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Comparison study on the adsorption of CFC - 115 and HFC - 125 on activated carbon and silicalite - 1 / Yong Peng in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10009–10015 Titre : Comparison study on the adsorption of CFC - 115 and HFC - 125 on activated carbon and silicalite - 1 Type de document : texte imprimé Auteurs : Yong Peng, Auteur ; Fumin Zhang, Auteur ; Xiao Zheng, Auteur Année de publication : 2011 Article en page(s) : pp. 10009–10015 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Adsorption  Activated  carbon  Silicalite Résumé : The adsorption isotherms of CFC-115 (1-chloro-1,1,2,2,2-pentafluoroethane) and HFC-125 (1,1,1,2,2-pentafluoroethane) on Vruf activated carbon (Calgon Carbon Corp.; brand code, VRU-F) and silicalite-1 have been accurately measured at pressures up to 120 kPa and temperatures ranging from 273 to 348 K. The Tóth or dual-site Langmuir (DSL) model appropriately describes the equilibrium data for the adsorptives CFC-115 and HFC-125 on Vruf carbon or silicalite-1, respectively. Because HFC-125 molecule has a higher packing efficiency in the pores of Vruf carbon, its saturation capacity extracted by the Tóth model is higher than that for CFC-115. For CFC-115, a “kink” in the isotherm on silicalite-1 is observed at about 4 molecules (unit cell of silicalite-1)−1, and the measured isotherms of CFC-115 for the first time show a second-step adsorption at loadings over 4 molecules (unit cell)−1. This is ascribed to a large difference in the adsorption entropy between the molecular locations in the intersections and in the channels. The DSL model with fixed saturation capacities describes this behavior well. The mixture adsorption isotherms predicted by the ideal adsorbed solution theory show that both adsorbents could be industrially applicable in the separation of CFC-115 and HFC-125. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1010806 [article] Comparison study on the adsorption of CFC - 115 and HFC - 125 on activated carbon and silicalite - 1 [texte imprimé] / Yong Peng, Auteur ; Fumin Zhang, Auteur ; Xiao Zheng, Auteur . - 2011 . - pp. 10009–10015. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10009–10015 Mots-clés : Adsorption  Activated  carbon  Silicalite Résumé : The adsorption isotherms of CFC-115 (1-chloro-1,1,2,2,2-pentafluoroethane) and HFC-125 (1,1,1,2,2-pentafluoroethane) on Vruf activated carbon (Calgon Carbon Corp.; brand code, VRU-F) and silicalite-1 have been accurately measured at pressures up to 120 kPa and temperatures ranging from 273 to 348 K. The Tóth or dual-site Langmuir (DSL) model appropriately describes the equilibrium data for the adsorptives CFC-115 and HFC-125 on Vruf carbon or silicalite-1, respectively. Because HFC-125 molecule has a higher packing efficiency in the pores of Vruf carbon, its saturation capacity extracted by the Tóth model is higher than that for CFC-115. For CFC-115, a “kink” in the isotherm on silicalite-1 is observed at about 4 molecules (unit cell of silicalite-1)−1, and the measured isotherms of CFC-115 for the first time show a second-step adsorption at loadings over 4 molecules (unit cell)−1. This is ascribed to a large difference in the adsorption entropy between the molecular locations in the intersections and in the channels. The DSL model with fixed saturation capacities describes this behavior well. The mixture adsorption isotherms predicted by the ideal adsorbed solution theory show that both adsorbents could be industrially applicable in the separation of CFC-115 and HFC-125. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1010806

Corrosion - resistant zeolite silicalite - 1 Coatings synthesized by seeded growth / Yanjuan Dong in Industrial & engineering chemistry research, Vol. 51 N° 9 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) Titre : Corrosion - resistant zeolite silicalite - 1 Coatings synthesized by seeded growth Type de document : texte imprimé Auteurs : Yanjuan Dong, Auteur ; Yong Peng, Auteur ; Guolong Wang, Auteur Année de publication : 2012 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Corrosion  Zeolite Résumé : It has been proved that zeolite MFI coatings synthesized by in situ hydrothermal synthesis is corrosion-resistant. Pure silica zeolite MFI (silicalite-1) coatings on aluminum alloy 1060 plates seeded by brush-coating a seed paste and leveling the seed layer with fingers have been synthesized by the seeded growth method in this study. The seed paste is composed of seeds, silica sol, and water. The effects of the seed/sol ratio and the seed crystal size on the properties of silicalite-1 coatings are investigated in detail. The corrosion protection performance of the silicalite-1 coatings on aluminum alloy plates is determined by a direct current polarization technique. The silicalite-1 coatings (3 μm thick) obtained by the seeded growth method at 150 °C for 3 h are found to be highly b-oriented and corrosion-resistant in severely corrosive acidic aqueous solution (0.5 M H2SO4) and sodium chloride aqueous solution (0.5 M) exposed to air at room temperature. The optimum seed/sol ratio and the seed crystal size in the seed paste are 6.0 and 500 nm, respectively. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202080a [article] Corrosion - resistant zeolite silicalite - 1 Coatings synthesized by seeded growth [texte imprimé] / Yanjuan Dong, Auteur ; Yong Peng, Auteur ; Guolong Wang, Auteur . - 2012. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) Mots-clés : Corrosion  Zeolite Résumé : It has been proved that zeolite MFI coatings synthesized by in situ hydrothermal synthesis is corrosion-resistant. Pure silica zeolite MFI (silicalite-1) coatings on aluminum alloy 1060 plates seeded by brush-coating a seed paste and leveling the seed layer with fingers have been synthesized by the seeded growth method in this study. The seed paste is composed of seeds, silica sol, and water. The effects of the seed/sol ratio and the seed crystal size on the properties of silicalite-1 coatings are investigated in detail. The corrosion protection performance of the silicalite-1 coatings on aluminum alloy plates is determined by a direct current polarization technique. The silicalite-1 coatings (3 μm thick) obtained by the seeded growth method at 150 °C for 3 h are found to be highly b-oriented and corrosion-resistant in severely corrosive acidic aqueous solution (0.5 M H2SO4) and sodium chloride aqueous solution (0.5 M) exposed to air at room temperature. The optimum seed/sol ratio and the seed crystal size in the seed paste are 6.0 and 500 nm, respectively. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202080a