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2 Theoretical background 20 Fig. 2.2.3-1 Graphical representation of secant and tangent of the adsorption isotherm In the limit of linear isotherm, the thermodynamic correction factor equals unity, so the micropore diffusivity becomes independent of concentration in the adsorbed phase [32]. Mass transfer in micropores is an activated process, which mainly obeys the mechanism of surface diffusion. Molecules situated at active sites along the adsorbent surface must attain enough energy to move from one active site to the next vacant active site [34]. Hence, the diffusion coefficients are strongly dependent on the binding energy of the respective adsorbent- adsorptive combination [51]. Consequently, the temperature dependence of corrected diffusivity D0 is strong and generally follows the Arrhenius form, as presented in Eq. 2.2.3-5. −E D = Aexp a (Eq. 2.2.3-5) 0 RT gsPDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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