Study on Intracrystalline Diffusion in Zeolite with Random Walk Method

The effects of random blocking of intracrystalline pores and intracrystalline secondary pores in zeolite on dimensionless effective diffusivity are investigated with the method of a random walk process in a finite, two-dimensional network of pores. The diffusivity decreases rapidly when the percentage of pore blocked increases, because the continuity of the network is damaged in case of bulk pore blocking and the degree of connection between the network and surroundings drops in case of border sites blocking. The secondary pore can improve the intracrystalline diffusion. The behavior of effective intracrystalline diffusivity vs percentage of secondary pores is of linear relation.