Abstract
Mesoporous cubic MCM-48 material was synthesized and functionalized with 3-aminopropyltriethoxy-silane (APTES) under different conditions and used for CO 2 adsorption. Before and after functionalization the materials were characterized by different techniques: XRD, TEM, TGA, fluorescence analysis of amino and adsorption–desorption isotherms of N 2 and CO 2. The results confirmed that CO 2 adsorption in amino modified materials involves both chemisorption and physisorption. The former is the primary mechanism at low partial pressures, and includes the formation of carbamates. This material demonstrated a high efficiency for CO 2 removal at low CO 2 partial pressures, with loadings of 0.5 mmolCO 2/molN at 5 kPa. The maximum adsorption capacity at 1 atm of CO 2 was 1.68 mmol/g.
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