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Effect of electrolytes on CO-water mass transfer / Haiyang Zhu in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 3206–3210 Titre : Effect of electrolytes on CO-water mass transfer Type de document : texte imprimé Auteurs : Haiyang Zhu, Auteur ; Brent H. Shanks, Auteur ; Heindel, Theodore J., Auteur Année de publication : 2009 Article en page(s) : pp. 3206–3210 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Electrolytes  CO-water  mass  transfer  Mass-transfer  coefficient  MCM41  nanoparticles Résumé : The influence of various electrolytes such as sulfate, nitrate, and chloride on CO−water mass transfer was investigated in this study. The results indicate that the enhancement in the CO−water volumetric mass-transfer coefficient ranged from 1.5 to 4.7 times that of a baseline system without electrolytes, depending on electrolyte type and concentration. For those electrolytes with the same anions, copper-containing electrolytes provided stronger enhancement, whereas for those electrolytes with the same cations, sulfate-containing electrolytes showed stronger enhancement. By measuring both the CO−water volumetric mass-transfer coefficient (kLa) and the mass-transfer coefficient (kL), it was found that the electrolytes inhibit gas bubble coalescence. This leads to an increase in the gas−liquid interfacial area, resulting in CO−water mass-transfer enhancement. In contrast, when MCM41 nanoparticles with or without functionalized mercaptopropyl groups were added to water, the mass-transfer coefficient and CO−water interfacial area were both increased. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8012924 [article] Effect of electrolytes on CO-water mass transfer [texte imprimé] / Haiyang Zhu, Auteur ; Brent H. Shanks, Auteur ; Heindel, Theodore J., Auteur . - 2009 . - pp. 3206–3210. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 3206–3210 Mots-clés : Electrolytes  CO-water  mass  transfer  Mass-transfer  coefficient  MCM41  nanoparticles Résumé : The influence of various electrolytes such as sulfate, nitrate, and chloride on CO−water mass transfer was investigated in this study. The results indicate that the enhancement in the CO−water volumetric mass-transfer coefficient ranged from 1.5 to 4.7 times that of a baseline system without electrolytes, depending on electrolyte type and concentration. For those electrolytes with the same anions, copper-containing electrolytes provided stronger enhancement, whereas for those electrolytes with the same cations, sulfate-containing electrolytes showed stronger enhancement. By measuring both the CO−water volumetric mass-transfer coefficient (kLa) and the mass-transfer coefficient (kL), it was found that the electrolytes inhibit gas bubble coalescence. This leads to an increase in the gas−liquid interfacial area, resulting in CO−water mass-transfer enhancement. In contrast, when MCM41 nanoparticles with or without functionalized mercaptopropyl groups were added to water, the mass-transfer coefficient and CO−water interfacial area were both increased. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8012924

Enhancing CO-water mass transfer by functionalized MCM41 nanoparticles / Haiyang Zhu in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7881-7887 Titre : Enhancing CO-water mass transfer by functionalized MCM41 nanoparticles Type de document : texte imprimé Auteurs : Haiyang Zhu, Auteur ; Brent H. Shanks, Auteur ; Heindel, Theodore J., Auteur Année de publication : 2008 Article en page(s) : P. 7881-7887 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : CO-Water  Gas Résumé : Organic groups are grafted to ∼250-nm-diameter MCM41 nanoparticles with a spherical morphology to enhance the CO−water volumetric mass-transfer coefficient (kLa) for synthesis gas fermentation. The results indicate that (i) ∼250-nm MCM41 nanoparticles show a higher kLa value than large silica particles (1.4 and 7 μm), (ii) surface hydroxyl groups on MCM41 nanoparticles play an important role in mass-transfer enhancement, (iii) organic groups grafted to MCM41 modify the mass-transfer enhancement, and (iv) mercaptan groups grafted to MCM41 show the most mass-transfer enhancement of ∼1.9 times that of no nanoparticle addition. The CO−water mass-transfer enhancement depends on the interaction between the nanoparticles and the CO molecules, which is influenced by the hydrophobicity of the nanoparticles and the functional group on the nanoparticles. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800238w [article] Enhancing CO-water mass transfer by functionalized MCM41 nanoparticles [texte imprimé] / Haiyang Zhu, Auteur ; Brent H. Shanks, Auteur ; Heindel, Theodore J., Auteur . - 2008 . - P. 7881-7887. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7881-7887 Mots-clés : CO-Water  Gas Résumé : Organic groups are grafted to ∼250-nm-diameter MCM41 nanoparticles with a spherical morphology to enhance the CO−water volumetric mass-transfer coefficient (kLa) for synthesis gas fermentation. The results indicate that (i) ∼250-nm MCM41 nanoparticles show a higher kLa value than large silica particles (1.4 and 7 μm), (ii) surface hydroxyl groups on MCM41 nanoparticles play an important role in mass-transfer enhancement, (iii) organic groups grafted to MCM41 modify the mass-transfer enhancement, and (iv) mercaptan groups grafted to MCM41 show the most mass-transfer enhancement of ∼1.9 times that of no nanoparticle addition. The CO−water mass-transfer enhancement depends on the interaction between the nanoparticles and the CO molecules, which is influenced by the hydrophobicity of the nanoparticles and the functional group on the nanoparticles. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800238w