Link to citation list in Scopus. The adsorption kinetics and equilibria of N 2 and CH 4 in pelletized zeolite 4A, 5A and CaX were studied theoretically and experimentally at the range of K and 0. Using the isothermal and nonisothermal adsorption rate models, the diffusion mechanism was investigated from the experimental uptake curves through a gravimetric method. While the diffusion rates of N 2 and CH 4 were controlled by micropore diffusion in zeolite 4A, they were significantly affected by macropore diffusion in zeolite 5A. In the case of the systems controlled by micropore diffusion, the micropore diffusivity showed a moderately increasing trend with fractional coverage according to the Darken equation. Department of Chemical and Biomolecular Engineering. In the systems controlled by macropore diffusion, the effective macropore diffusivity increased with pressure due to its favorable isotherm, and the macropore diffusivity kept a constant value in the domain of Knudsen diffusion.
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