Column dynamic study of mass transfer of pure N2 and O2 into small particles of pelletized LiLSX zeolite

Effective mass transfer coefficients (κ^e,s^-1) for adsorption of pure N₂ and O₂ into small particles of a pelletized sample of lithium exchanged low silica X (LiLSX) zeolite were estimated as functions of gas pressure (P) and temperature (T) by analysis of experimental column dynamic data using a specific protocol based on assumptions of a constant pattern mass transfer zone (MTZ) formation and a linear driving force model for mass transport. New column breakthrough data at different P and T for displacements of pure inert helium by pure N₂ or O₂ in an isobaric-isothermal adsorber were used. The mass transfer coefficients decreased linearly with increasing P and increased with increasing T. Data interpretation using a "resistances in series" model for isothermal-isobaric mass transport of an adsorbate having a linear adsorption isotherm into a pelletized zeolite particle suggested the presence of a skin resistance at the pellet surface, which in combination with resistances created by axial dispersion in the adsorber gas phase and external film contributed to most of the overall mass transfer resistance under the test conditions. The P and T dependence of k^e were consistent with that observation.