Adsorptivities of extremely high surface area activated carbon fibres for CH4 and H2

Abstract

Activated carbon fibres with extremely high surface areas (ACFs) were prepared by CO2 re-activation using pitch-based ACFs having an original surface area of 1730 m2. The highest surface area of the re-activated ACFs was 2930 m2 as determined from an αS-plot analysis of the nitrogen adsorption isotherm measured at 77 K. The ACF with the highest surface area showed excellent adsorptivity towards supercritical CH4 and H2. The amounts of CH 4 and H2 adsorbed were enhanced by 52% and 30%, respectively, as a result of re-activation.