Adsorption of CO2-containing gas mixtures over amine-bearing pore-expanded MCM-41 silica: Application for gas purification

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Research units

  • University of Ottawa


Adsorption of CO2 on triamine-grafted pore-expanded mesoporous silica, TRI-PE-MCM-41, was investigated from very low pressure to 1 bar at four temperatures (298, 308, 318, 328 K) using gravimetric measurements. TRI-PE-MCM-41 exhibited one of the highest equilibrium capacities compared to other typical CO2 adsorbents such as zeolites, activated carbons, and metal-organic frameworks (MOFs). In contrast, under the same pressure and temperature conditions, TRI-PE-MCM-41 exhibited very small uptakes of N 2, CH4, H2, and O2 Column-breakthrough measurements of CO2 in mixtures with other species showed exceedingly high selectivity of CO2 over N 2, CH4, H2, and O2 even at very low CO2 concentrations, indicating that TRI-PE-MCM-41 issuitable adsorbent for gas purification applications. Moreover, water vapor was found to have a beneficial effect on CO2 adsorption capacity even at very low CO2 partial pressure, e.g. 400 ppm, without adverse effect on CO 2 selectivity.


Original languageEnglish
Pages (from-to)359-365
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Issue number1
Publication statusPublished - 6 Jan 2010
MoE publication typeA1 Journal article-refereed

ID: 4457379