205 押出成型による高密度籾殻活性炭の製造(循環型廃棄物処理技術(2))

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An activated carbon with high micro- and mesoporosity, as well as a high bulk density, was fabricated by activating the extrusion-molded precursor made from carbonized rice husk (RH) and beet sugar (BS) at 850℃ in CO_2. The pore structure of this RH-based activated carbon (RHAC) was analyzed in relation to the bulk density. The extrusion molding was very useful to increase the bulk density when compared to the press-molding. RHAC which was first activated for 1 h was immersed again in the BS syrup and then activated in CO_2 for 2 h. This two-step activation process provided both a high bulk density (0.93 g/cm^3) and a highly textured structure (BET specific surface area : 844 m^2/g).
2009-07-08