Study of CO2 adsorption in functionalized carbon

We evaluated the ability of CO2 adsorption in functionalized activated carbons granular and monolithic type, obtained by chemical activation of African palm stone with H3PO4 and CaCl2. We made a comparison between two methods of incorporation of nitrogen groups: the impregnation method with NH4OH solution and NH3 gasification. The materials were texturally characterized by N-2 adsorption at 77 K, the isotherms shows obtaining microporous materials with surface areas between 545-1425 m(2) g(-1) and pore volumes between 0.22 to 0.53 cm(3) g(-1). It was established that with the methodologies used for functionalization is increased content of nitrogen groups, was achieved a higher proportion of such groups when carrying out the process in liquid phase with NH4OH. The incorporation of nitrogen groups in the material generates an increase of up to 65 % in the CO2 adsorption capacity of the MCa2 (Monolith prepared with CaCl2 solution at 2 %) sample. Was reached a maximum adsorption capacity of 344 mgCO(2) g(-1) in the MCa2FAL (sample MCa2 functionalized with NH4OH solution) sample.