open- and closed-loop gravimetry in the pressure and temperature ranges of 0–9 MPa and 273–325 K, respectively. The two odorants were analyzed at the very low concentrations usually found in NG (0–25 mg/(Nm3)). The experimental data were successfully correlated by the adsorption potential theory and collapsed into a single temperature-independent characteristic curve. This analysis allows for extrapolation of the adsorption data to the higher alkanes, for which no experimental data are available, in order to span the global composition of a typical NG stream. The equilibrium data of methane, carbon dioxide and nitrogen were fitted to the Toth and Sips isotherm models and their isosteric heats of adsorption were determined. The preferential adsorption capacity for carbon dioxide indicates that the adsorbent can be used for methane purification from NG, carbon dioxide sequestration from flue gas, or biogas purification.