Abstract
In this thesis, mesoporous silica of one-dimensional channel structure loaded with amine was used for CO2 adsorption. Cylindric mesoporous silica MCM-41, SBA-15 or pore-expanded SBA-15 silicas were used as supports for grafting 3-aminopropyl-triethoxysilane (mono-amine), N-[3-(trimethoxysilyl) propyl]ethylene diamine (di-amine), or N-[3-(trimethoxysilyl)propyl] diethylene triamine (tri-amine). The pore structure of amine-functionalized silicas was characterized by powder X-ray diffraction and N2 adsorption /desorption at 77 K, and their carbon dioxide adsorption capacity was also examined. Fuethermore, the nitrogen content and thermal stabilities of amine-functionalized SBA-15 were analyzed by elemental and thermal gravimetric methods. The reaction mechanism of CO2 adsorption on amine-grafted SBA-15 have been proposed in the presence and absence of water vapor, and confirmed by Infrared spectroscopy. The captured CO2 could be almost completely removed from amine-SBA-15 at 120 oC detected by TGA-MS.