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Adsorption Characteristics of $CH_4/CO_2$ Mixed Gases on Activated Carbon Fibers  

Moon, Seung-Hyun (Energy and Environment Research Department, Korea Institute of Energy Research)
Shim, Jae-Woon (Energy and Environment Research Department, Korea Institute of Energy Research)
Publication Information
Journal of Korean Society for Atmospheric Environment / v.20, no.5, 2004 , pp. 655-662 More about this Journal
Abstract
An adsorption process to recover the pure $CH_4\;and\;CO_2$ from its mixture was examined. In this study, activated carbon fibers were used as a selective adsorbent. The activated carbon fibers has 78~94% micropore volume and 10.5~20.3${\AA}$ narrow pore size, and showed high adsorption rate and the good selectivity for $CO_2$ under the ambient pressure. The ACF with high surface area showed short mass transfer zone and long breakthrough time and, its adsorption capacity depended on the microporosity. Compared with single component adsorption, the amount adsorbed $CO_2$ on ACF increased by the roll-up of $CH_4$ in mixed gases. The adsorption selectivity increased as now rate and $CO_2$ concentration of mixed gases increased, showing 5.2 selectivity for 75% $CO_2$ concentration.
Keywords
Pressure swing adsorption; Landfill gas; Carbon dioxide; Methane; Activated carbon fiber;
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