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New insights into the interactions of CO2 with amine-functionalized silica / Rodrigo Serna-Guerrero in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9406–9412 Titre : New insights into the interactions of CO2 with amine-functionalized silica Type de document : texte imprimé Auteurs : Rodrigo Serna-Guerrero, Auteur ; Enshirah Da’na, Auteur ; Abdelhamid Sayari, Auteur Année de publication : 2009 Article en page(s) : p. 9406–9412 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Interactions  of  CO2  Amine-functionalized  silica Résumé : The CO2−amine chemistry in gas−solid processes was investigated under both humid and dry conditions using aminopropyl-grafted pore-expanded MCM-41 silica (MONO-PE-MCM-41). To draw accurate conclusions, a set of conditions had to be met including (i) the use of an adsorbent with open pore structure and readily accessible adsorption sites, e.g. MONO-PE-MCM-41 with a mean pore size of 7.2 nm; (ii) the CO2 concentration in the feed should be high enough to achieve saturation via chemisorption, but low enough to avoid any additional physisorption, e.g., 5% CO2 in N2; (iii) the use of a reliable method for the accurate measurement of CO2/N ratio. Under such conditions, the obtained CO2/N ratios were reminiscent of those obtained in the CO2 scrubbing process using ethanolamine solutions. Under dry conditions, the CO2/N ratio was close to 0.5, consistent with the formation of carbamate. Streams with relative humidity (RH) of 27, 61, and 74% were studied as well. As RH in the feed increased, CO2/N ratio increased from 0.57 to 0.88, in line with the gradual formation of bicarbonate. As for the determination of CO2/N ratio under dry conditions, both thermogravimetry (TG) and mass spectrometry (MS) were suitable, whereas in the presence of moisture, TG was found to drastically underestimate the CO2 uptake. The seemingly disparate CO2/N ratios reported in the literature for various propylamine-bearing adsorbents were rationalized on the basis of the adsorbent pore structure and/or the experimental conditions used. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801186g [article] New insights into the interactions of CO2 with amine-functionalized silica [texte imprimé] / Rodrigo Serna-Guerrero, Auteur ; Enshirah Da’na, Auteur ; Abdelhamid Sayari, Auteur . - 2009 . - p. 9406–9412. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9406–9412 Mots-clés : Interactions  of  CO2  Amine-functionalized  silica Résumé : The CO2−amine chemistry in gas−solid processes was investigated under both humid and dry conditions using aminopropyl-grafted pore-expanded MCM-41 silica (MONO-PE-MCM-41). To draw accurate conclusions, a set of conditions had to be met including (i) the use of an adsorbent with open pore structure and readily accessible adsorption sites, e.g. MONO-PE-MCM-41 with a mean pore size of 7.2 nm; (ii) the CO2 concentration in the feed should be high enough to achieve saturation via chemisorption, but low enough to avoid any additional physisorption, e.g., 5% CO2 in N2; (iii) the use of a reliable method for the accurate measurement of CO2/N ratio. Under such conditions, the obtained CO2/N ratios were reminiscent of those obtained in the CO2 scrubbing process using ethanolamine solutions. Under dry conditions, the CO2/N ratio was close to 0.5, consistent with the formation of carbamate. Streams with relative humidity (RH) of 27, 61, and 74% were studied as well. As RH in the feed increased, CO2/N ratio increased from 0.57 to 0.88, in line with the gradual formation of bicarbonate. As for the determination of CO2/N ratio under dry conditions, both thermogravimetry (TG) and mass spectrometry (MS) were suitable, whereas in the presence of moisture, TG was found to drastically underestimate the CO2 uptake. The seemingly disparate CO2/N ratios reported in the literature for various propylamine-bearing adsorbents were rationalized on the basis of the adsorbent pore structure and/or the experimental conditions used. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801186g