The sorption equilibrium of CO 2 and CH 4 in binderless beads of 13X zeolite has been investigated between 313 and 373K and pressure up to 4atm. The amount adsorbed of CO 2 and CH 4 is around 5.2mmol/g ads and 1.2mmol/g ads , respectively, at 313K and 4atm. Comparing these values with the ones in literature the value of CO 2 is 20% higher than in CECA 13X binder pellets. It is also found that isotherms are pronounced Type I for CO 2 and almost linear for CH 4 . The CO 2 isotherms were modeled using a simple deviation from Langmuir isotherm that takes into account interaction between adsorbed molecules at adjacent sites (Fowler model) suggesting a moderate repulsion. Henry’s constants range from 143 to 11.1mmol/g ads .atm for CO 2 and 0.45 to 0.27mmol/g ads .atm for CH 4 between 313 and 373K, respectively. The heats of sorption at zero coverage are 43.1kJ/mol for CO 2 and 9.2kJ/mol for CH 4 .The sorption kinetics has been investigated by the Zero-Length Column technique (ZLC). Recipes to analyze ZLC desorption curves in pellets of adsorbents are reviewed and it is derived a criteria which indicates that for the sorption rate be measured macroscopically the time of the experiment (that should be above a few seconds) is directly calculated with the following expression: t0.1≥7.02×10-2rc2Dc. Based on such criteria it is shown that crystal diffusivity of CO 2 in 13X can be measured macroscopically by ZLC, being the same measurement for CH 4 practically impossible. The crystal diffusivity of CO 2 measured experimentally is 5.8×10 −15 m 2 /s and 1.3×10 −15 m 2 /s at 373 and 313K, respectively. These values are comparable to the ones measured by a frequency response and pulse chromatography techniques reported in literature. The ZLC desorption curves for CH 4 were measured under an equilibrium regime.