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Performance and Kinetics of Flame-Made Vanadia/Titania Catalyst Nanoparticles in the Partial Oxidation of o-Xylene / Philip Mulheims in Industrial & engineering chemistry research, Vol. 51 N° 43 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 13980-13992 Titre : Performance and Kinetics of Flame-Made Vanadia/Titania Catalyst Nanoparticles in the Partial Oxidation of o-Xylene Type de document : texte imprimé Auteurs : Philip Mulheims, Auteur ; Anika Ritter, Auteur ; Andreas Reitzmann, Auteur Année de publication : 2013 Article en page(s) : pp. 13980-13992 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Partial  oxidation  Nanoparticle  Catalyst  Flame  Kinetics Résumé : Vanadia/titania catalyst particles were made by flame-spray pyrolysis and deposited onto ceramic sponge monoliths either by direct deposition of the flame-made particles or by a dip-coating technique. In the partial oxidation of o-xylene, the influence of the coating thickness and porosity on the catalytic performance was investigated. It was found that the highly porous coatings obtained by direct deposition exhibit insufficient heat transfer properties, while dip-coated layers are prone to internal mass transfer limitations if a certain thickness of the coating is exceeded. In the absence of transport limitations, kinetic experiments were carried out to derive a reaction network and to develop a quantitative kinetic model. The resulting model describes well the influences of reactant concentrations and temperature on the product distributions in the oxidation of o-xylene to phthalic anhydride over the novel flame-made catalyst and can be used for reactor simulations. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593325 [article] Performance and Kinetics of Flame-Made Vanadia/Titania Catalyst Nanoparticles in the Partial Oxidation of o-Xylene [texte imprimé] / Philip Mulheims, Auteur ; Anika Ritter, Auteur ; Andreas Reitzmann, Auteur . - 2013 . - pp. 13980-13992. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 13980-13992 Mots-clés : Partial  oxidation  Nanoparticle  Catalyst  Flame  Kinetics Résumé : Vanadia/titania catalyst particles were made by flame-spray pyrolysis and deposited onto ceramic sponge monoliths either by direct deposition of the flame-made particles or by a dip-coating technique. In the partial oxidation of o-xylene, the influence of the coating thickness and porosity on the catalytic performance was investigated. It was found that the highly porous coatings obtained by direct deposition exhibit insufficient heat transfer properties, while dip-coated layers are prone to internal mass transfer limitations if a certain thickness of the coating is exceeded. In the absence of transport limitations, kinetic experiments were carried out to derive a reaction network and to develop a quantitative kinetic model. The resulting model describes well the influences of reactant concentrations and temperature on the product distributions in the oxidation of o-xylene to phthalic anhydride over the novel flame-made catalyst and can be used for reactor simulations. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593325

Temperature profiles and process performances of sponge packings as compared to spherical catalysts in the oxidation of o-xylene to phthalic anhydride / Philip Mulheims in Industrial & engineering chemistry research, Vol. 50 N° 17 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 9925-9935 Titre : Temperature profiles and process performances of sponge packings as compared to spherical catalysts in the oxidation of o-xylene to phthalic anhydride Type de document : texte imprimé Auteurs : Philip Mulheims, Auteur ; Bettina Kraushaar-Czarnetzki, Auteur Année de publication : 2011 Article en page(s) : pp. 9925-9935 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Oxidation  Catalyst  Temperature  distribution Résumé : The oxidation of o-xylene to phthalic anhydride was carried out in a pilot plant with a tubular reactor in order to investigate the heat transfer properties of different types of catalytic fixed beds through analysis of the temperature profiles arising upon polytropic o-xylene conversion. Ceramic sponges of different materials and pore densities were compared to a packed bed of spheres, all of which were coated with novel flame-made vanadia/titania catalyst nanoparticles. The temperature profiles were smoother and hot spot temperatures were found to be lower when sponges were employed as catalyst supports. The strongest reduction of the hot spot temperature was achieved with a sponge packing made of silicon carbide, showing the potential to significantly improve the productivity of the process. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483636 [article] Temperature profiles and process performances of sponge packings as compared to spherical catalysts in the oxidation of o-xylene to phthalic anhydride [texte imprimé] / Philip Mulheims, Auteur ; Bettina Kraushaar-Czarnetzki, Auteur . - 2011 . - pp. 9925-9935. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 9925-9935 Mots-clés : Oxidation  Catalyst  Temperature  distribution Résumé : The oxidation of o-xylene to phthalic anhydride was carried out in a pilot plant with a tubular reactor in order to investigate the heat transfer properties of different types of catalytic fixed beds through analysis of the temperature profiles arising upon polytropic o-xylene conversion. Ceramic sponges of different materials and pore densities were compared to a packed bed of spheres, all of which were coated with novel flame-made vanadia/titania catalyst nanoparticles. The temperature profiles were smoother and hot spot temperatures were found to be lower when sponges were employed as catalyst supports. The strongest reduction of the hot spot temperature was achieved with a sponge packing made of silicon carbide, showing the potential to significantly improve the productivity of the process. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483636