Adsorption of Co2 from flue gas streams by a highly efficient and stable aminosilica adsorbent

Shou Heng Liu, Yuan Chung Lin, Yi Chi Chien, Han Ren Hyu

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40 Citations (Scopus)


Three ordered mesoporous silicas (OMSs) with different pore sizes and pore architectures were prepared and modified with amine functional groups by a postgrafting method. The carbon dioxide (CO2) adsorption on these amine-modified OMSs was measured by using microbalances at 348 K, and their adsorption capacities were found to be 0.2–1.4 mmol g−1 under ambient pressure using dry 15% CO2. It was found experimentally that the CO2 adsorption capacity and adsorption rate were attributed to the density of amine groups and pore volume, respectively. A simple method is described for the production of densely anchored amine groups on a solid adsorbent invoking direct incorporation of tetraethylenepentamine onto the as-synthesized OMSs. Unlike conventional amine-modified OMSs, which typically show CO2 adsorption capacity less than 2 mmol g−1, such organic template occluded amine-OMS composites possessed remarkably high CO2 uptake of approximately 4.6 mmol g−1 at 348 K and 1 atm for a dry 15% CO2/nitrogen feed mixture. The enhancement of 8% in CO2 adsorption capacity was also observed in the presence of 10.6% water vapor. Durability tests done by cyclic adsorption-desorption revealed that these adsorbents also possess excellent stability.

Original languageEnglish
Pages (from-to)226-233
Number of pages8
JournalJournal of the Air and Waste Management Association
Issue number2
Publication statusPublished - 2011 Feb

All Science Journal Classification (ASJC) codes

  • Management, Monitoring, Policy and Law
  • Waste Management and Disposal
  • General Medicine
  • Pollution
  • Atmospheric Science


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