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Development and characterization of amine-functionalized hyper-cross-linked resin for CO2 capture

Fenglei Liu,Shuoyu Wang,Guorong Lin,Shuixia Chen

A hyper-cross-linked resin (PDVBpc) based solid amine adsorbent was synthesized by suspension polymerization of divinylbenzene (DVB) and a Friedel–Crafts alkylation reaction, followed by impregnation with tetraethylenepentamine (TEPA), for CO2 capture. The results showed that the specific surface area and pore volume of the initial porous polymer (PDVB) remarkably increased after the Friedel–Crafts alkylation reaction, which was beneficial for increasing the loading of TEPA and the adsorption of CO2. To determine the CO2 adsorption performance, certain factors, including the TEPA loading, flow rate, CO2 concentration and adsorption temperature, were investigated. The maximum adsorbed amount of CO2 (3.11 mmol g−1) was achieved at 25 °C and a CO2 concentration of 10 vol% when the flow rate was 30 mL min−1 and the TEPA loading was 30 wt%. The optimal TEPA loading could provide sufficient active sites for CO2 capture, whereas excessive loading may lead to aggregation of the adsorbent and blockage of pore channels. An increase in temperature was unfavourable for the adsorption of CO2, because the reaction between amine groups and carbon dioxide was exothermic. A high CO2 concentration would reduce the breakthrough time but would not affect the adsorption capacity for CO2. The experimental data fitted the Avrami model well at different temperatures, which indicated that both physisorption and chemisorption contributed to the adsorption of CO2. Thus, a promising material for the adsorption of CO2 was obtained via the functionalization with TEPA of a hyper-crosslinked resin.