The potential of ceramic foams as fixed bed catalyst carriers in the partial oxidation ofo-xylene to phthalic anhydride was evaluated by means of numerical simulations. One- and two-dimensional, pseudohomogeneous reactor models were used to compare the performances affixed bed reactors filled with foam packings and with spherical catalvst bodies, both of which coated with the same catalyst. The results show that foam packings enable a highly selective and more efficient operation of PA reactors. The improved heat transfer properties, higher specific surface areas and higher porosities of foam packings allow for a stretching of the operational window to more severe process conditions while the danger of catalyst deactivation and thermal runaways is reduced. The results indicate that the space-time-yield of phthalic anhydride could be more than doubled, if conventional fixed beds of catalyst particles would be replaced by foam packings.

Flame-made airborne V2O5/TiO2 nanoparticles were deposited directly onto mullite foam supports to create ready-to-use catalysts for the o-xylene conversion to phthalic anhydride. These particles containing 10% (w/w) V2O5 were created by combustion of liquid precursor sprays and characterized by transmission electron microscopy, nitrogen adsorption, X-ray diffraction (XRD), temperature-programmed reduction (TPR), and Raman spectroscopy. The specific surface area, anatase content, and dominantly monomeric vanadia species on titania were thermally stable up to 450 degrees C. Catalyst structure was controlled in situ during deposition by the particle-laden gas flow rate through the foam, resulting in homogeneous to patchy V2O5/TiO2 coatings. The catalytic activity and selectivity were affected by both coating texture and particle morphology. These flame-coated foams showed superior catalytic activity and selectivity at high conversions than classic, wet-made V2O5/TiO2 catalysts. (c) 2006 Elsevier Inc. All rights reserved.

Chemie Ingenieur TechnikVolume 77, Issue 8 p. 979-979 Vortrag Strukturierung eines Reaktors durch katalytische Schwämme für die partielle Oxidation von o-Xylol zu Phthalsäureanhydrid P. M. Pias Peleteiro, P. M. Pias Peleteiro Universität Karlsruhe, Institut für Chemische Verfahrenstechnik, Kaiserstraße 12, D-76128 KarlsruheSearch for more papers by this authorA. Bareiss Dipl.-Ing., A. Bareiss Dipl.-Ing. anika.bareiss@cvt.uni-karlsruhe.de Universität Karlsruhe, Institut für Chemische Verfahrenstechnik, Kaiserstraße 12, D-76128 KarlsruheSearch for more papers by this authorA. Reitzmann Dr.-Ing., A. Reitzmann Dr.-Ing. Universität Karlsruhe, Institut für Chemische Verfahrenstechnik, Kaiserstraße 12, D-76128 KarlsruheSearch for more papers by this authorB. Kraushaar-Czarnetzki Prof. Dr., B. Kraushaar-Czarnetzki Prof. Dr. Universität Karlsruhe, Institut für Chemische Verfahrenstechnik, Kaiserstraße 12, D-76128 KarlsruheSearch for more papers by this author P. M. Pias Peleteiro, P. M. Pias Peleteiro Universität Karlsruhe, Institut für Chemische Verfahrenstechnik, Kaiserstraße 12, D-76128 KarlsruheSearch for more papers by this authorA. Bareiss Dipl.-Ing., A. Bareiss Dipl.-Ing. anika.bareiss@cvt.uni-karlsruhe.de Universität Karlsruhe, Institut für Chemische Verfahrenstechnik, Kaiserstraße 12, D-76128 KarlsruheSearch for more papers by this authorA. Reitzmann Dr.-Ing., A. Reitzmann Dr.-Ing. Universität Karlsruhe, Institut für Chemische Verfahrenstechnik, Kaiserstraße 12, D-76128 KarlsruheSearch for more papers by this authorB. Kraushaar-Czarnetzki Prof. Dr., B. Kraushaar-Czarnetzki Prof. Dr. Universität Karlsruhe, Institut für Chemische Verfahrenstechnik, Kaiserstraße 12, D-76128 KarlsruheSearch for more papers by this author First published: 10 August 2005 https://doi.org/10.1002/cite.200580026AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume77, Issue8Special Issue: GVC/DECHEMA‐JahrestagungenAugust, 2005Pages 979-979 RelatedInformation