Synthesis and Characterization of Amine-modified Mesoporous SBA-15 for Carbon Dioxide Sequestration at high Pressure and Room Temperature

Amine-modified mesoporous SBA-15 adsorbent has been prepared by impregnation method usingtetraethylenepentamine. The samples of this modified SBA-15 have been characterized by small angleX-ray scattering (SAXS), Scanning electron microscopy (SEM), Nitrogen adsorption-desorptionisotherm and FT-IR. The adsorption capacity of CO2 on unmodified and modified samples weremeasured at high pressure (up to 20 bar) and room temperature and were 2.69, 4.02 and 3.62 mmolCO2/g for SBA-15, TEPA (55%)-SBA-15 and TEPA (65%)-SBA-15, respectively. The increment inthe CO2 adsorption capacity of amine modified mesoporous material (TEPA (55%)-SBA-15) isattributed to the increased amine mass interaction with CO2. Further increase of amine content clogsthe pores of the sorbent which results in slight reduction of CO2 adsorption in TEPA (65%)-SBA-15).