CO2 Adsorption on Activated Carbon/SBA-15 with TETA/TEPA Modification

Activated carbon (AC), the KOH-modified activated carbon (KAC) and mesoporous material SBA-15 before and after pore expansion (SBA-15k) were modified using triethylenetetramine (TETA) and tetraethylenepentamine (TEPA) as modifiers. The CO₂ adsorption capacities of adsorbents were determined by thermogravimetric method. The results show that at 60 °C and the atmosphere of 15% CO₂ (volume fraction), with the increasing of amine loading amount, the CO₂ adsorption capacities of AC and KAC decreased gradually. While those of SBA-15 and SBA-15k increase at first stage and decrease subsequently. Cyclic CO₂ adsorption capacities and mass of the adsorbents show no obvious changes, so the adsorbents have excellent stability.