The intrapartical diffusivity plays an important role in guiding the process of shape-selective catalysis and adsorptive separation. The methods of study on intracrystalline diffusion in zeolites

such as gravimetric method

NMR technique and molecular simulation

were summarized firstly. Furthermore

recent progress in development and application of Zero Length Column (ZLC) method to the measurement of intracrystalline diffusion in zeolites was reviewed

including single component in gas-phased diffusion with two sampling patterns (gas phase and liquid phase sampling)

gas-phased diffusion of binary system and counter diffusion

liquid-phased diffusion

and development of the mathematical models. Some existing problems were also discussed. Finally

application of ZLC method for diffusion of hydrocarbon molecules in the porous materials in the future was prospected.