available to characterize zeolite catalysts.
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