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Diffusion of n-Alkanes in MFI-Type Zeolites : a Comparative Study with Different Measuring Techniques

1. Introduction An international research collaboration has been initiated in order to study in detail diffusion of molecules in zeolitic crystals using a variety of experimental techniques which can be used to probe these systems over different time scales and length scales. The aim is to provide sufficient experimental information that can lead to a better understanding of the main mechanisms that influence mass transfer in nanoporous materials. To guarantee the validity of the results, the studies are all performed on crystals purposely synthesized. In this contribution we report our results on MFI type zeolites for the homologous series of n-alkanes. The experimental results clearly show an increase in diffusional time constants with the increase of length scale of the observation, which is an indication that in these zeolites the effect of internal inhomogeneities in the crystalline structure has a significant impact on mass transfer.