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Step changes and deactivation behavior in the continuous decarboxylation of stearic acid / Anders Theilgaard Madsen in Industrial & engineering chemistry research, Vol. 50 N° 19 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11049-11058 Titre : Step changes and deactivation behavior in the continuous decarboxylation of stearic acid Type de document : texte imprimé Auteurs : Anders Theilgaard Madsen, Auteur ; Bartosz Rozmysłowicz, Auteur ; Irina L. Simakova, Auteur Année de publication : 2011 Article en page(s) : pp. 11049-11058 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Deactivation Résumé : Deoxygenation of dilute and concentrated stearic acid over 2% Pd/C beads was performed in a continuous reactor at 300 °C and 20 bar pressure of Ar or 5% H2/Ar. Stable operation was obtained in 5% H2 atmosphere, with 95% conversion of 10 mol % dilute stearic acid in dodecane and 12% conversion of pure stearic acid. Deactivation took place in H2-deficient gas atmosphere, probably as a result of the formation of unsaturated products and coking in the pore system. Transient experiments with step changes were performed: 1 h was required for the step change to be visible in liquid sampling, whereas steady states were achieved after a total of 2.5―3 h. Postreaction analysis of the spent catalyst revealed that a deactivation profile was formed downward over the catalyst bed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24573302 [article] Step changes and deactivation behavior in the continuous decarboxylation of stearic acid [texte imprimé] / Anders Theilgaard Madsen, Auteur ; Bartosz Rozmysłowicz, Auteur ; Irina L. Simakova, Auteur . - 2011 . - pp. 11049-11058. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11049-11058 Mots-clés : Deactivation Résumé : Deoxygenation of dilute and concentrated stearic acid over 2% Pd/C beads was performed in a continuous reactor at 300 °C and 20 bar pressure of Ar or 5% H2/Ar. Stable operation was obtained in 5% H2 atmosphere, with 95% conversion of 10 mol % dilute stearic acid in dodecane and 12% conversion of pure stearic acid. Deactivation took place in H2-deficient gas atmosphere, probably as a result of the formation of unsaturated products and coking in the pore system. Transient experiments with step changes were performed: 1 h was required for the step change to be visible in liquid sampling, whereas steady states were achieved after a total of 2.5―3 h. Postreaction analysis of the spent catalyst revealed that a deactivation profile was formed downward over the catalyst bed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24573302