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Enhancement of Activity and Self-reactivation of NSR-catalysts by Temporary Formation of BaPtO3-perovskite

Casapu, Maria ; Grunwaldt, Jan-Dierk ; Maciejewski, Marek ; Baiker, Alfons ; Hoyer, Rüdiger ; Wittrock, Meike ; Eckhoff, Stephan

In: Catalysis Letters, 2008, vol. 120, no. 1-2, p. 1-7

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    Title
    • Enhancement of Activity and Self-reactivation of NSR-catalysts by Temporary Formation of BaPtO3-perovskite
    Author
    • Casapu, Maria. Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Hönggerberg, 8093, Zurich, Switzerland
    • Grunwaldt, Jan-Dierk. Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Hönggerberg, 8093, Zurich, Switzerland
    • Maciejewski, Marek. Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Hönggerberg, 8093, Zurich, Switzerland
    • Baiker, Alfons. Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Hönggerberg, 8093, Zurich, Switzerland
    • Hoyer, Rüdiger. Umicore AG & Co. KG, Rodenbacher Chaussee 4, 63403, Hanau-Wolfgang, Germany
    • Wittrock, Meike. Umicore AG & Co. KG, Rodenbacher Chaussee 4, 63403, Hanau-Wolfgang, Germany
    • Eckhoff, Stephan. Umicore AG & Co. KG, Rodenbacher Chaussee 4, 63403, Hanau-Wolfgang, Germany
    Document Type
    • Postprint
    Language
    • English
    Published in
    • Catalysis Letters, 2008, vol. 120, no. 1-2, p. 1-7. Springer US; http://www.springer-ny.com
    Other Version
    OAI-PMH Identifier
    • oai:doc.rero.ch:311983
    Summary
    Calcination of a Pt/Ba/CeO2 catalyst at 700°C and subsequent reduction in hydrogen, carbon monoxide or propene at 350-550°C resulted in a considerable improvement of its NO x storage-reduction (NSR) properties compared to those of a freshly prepared Pt/Ba/CeO2 catalyst. This behavior is traced back to the temporary formation of BaPtO3 perovskite which leads after reduction to well-distributed Pt particles in intimate contact with the barium-containing phases. The oxidation and reduction of platinum is reversible which can be exploited for the design of "self-regenerating” NSR-catalysts under lean (>600°C) and rich (>400°C) reaction conditions. The formation of the BaPtO3-perovskite may not only be interesting for NSR-catalysis, but generally for Pt-based catalysts where a high dispersion of Pt is important