Adsorption Behavior of Carbon Dioxide on New Nanocomposite CuO/PPB: Effect of CuO Content

Porous carbon supported calcium oxide for CO2 adsorption and separation of CO2/CH4

Calcium oxide incorporated porous carbon materials were synthesized by the impregnation method to study CO₂ adsorption and separation of CO₂/CH₄. The X-ray diffraction, Raman analysis, N₂ isotherms at 77 K, and SEM with EDX analysis were used to characterize synthesized materials. XRD and N₂ isotherm results have confirmed that synthesized carbon has porosity, and EDX analysis has reported that the presence of CaO on porous carbon. 10CaO/porous carbon has shown 31 cm³ g^-1 of CO₂ adsorption which was higher than bare porous carbon CO₂ adsorption 17.5 cm³ g^-1 at 298 K, 1 bar. It was attributed to electrostatic interaction between CaO and CO₂. However, CH₄ adsorption was decreased by a decrease in surface area. The selectivity of CO₂/CH₄ was higher for 10CaO/porous carbon and the heat of CO₂ adsorption was 36 KJ/mol at high adsorption of CO₂. Moreover, CO₂ adsorption was the same in each adsorption cycle.