Carbon Dioxide Capture by Amine-Impregnated Mesocellular-Foam-Containing Template
2012
Yan, Wei | Tang, Jing | Bian, Zijun | Hu, Jun | Liu, Honglai
By impregnating polyethylenimine (PEI) into silica mesocellular foam with the template remaining (MCF(a)), a novel sorbent with both high CO₂ adsorption capacity and high thermal stability was obtained. The remaining P123 template in the MCF played a great role in promoting the CO₂ adsorption capacity, which could be 4.5 mmol·g–¹ (adsorbent) when the amount of amine loading and the adsorption temperature were optimized as 60% and at 70 °C for the sample MCF(a)/PEI. Meanwhile, MCF(a)/PEI had a high thermal stability and selectivity, after 10 adsorption–desorption cycles, MCF(a)/PEI almost held a constant adsorption capacity; for different compositions of CO₂ and N₂ mixed gases, it always kept a high adsorption selectivity of CO₂/N₂. The mechanism of the template synergistic effect was elucidated by the result of a second-order rate law through CO₂ adsorption kinetic studies. Moreover, as predicted by the Langmuir adsorption model with n = 2 (two active adsorption sites for one CO₂ molecule), the adsorption enthalpy was calculated as about −85 kJ·mol–¹, a value which belonged to typical chemical adsorption.
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