Results are presented on the equilibria and kinetics associated with the adsorption of methane and nitrogen over carbon molecular sieve X2M6/8 Takeda. The adsorption isotherms for this system are described using the LRC (loading ratio correlation) equation. Also, diffusional time constants for N-2 and CH4 are determined over the adsorbent studied and their dependence on temperature and concentration of the adsorbed phase is qualitatively assessed.