Synthesis and Characterization of Amine-modified Mesoporous SBA-15 for Carbon Dioxide Sequestration at High Pressure and Room Temperature (RESEARCH NOTE)

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