Thermodynamics of CO2 adsorption on mesoporous materials impregnated with nickel

Abstract

The adsorption capacity of CO 2 in mesoporous materials with different structures was evaluated. For this purpose, MCM-48 and SBA-15 impregnated with nickel in proportions of 5, 10 and 20 wt% were used. The results showed that impregnation of nickel promoted an increased interaction between CO 2 and the surface of the material. Data were fitted using the Freundlich model. Gibbs free energy and entropy changes of the adsorption system were evaluated. Thermodynamics of adsorption showed that the process is spontaneous. From the Freundlich model, it was concluded that there is a strong interaction of CO 2 with sites of the impregnated materials. Keywords: SBA-15, MCM-48, CO 2 adsorption, Freundlich model. Resumo