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Sulfonic acid-functionalized catalysts for the valorization of glycerol via transesterification with methyl acetate / Gabriel Morales in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 5898-5906 Titre : Sulfonic acid-functionalized catalysts for the valorization of glycerol via transesterification with methyl acetate Type de document : texte imprimé Auteurs : Gabriel Morales, Auteur ; Marta Paniagua, Auteur ; Juan A. Melero, Auteur Année de publication : 2011 Article en page(s) : pp. 5898-5906 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Transesterification  Upgrading  Catalyst Résumé : Sulfonic acid-functionalized mesostructured SBA-15 silicas have been demonstrated to be active for the catalytic transesterification of glycerol with methyl acetate to produce di- and triacetylglycerols. An optimization of the reaction conditions carried out with pharmaceutical glycerol by means of experimental design methodology showed that it is necessary to use a high methyl acetate to glycerol molar ratio (50:1) and a high catalyst loading (7.5 wt % based on glycerol) in order to obtain simultaneously very high glycerol conversion (99.5%) and high combined selectivity toward di- and triacetylglycerols (74.2%). In addition, the formation of nondesired byproduct was minimized at such reaction conditions. The activity displayed by arenesulfonic acid-functionalized mesostructured silica was comparable to that displayed by commercial catalysts such as the resin Amberlyst-70 or the composite Nafion-SAC-13. The acid strength of the catalytic sites, and in less extent their surface density, proved to be the most influential parameters in this reaction. Arenesulfonic SBA-15 also provided suitable conversions and selectivities with technical-grade glycerol, although not with crude glycerol due to the deactivating effect of salts. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158885 [article] Sulfonic acid-functionalized catalysts for the valorization of glycerol via transesterification with methyl acetate [texte imprimé] / Gabriel Morales, Auteur ; Marta Paniagua, Auteur ; Juan A. Melero, Auteur . - 2011 . - pp. 5898-5906. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 5898-5906 Mots-clés : Transesterification  Upgrading  Catalyst Résumé : Sulfonic acid-functionalized mesostructured SBA-15 silicas have been demonstrated to be active for the catalytic transesterification of glycerol with methyl acetate to produce di- and triacetylglycerols. An optimization of the reaction conditions carried out with pharmaceutical glycerol by means of experimental design methodology showed that it is necessary to use a high methyl acetate to glycerol molar ratio (50:1) and a high catalyst loading (7.5 wt % based on glycerol) in order to obtain simultaneously very high glycerol conversion (99.5%) and high combined selectivity toward di- and triacetylglycerols (74.2%). In addition, the formation of nondesired byproduct was minimized at such reaction conditions. The activity displayed by arenesulfonic acid-functionalized mesostructured silica was comparable to that displayed by commercial catalysts such as the resin Amberlyst-70 or the composite Nafion-SAC-13. The acid strength of the catalytic sites, and in less extent their surface density, proved to be the most influential parameters in this reaction. Arenesulfonic SBA-15 also provided suitable conversions and selectivities with technical-grade glycerol, although not with crude glycerol due to the deactivating effect of salts. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158885