Single gas permeation of thin zeolite (MFI) membranes: theory and analysis of experimental observations

Theoretical expressions for single gas permeation are analysed and evaluated with selected literature and some new experimental data on Silicalite/ZSM-5 membranes. The phenomenological sorption–diffusion (PSD) description (and its equivalent Maxwell–Stefan equation) covers both the microscopic models based on configurational diffusion (CD) with δ=1.0 and on surface diffusion (SD) with δ≥1.24. The ratio δ of the pore diameter over the (kinetic) molecular diameter is important. For 1.24≤δ Ar>Kr>Xe at given values of δ close to unity is predicted by the SEMP model.

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