Permeation Flow in Zeolite Membranes

Transport and adsorption processes in microporous materials have been, during the last years, a topic of significant research activity [19,92-94,98], Section 5.9.2 dealt with the phenomenological description of diffusion in zeolites. Applying this methodology to a membrane, it is possible to express the flux of a gas through the zeolite membrane in isothermal conditions as follows [19,70,92-94] 

is the intrinsic or corrected diffusion coefficient is the thermodynamic factor 

Under steady-state conditions, Equation 10.33 can be integrated to give the steady-state flux [92] 

As described in Section 5.9.1, we can calculate the self-diffusion coefficients for localized and mobile adsorption sites with the help of Equations 5.104 and 5.105 [82], Now, it is possible to consider that [70] 

The Physical Chemistry of Materials Energy and Environmental Applications 

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