CO₂ sorption kinetics of scaled-up polyethylenimine-functionalized mesoporous silica sorbent

Langmuir : the ACS Journal of Surfaces and Colloids
M J Al-MarriEmmanuel P Giannelis

Abstract

Two CO2 solid sorbents based on polyethylenimine, PEI (M(n) ∼ 423 and 10K), impregnated into mesoporous silica (MPS) foam prepared in kilogram quantities via a scale-up process were synthesized and systematically characterized by a range of analytical and surface techniques. The mesoporous silica sorbent impregnated with lower molecular weight PEI, PEI-423/MPS, showed higher capacity toward CO2 sorption than the sorbent functionalized with the higher molecular weight PEI (PEI-10K/MPS). On the other hand, PEI-10K/MPS exhibited higher thermal stability than PEI-423/MPS. The kinetics of CO2 adsorption on both PEI/MPS fitted well with a double-exponential model. According to this model CO2 adsorption can be divided into two steps: the first is fast and is attributed to CO2 adsorption on the sorbent surface; the second is slower and can be related to the diffusion of CO2 within and between the mesoporous particles. In contrast, the desorption process obeyed first-order kinetics with activation energies of 64.3 and 140.7 kJ mol(-1) for PEI-423/MPS and PEI-10K/MPS, respectively. These studies suggest that the selection of amine is critical as it affects not only sorbent capacity and stability but also the energy penalty associated wit...Continue Reading

References

Feb 20, 2008·Journal of the American Chemical Society·Jason C HicksChristopher W Jones
Jul 22, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Zoltán BacsikNiklas Hedin
Jan 1, 2012·Journal of Environmental Sciences (China)·Jayshri A ThoteSadhana S Rayalu
Jul 16, 2014·ACS Applied Materials & Interfaces·Young Gun KoUng Su Choi
Nov 28, 2014·Journal of Molecular Modeling·Mohammed J Al-MarriMohamed F Shibl

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Citations

Nov 16, 2018·Chemical Science·Supphachok ChanmungkalakulSuda Kiatkamjornwong

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