Equilibrium diffusion and fired-bed adsorption of n-hexane in pellets of 5A zeolite (Rhone-Poulenc) were studied between 373 and 573 K and at partial pressures up to 0.2 bar. Equilibrium data were obtained in a flow microbalance system. Diffusivity was studied simultaneously by gravimetric and ZLC techniques. Adsorption isotherms were satisfactorily described by a localized adsorption model developed by Nitta et al. (1984) with only one temperature-dependent parameter (coefficient of Henry’s law). The isosteric heat of adsorption is 14.2 kcal/mol. Kinetic data clearly show that macropore diffusion is the controlling mass-transfer mechanism. Between 473 and 573 K, pore diffusivities range from 0.11 to 0.13 cm(2)/s in the system He-nC(6), and from 0.06 to 0.08 cm(2)/s in the system N-2-nC(6). The effect of partial pressure of sorbate, temperature, and total flow rate in the behavior of the fired-bed unit is shown. A simple mathematical model with equilibrium and diffusivity parameters obtained in this work predicts with good accuracy all fixed-bed adsorption experiments.