Synthesis and CO2 sorption of silica particles, kinetics and thermodynamics

Abstract

Spherical ordered mesoporous silica particles with radially oriented mesopores were successfully prepared by using non-ionic amphiphilic di-block co-polymers C_nH_2n+1-(EO)_x-OH as template and tetraorthosilicate (TEOS) as silica precursor. The synthesized mesoporous silica materials were characterized by XRD, N₂ adsorption-desorption and SEM techniques. CO₂ adsorption at 0 °C was evaluated by a volumetric method, and the CO₂ sorption behavior was described by applying both Langmuir and Freundlich equations. Results indicate a high adsorption capacity of CO₂ (5-9 mmol/g), depending essentially on the porous texture of the materials. An adsorption kinetic model was proposed to describe the adsorption of CO₂ over template-free mesoporous siliceous materials. A good agreement with experimental data was found.