| 초록 |
In this study, methane adsorptions on highly porous anthracite-based activated carbon monoliths were carried out at three different temperatures and at pressures up to 35 bar in a volumetric apparatus. Prior to methane adsorption, activated carbon monoliths have been prepared from synthesized activated carbon powder and different amounts of carboxyl methyl cellulose (CMC) as a binder by compressing them at three different pressures of 25, 45, and 65 MPa. According to the mass basis adsorption results, the adsorption capacities for methane generally increased with their surface area, total pore volume, and micropore volume, respectively. However the maximum volumetric uptake was observed as 164V/V at 293K and 35 bar when KM2-CMC3-65 was used. This result is definitely related to the packing density of carbon monoliths. All the experimental equilibrium data are correlated well with the Langmuir-Freundlich isotherms. Furthermore adsorption energy distributions were calculated based on the Fowler-Guggenheim equation to characterize the porous texture of the samples. |
