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Hydrogenation of sunflower oil over different palladium supported catalysts / Maria B. Fernàndez in Chemical engineering journal, Vol. 155 N° 3 (Decembre 2009) 

Public ISBD [article]  in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 941-949 Titre : Hydrogenation of sunflower oil over different palladium supported catalysts : activity and selectivity Type de document : texte imprimé Auteurs : Maria B. Fernàndez, Auteur ; Jhon F. Sánchez M., Auteur ; Tonetto, Gabriela M., Auteur Année de publication : 2010 Article en page(s) : pp. 941-949 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Hydrogenation  Isomerization  Palladium  Sunflower  oil  Trans-isomers Index. décimale : 660 Résumé : Six palladium catalysts were prepared using different precursors (palladium acetylacetonate, palladium nitrate and tetraamminepalladium nitrate) and supports (α-Al2O3, γ-Al2O3, ZSM-5, and MCM-22). The samples were characterized by atomic absorption spectroscopy, N2 adsorption isotherms, XRD, H2 chemisorption, transmission electron microscopy and temperature programmed reduction. The activity and selectivity of the catalysts were investigated in the hydrogenation of sunflower oil and compared to a commercial Ni catalyst. Pd catalysts showed a higher activity, similar trans-isomer formation, and were more selective towards monoene formation than Ni catalysts. On the other hand, under the studied operating conditions, the different supports did not improve significantly the selectivity or the activity of the reaction. The γ-alumina supported Pd catalyst, with a metal loading of 0.78 wt% and a 60% dispersion, showed a specific activity higher than the other Pd catalysts. For the same double bond conversion, this sample originated a slightly lower amount of total trans-isomers than the Ni catalyst, but it produced less saturated compound and was more selective towards monounsaturated fatty acid formation. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XB79WP-2&_user=6 [...] [article] Hydrogenation of sunflower oil over different palladium supported catalysts : activity and selectivity [texte imprimé] / Maria B. Fernàndez, Auteur ; Jhon F. Sánchez M., Auteur ; Tonetto, Gabriela M., Auteur . - 2010 . - pp. 941-949. Génie Chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 941-949 Mots-clés : Hydrogenation  Isomerization  Palladium  Sunflower  oil  Trans-isomers Index. décimale : 660 Résumé : Six palladium catalysts were prepared using different precursors (palladium acetylacetonate, palladium nitrate and tetraamminepalladium nitrate) and supports (α-Al2O3, γ-Al2O3, ZSM-5, and MCM-22). The samples were characterized by atomic absorption spectroscopy, N2 adsorption isotherms, XRD, H2 chemisorption, transmission electron microscopy and temperature programmed reduction. The activity and selectivity of the catalysts were investigated in the hydrogenation of sunflower oil and compared to a commercial Ni catalyst. Pd catalysts showed a higher activity, similar trans-isomer formation, and were more selective towards monoene formation than Ni catalysts. On the other hand, under the studied operating conditions, the different supports did not improve significantly the selectivity or the activity of the reaction. The γ-alumina supported Pd catalyst, with a metal loading of 0.78 wt% and a 60% dispersion, showed a specific activity higher than the other Pd catalysts. For the same double bond conversion, this sample originated a slightly lower amount of total trans-isomers than the Ni catalyst, but it produced less saturated compound and was more selective towards monounsaturated fatty acid formation. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XB79WP-2&_user=6 [...]

Monolithic stirrer reactor / Diego E. Boldrini in Industrial & engineering chemistry research, Vol. 51 N° 38 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 38 (Septembre 2012) . - pp. 12222-12232 Titre : Monolithic stirrer reactor : Performance in the partial hydrogenation of sunflower oil Type de document : texte imprimé Auteurs : Diego E. Boldrini, Auteur ; Jhon F. Sánchez M., Auteur ; Tonetto, Gabriela M., Auteur Année de publication : 2012 Article en page(s) : pp. 12222-12232 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hydrogenation  Reactor  Agitator  Monolithic  construction Résumé : In the present paper, the performance of monolithic catalysts obtained from a catalytic converter was analyzed in the partial hydrogenation of sunflower oil. The monoliths were reimpregnated with palladium and installed as a blade in a monolithic stirrer reactor. The use of this type of reactor was explored in the reaction at 373 K and 413 kPa, analyzing the effect variables such as stirrer speed, hydrogen supply, and stirrer design on the catalyst activity and selectivity to trans-isomers and saturated product. The volumetric gas–liquid and liquid–solid mass transfer coefficients were calculated, and the influence of the stirrer speed was examined. Estimations of the Carberry numbers and Weisz–Prater modulus were used for establishing the presence or absence of mass transfer resistances. The performance of the catalyst was studied in consecutive tests, and different procedures for catalyst regeneration were applied. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26399672 [article] Monolithic stirrer reactor : Performance in the partial hydrogenation of sunflower oil [texte imprimé] / Diego E. Boldrini, Auteur ; Jhon F. Sánchez M., Auteur ; Tonetto, Gabriela M., Auteur . - 2012 . - pp. 12222-12232. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 38 (Septembre 2012) . - pp. 12222-12232 Mots-clés : Hydrogenation  Reactor  Agitator  Monolithic  construction Résumé : In the present paper, the performance of monolithic catalysts obtained from a catalytic converter was analyzed in the partial hydrogenation of sunflower oil. The monoliths were reimpregnated with palladium and installed as a blade in a monolithic stirrer reactor. The use of this type of reactor was explored in the reaction at 373 K and 413 kPa, analyzing the effect variables such as stirrer speed, hydrogen supply, and stirrer design on the catalyst activity and selectivity to trans-isomers and saturated product. The volumetric gas–liquid and liquid–solid mass transfer coefficients were calculated, and the influence of the stirrer speed was examined. Estimations of the Carberry numbers and Weisz–Prater modulus were used for establishing the presence or absence of mass transfer resistances. The performance of the catalyst was studied in consecutive tests, and different procedures for catalyst regeneration were applied. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26399672