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

Jaber Al Marri, M. M. Khader, M. Tawfik, G. Qi, E. P. Giannelis

Research output: Contribution to journalArticle

20 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3569-3576
Number of pages8
JournalLangmuir
Volume31
Issue number12
DOIs
Publication statusPublished - 31 Mar 2015
Externally publishedYes

Fingerprint

Polyethyleneimine
Polyetherimides
sorbents
Sorbents
Silicon Dioxide
sorption
Sorption
Silica
silicon dioxide
Kinetics
kinetics
Adsorption
adsorption
Molecular Weight
Molecular weight
low molecular weights
penalties
regeneration
foams
Amines

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

CO2 sorption kinetics of scaled-up polyethylenimine-functionalized mesoporous silica sorbent. / Al Marri, Jaber; Khader, M. M.; Tawfik, M.; Qi, G.; Giannelis, E. P.

In: Langmuir, Vol. 31, No. 12, 31.03.2015, p. 3569-3576.

Research output: Contribution to journalArticle

Al Marri, Jaber ; Khader, M. M. ; Tawfik, M. ; Qi, G. ; Giannelis, E. P. / CO2 sorption kinetics of scaled-up polyethylenimine-functionalized mesoporous silica sorbent. In: Langmuir. 2015 ; Vol. 31, No. 12. pp. 3569-3576.
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