Equilibrium and kinetic data for propane and propylene adsorption in pellets (Grace Davison) and crystals (PQ Corp.) of 5A zeolite are presented in the temperature range 323-423 K. The pellet adsorption loading measured by gravimetry is 1.7 mmol/g for propylene and 1.3 mmol/g for propane at 100 kPa and 423 K. The selectivity for propylene increases with temperature and is in the range 1.08-1.35 at 100 kPa, being higher at lower pressures. The kinetic data measured by zero-length-column (ZLC) chromatography indicate that the transport of sorbate in the pellets is controlled by macropore diffusion; pore diffusivities are in the range 0.018-0.027 cm(2)/s for both gases. Crystal diffusivities are in the range (1.1-7.2) x 10(-11) cm(2)/s for propane and (0.2-6.2) x 10(-11) cm(2)/s for propylene.