The ability of natural zeolites (ZAPS, ZNT and ZN-19) to adsorb pure CO2, CH4 and N-2, was studied experimentally. The volume of CO2 adsorption in the monolayer (Langmuir) was found to be close to the micropore volume estimated by the Dubinin-Astakhov model (N-2, 77 K) for all three zeolites. Considerable differences in the adsorption of CO2, CH4, and Na with these zeolites were observed, a factor that can be used for the separation of CO2-CH4 and N-2-CH4 mixtures. The mechanism of activated diffusion was detected in the adsorption of CH4 with ZN-19.