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

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    Date
    2015
    Author
    Al-Marri, M. J.
    Khader, M. M.
    Tawfik, M.
    Qi, G.
    Giannelis, E. P.
    Metadata
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    Abstract
    Two CO2 solid sorbents based on polyethylenimine, PEI (Mn ∼ 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 with sorbent regeneration.
    DOI/handle
    http://dx.doi.org/10.1021/acs.langmuir.5b00189
    http://hdl.handle.net/10576/39365
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    • GPC Research [‎502‎ items ]

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