Methane Adsorption onto Microporous Carbon Adsorbent Prepared from Nut Shell Raw Materials

A highly active microporous carbon adsorbent, KAUSORB-VA, with a micropore volume of 0.68 cm3/g and a specific BET surface of 1640 m2/g, was synthesized from nut shells for systems of adsorption storage of natural gas. Methane adsorption onto the adsorbent was measured at pressures up to 40 MPa and at temperatures of 303, 313, 323, and 333 K. The methane adsorption was found to achieve a maximum value of ~13.5 mmol/g (21.5 wt %) at a temperature of 303 K. The average differential molar isosteric heat of methane adsorption at 303 K was found to be ~16 kJ/mol.