By studying the literature, adsorbent materials that are suitable for the physical adsorption of anthropogenic CO2 from humid gas streams were identified. Most suitable for this application are amine-functionalized silica-based adsorbents. Some were investigated regarding their behavior in breakthrough experiments with CO2 and water vapor. Results show that the amine-functionalized silica Tri-PE-MCM-41 has got suitable properties for this application. The thermodynamic analysis of pure CO2-adsorption onto Tri-PE-MCM-41 with the ALIc-Modell shows, that the strongest binding forces between the CO2-molecule and the adsorbent wall are present.