CO2 adsorption on granular and monolith carbonaceous materials

We evaluated the CO2 adsorption capacity on granular and monolith carbonaceous materials, obtained by chemical activation of African palm stones with H3PO4, ZnCl2 and CaCl2 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 CO2 adsorption capacity between similar to 114 and 254 mg CO2/g, at atmospheric pressure and 273 K. It was established that the total amount of CO2 adsorbed under these experimental conditions is defined by the narrow micropore volume (V-n) and increased the total basicity of the materials. (C) 2012 Elsevier B.V. All rights reserved.