Abstract
The essential mass transfer step in hierarchical/nano zeolite: surface diffusion.
Highlights
The surface diffusion of molecules in zeolites is a kind of transport process on surface instead of the collision with zeolitic surface, which is similar as the configuration diffusion
If the adsorption strength is too strong, it will be difficult for the sorbent molecule to leave the surface
The transport process on the external surface will tend to be followed by re-entering of diffusing molecules into the micropores
Summary
The surface diffusion of molecules in zeolites is a kind of transport process on surface instead of the collision with zeolitic surface, which is similar as the configuration diffusion. The transport process on the external surface will tend to be followed by re-entering of diffusing molecules into the micropores. As mentioned in the reports [6,8], the surface barrier in diffusion obviously increases in hierarchical or nano-zeolites, indicating much stronger interaction between the external surface and the sorbent molecules which will lead to much longer apparent diffusion length [5].
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