Diffusion of n-alkanes in zeolites: the benefit of observation over different length scales
Résumé
First results of an international research collaboration to study zeolitic diffusion are presented. By using a variety of experimental techniques, molecular diffusion paths are probed over different time and length scales. As host-guest systems the homologous series of n-alkanes in zeolites NaCaA and silicalite-1 have been selected. Since the diffusivities are found to be the smaller the longer are the diffusion paths covered during the experiments, the observed differences may be explained by the existence of transport resistances acting in addition to the intracrystalline zeolite bulk phase. In selective experiments, indications of such resistances are traced from the range of some 100 nm up to crystal dimensions.
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