Amine-Modified SBA-15: Effect of Pore Structure on the Performance for CO 2 Capture

Several SBA-15 silica materials with different pore structures were synthesized and functionalized with poly(ethyleneimine) (PEI). The as-prepared materials were characterized by XRD, SEM, TG, FT-IR, and N 2 physisorption techniques followed by testing for CO 2 capture using a N 2 stream containing 15.1 v/v% CO 2 in the temperature range of 30−75 °C. The results showed that the CO 2 adsorption capacity linearly increased with the total pore volume of the SBA-15 phases in the tested temperature range ( R 2 > 0.94). Temperature also showed a strong influence on CO 2 adsorption capacity. SBA-15 material with the largest pore volume (1.14 cm 3 g −1 ) exhibited the largest CO 2 adsorption capacity (105.2 mg g −1 adsorbent) with 15.1 v/v% CO 2 in N 2 at 75 °C and atmospheric pressure. Pore size was found not to be the main factor influencing the CO 2 adsorption capacity of these PEI-modified SBA-15 materials. Adsorption−desorption cycles (12) revealed that the adsorbents with PEI loaded inside the pore channels were found to be quite stable, as they retained their CO 2 adsorption capacity with many cycles.