CO_2 adsorption on granular and monolith carbonaceous materials

摘要

We evaluated the CO_2 adsorption capacity on granular and monolith carbonaceous materials, obtained by chemical activation of African palm stones with H_3PO_4, ZnCl_2 and CaCl_2 solutions at different concentrations. Textural properties of the synthesized materials were analyzed using N_2 adsorption measurements at 77 K, the isotherms showed obtaining of materials microporous and moderately mesoporous, with surface areas between 161 and 1700 m~2/g and pore volume between 0.09 and 0.64 cm~3 g~(-1). Were observed different behaviors for textural parameters in each series, associated with the activating agent used in the preparation. The materials obtained have a CO_2 adsorption capacity between ～114 and 254 mgCO_2/g, at atmospheric pressure and 273 K. It was established that the total amount of CO_2 adsorbed under these experimental conditions is defined by the narrow micropore volume (V_n) and increased the total basicity of the materials.