Preparation and Characterization of Activated Carbons by Activation with H_3PO_4

摘要

To obtain activated carbons from chestnut tree wood, we followed a two-step process consisting, basically, of a carbonization stage at different temperatures (250℃, 350℃, 450℃, 550℃, 650℃, 750℃ and 850℃) followed by an activation stage with phosphoric acid. Then, we characterized the resulting char and activated carbon through chemical analysis, physical adsorption of gases (N_2 at 77 K), mercury porosimetry, and densities by helium and mercury displacement. The overall conclusion obtained in this work was that carbonization and chemical activation with phosphoric acid produce activated carbons with fairly good textural properties. The effect of chemical activation on char is reflected in the important development of porosity caused by treatment with phosphoric acid.