Adsorption performance of activated carbon for methane with low concentration at atmospheric pressure

Yueqin Song, Xiaolong Zhou, Jin An Wang

    Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

    2 Citas (Scopus)


    This work reports a novel method of combining both chemical activation and N2 or steam post-treatment at high temperature for producing activated carbon (denoted as AC) used for the selective adsorption and separation of methane from the coal-bed gases. The used AC in the investigation mainly contained three kinds, commercial activated carbon (denoted as GH-8), the prepared activated carbon, denoted as AC-P, and AC-K, which was prepared by chemical activation using phosphoric acid and potassium hydroxide solution, respectively. Textural properties, surface oxygen-containing functional groups and methane adsorption performances of AC-P, AC-K, and GH-8 samples were comparatively investigated. Results demonstrated that both AC-P and AC-K showed higher methane adsorption capacity than the commercial activated carbon sample GH-8. Steaming treatment to AC-P at 800°C significantly enhanced the methane adsorption capacity to 6.5 mg/g, which was approximately two times higher than the commercial sample GH-8 (3.2 mg/g). The pronounced increment of adsorption capacity over AC-PS800 from steam-treatment was attributed to the significant increase of the area of micropores with a pore diameter of 0.45–0.65 nm. The presence of surface oxygen-containing groups on AC was proven to be slightly unfavorable to methane adsorption. CH4 concentration in desorbed gas from AC-PS800 was drastically improved to about 70% in the effluent from about 5% in the feed gas, which demonstrated that the prepared AC-PS800 possessed high selective adsorption capacity for methane. These results would pay the way for concentrating and future utilization of methane in coal-bed gas.

    Huella Profundice en los temas de investigación de 'Adsorption performance of activated carbon for methane with low concentration at atmospheric pressure'. En conjunto forman una huella única.

    Citar esto