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Methane adsorption capacity was determined for activated carbon as an adsorbent material made from macadamia nut shells. The limiting amount adsorbed is 13 mmol g–1 (22 wt %) at a pressure of 40 MPa and 303 K. The influence of hydrogen sulfide on methane adsorption capacity has been established. At a concentration of 1%, after 5 charging–discharging cycles, the ability to adsorb methane gas is little affected. However, this parameter was reduced by up to 15.4% after performing 10 charging and discharging cycles; reduced by 38.5% after 20 cycles and 61.5% after 30 cycles. [ABSTRACT FROM AUTHOR]