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pores, collisions between the diffusing molecule and pore wall become important resulting in Knudsen diffusion. Furthermore, Poiseuille flow (pressure driven flow inside a particle) becomes relevant with larger pore and particle sizes and at higher pressures, such as the pressurization step of a PSA process. Under high adsorbate concentrations and if the adsorbed phase is mobile, adsorbed molecules may diffuse on the pore surface as well.8 Micropore diffusion occurs in pores of comparable size to the adsorbate molecules. For a zeolite particle, this occurs within the crystals where pore size into the cavity of the zeolite is limited by the oxygen windows. If a binder is present, micropore diffusion will occur through the binder as well. The “adsorbed phase” in this type of diffusion refers to the combination of molecules adsorbed on the pore wall and trapped in the middle of the pore.8 Micropore diffusion is an activated process because unlike macropore diffusion, it is not possible for the adsorbate molecules to escape the forces of the pore wall; hence temperature strongly influences micropore diffusion. The type and distribution of the exchangeable cation will affect adsorbate diffusivity into the micropores, along with how strongly the adsorbate molecules are attracted on to the surface. 17PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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