Abstract
Steady-state diffusion studies and the NMR pulsed field gradient technique are introduced as equivalent methods for determining long-range diffusivities. Theoretical methods for mass transfer in heterogeneous media are reconsidered and adapted to adsorbate-adsorbent systems. Comparison with the experimental data for n-butane diffusion in NaX zeolites shows that long-range diffusivities are predominantly determined by intercrystalline transport. Estimates of the absolute value of the temperature dependence and of the influence of the pressure of compaction are in agreement with this conclusion.
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