The book deals with diffusion behavior of hydrocarbons in zeolites. The results obtained from the research will provide a clear understanding of how anomalous diffusion can occur with size of the diffusant. The findings of the work will be useful to people working in petrochemical and other chemical industries. A clear picture of how alkane isomers diffuse in zeolites have been described in detail. Moreover, the work on this book provide some insights in to the entropy-size correlation of diffusing adsorbates in porous solids such as zeolites.