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Adsorption of CO2-containing gas mixtures over amine-bearing pore-expanded MCM-41 silica / Youssef Belmabkhout in Industrial & engineering chemistry research, Vol. 49 N° 1 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 359–365 Titre : Adsorption of CO2-containing gas mixtures over amine-bearing pore-expanded MCM-41 silica : application for gas purification Type de document : texte imprimé Auteurs : Youssef Belmabkhout, Auteur ; Rodrigo Serna-Guerrero, Auteur ; Abdelhamid Sayari, Auteur Année de publication : 2010 Article en page(s) : pp. 359–365 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Adsorption--CO2-Containing--Gas  Mixtures--Amine-Bearing--Pore-Expanded--MCM-41  Silica:  Application  for  Gas  Purification Résumé : 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 N2, CH4, H2, and O2. Column-breakthrough measurements of CO2 in mixtures with other species showed exceedingly high selectivity of CO2 over N2, CH4, H2, and O2 even at very low CO2 concentrations, indicating that TRI-PE-MCM-41 is suitable 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 CO2 selectivity. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900837t [article] Adsorption of CO2-containing gas mixtures over amine-bearing pore-expanded MCM-41 silica : application for gas purification [texte imprimé] / Youssef Belmabkhout, Auteur ; Rodrigo Serna-Guerrero, Auteur ; Abdelhamid Sayari, Auteur . - 2010 . - pp. 359–365. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 359–365 Mots-clés : Adsorption--CO2-Containing--Gas  Mixtures--Amine-Bearing--Pore-Expanded--MCM-41  Silica:  Application  for  Gas  Purification Résumé : 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 N2, CH4, H2, and O2. Column-breakthrough measurements of CO2 in mixtures with other species showed exceedingly high selectivity of CO2 over N2, CH4, H2, and O2 even at very low CO2 concentrations, indicating that TRI-PE-MCM-41 is suitable 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 CO2 selectivity. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900837t

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

Thermal, oxidative, and CO2 - induced degradation of supported polyethylenimine adsorbents / Aliakbar Heydari-Gorji in Industrial & engineering chemistry research, Vol. 51 N° 19 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6887-6894 Titre : Thermal, oxidative, and CO2 - induced degradation of supported polyethylenimine adsorbents Type de document : texte imprimé Auteurs : Aliakbar Heydari-Gorji, Auteur ; Abdelhamid Sayari, Auteur Année de publication : 2012 Article en page(s) : pp. 6887-6894 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Carbon  dioxide  Oxidation Résumé : This work examines the stability of polyethylenimine(PEI)-impregnated mesoporous silica for CO2 removal over a wide range of conditions. The support used was a SBA-15 silica with platelet morphology and short pore channels (SBA-15PL). The effect of long-term exposure to different gaseous streams, including carbon-free air (CFair), simulated flue gas (SFG), and different CO2/O2/N2 mixtures on the carbon dioxide adsorption capacity was investigated. Extensive CO2 adsorption― desorption cycling using dry and humid streams at different adsorption and regeneration temperatures was also carried out Based on adsorption data, as well as diffuse reflectance infrared Fourier transform (DRIFT) and 13C CP MAS NMR measurements, it was found that PEI-modified adsorbents exhibit (i) high thermal stability at moderate temperatures, (ii) highly stable CO2 uptake in the presence of moisture, (iii) extensive degradation in the presence of dry CO2, particularly at high temperature, (iv) fast degradation upon exposure to CFair even at moderate temperatures, (v) excellent stability in the presence of humidified gases containing both CO2 and O2, ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25900242 [article] Thermal, oxidative, and CO2 - induced degradation of supported polyethylenimine adsorbents [texte imprimé] / Aliakbar Heydari-Gorji, Auteur ; Abdelhamid Sayari, Auteur . - 2012 . - pp. 6887-6894. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6887-6894 Mots-clés : Carbon  dioxide  Oxidation Résumé : This work examines the stability of polyethylenimine(PEI)-impregnated mesoporous silica for CO2 removal over a wide range of conditions. The support used was a SBA-15 silica with platelet morphology and short pore channels (SBA-15PL). The effect of long-term exposure to different gaseous streams, including carbon-free air (CFair), simulated flue gas (SFG), and different CO2/O2/N2 mixtures on the carbon dioxide adsorption capacity was investigated. Extensive CO2 adsorption― desorption cycling using dry and humid streams at different adsorption and regeneration temperatures was also carried out Based on adsorption data, as well as diffuse reflectance infrared Fourier transform (DRIFT) and 13C CP MAS NMR measurements, it was found that PEI-modified adsorbents exhibit (i) high thermal stability at moderate temperatures, (ii) highly stable CO2 uptake in the presence of moisture, (iii) extensive degradation in the presence of dry CO2, particularly at high temperature, (iv) fast degradation upon exposure to CFair even at moderate temperatures, (v) excellent stability in the presence of humidified gases containing both CO2 and O2, ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25900242