Effect of pore expansion and amine functionalization of mesoporous silica on CO2 adsorption over a wide range of conditions

Youssef Belmabkhout, Abdelhamid Sayari*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

253 Scopus citations


Adsorption of CO2 was investigated over a wide range of conditions on a series of mesoporous silica adsorbents comprised of conventional MCM-41, pore-expanded MCM-41 silica (PE-MCM-41) and triamine surface-modified PE-MCM-41 (TRI-PE-MCM-41). The isosteric heat of adsorption, calculated from adsorption isotherms at different temperatures (298-328 K), showed a significant increase in CO2-adsorbent interaction after amine functionnalization of PE-MCM-41, consistent with the high CO2 uptake in the very low range of CO2 concentration. The CO2 adsorption isotherm and kinetics data showed the high potential of TRI-PE-MCM-41 material for CO2 removal in gas purification and separation applications. With TRI-PE-MCM-41, the CO2 selectivity over N2 was drastically improved over a wide range of conditions compared to pure mesoporous silica. Moreover, the adsorption was reversible and fast, and the adsorbent was thermally stable and tolerant to moisture.

Original languageEnglish (US)
Pages (from-to)318-328
Number of pages11
Issue number3
StatePublished - Jun 1 2009


  • Amine modified pore-expanded MCM-41
  • CO adsorption
  • CO adsorption selectivity
  • CO removal
  • N adsorption
  • Pore-expanded MCM-41
  • Tolerance to moisture

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Surfaces and Interfaces

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