CO2 adsorption by ethane periodic mesoporous organosilica at low temperatures and high pressure
David Cantador-Fernández, David Suescum-Morales, Dolores Esquivel, José Ramón Jiménez, J.M. Fernández
Abstract
In this work, the maximum CO2 adsorption capacity of an ordered mesoporous organosilica with ethylene bridges (PMO-Ethane) was studied. The maximum capture capacity was achieved for the sample at 0 °C and 34 atm (827.8 mg·g-1). This result was better than that obtained by most of the studies on other mesoporous materials found in the literature. Approximately 0.33 g of PMO-Ethane would be sufficient to shrink the concentration of atmospheric CO2 by 1 m3 to preindustrial levels. A study of successive adsorption-desorption cycles has demonstrated the material's potential for use in reversible multicycle CO2 capture processes. The CO2 adsorption curves were fitted using mathematical models: Langmuir, Freundlich, Sips, Toth, DubininRadushkevich and Temkin. Previously, several techniques were used to characterize the material: X-Ray diffraction (XRD), surface area (SBET) and porosity, thermogravimetric and differential thermal analysis (TGA-DTA), particle size, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). These results contribute to the development and use of new materials in GHG capture technologies.