High-temperature CO_2 capture using MgO/γ-Al_2O_3 materials as adsorbent

摘要

CO_2 adsorbent, MgO/γ-Al_2O_3, was prepared by impregnation methods. The structure and surface properties of the prepared materials were characterized by XRD, N_2 adsorption-desorption, in situ FIIR and CO_2-TPD techniques. The results indicated that the surface area, pore size and pore volume of materials decreased with the introduction of MgO. Their capacity for CO_2 adsorption could be significantly improved when the MgO loading increased from 0 to 10 wt%. CO_2-TPD and in-situ FTIR showed that the materials have three basic sites which can react with CO_2 to form bicarbonate, bidentate carbonate and monodentate carbonate species.