Adsorption of Methane onto Microporous Activated Carbon in a Volumetric Storage System.

ES-103(1) microporous carbon adsorbent with specific micropore volume W₀ = 0.80 cm³/g and pore width Х₀ = 1.32 nm was prepared by thermochemical activation of wood waste in Н₃РО₄ at 1173 K. The specific BET surface of the adsorbent was S_BET = 2115 m²/g. At 303 K and 20 MPa, the methane-adsorption capacity of the adsorbent reached ~22 wt %. In the main region of micropore fillings, the differential molar isosteric heats of methane adsorption gradually dropped from ~16 to 12 kJ/mol. To increase the energy of methane adsorption, it is necessary to use systems that provide a possibility additionally to increase the energy of adsorption due to the energy of adsorbate associating in micropores. At a pressure of 10 MPa, the methane volumetric density in ES-103(1) adsorbent compacted with a binder achieved 200 m³(NTP)/m³. [ABSTRACT FROM AUTHOR]