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

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Abstract

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.

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Notes

  1. In the following we will use „self-reactivation“ instead of "self-regeneration" to distinguish it from the regeneration step of the NSR process.

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Acknowledgments

M.C. gratefully acknowledges financial support by Umicore Co&KG, also for the beamtime allocations at HASYLAB (DESY, Hamburg).We thank the beamline staff at beamline X1 as well as Matteo Caravati and Stefan Hannemann (ETH Zürich) for the support during our EXAFS measurements.

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Authors and Affiliations

  1. Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Hönggerberg, Zurich, 8093, Switzerland

    Maria Casapu, Jan-Dierk Grunwaldt, Marek Maciejewski & Alfons Baiker

  2. Umicore AG & Co. KG, Rodenbacher Chaussee 4, 63403, Hanau-Wolfgang, Germany

    Rüdiger Hoyer, Meike Wittrock & Stephan Eckhoff

Authors
  1. Maria Casapu
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  2. Jan-Dierk Grunwaldt
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  3. Marek Maciejewski
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  4. Alfons Baiker
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  5. Rüdiger Hoyer
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  6. Meike Wittrock
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  7. Stephan Eckhoff
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Corresponding authors

Correspondence to Jan-Dierk Grunwaldt or Alfons Baiker.

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Casapu, M., Grunwaldt, JD., Maciejewski, M. et al. Enhancement of Activity and Self-reactivation of NSR-catalysts by Temporary Formation of BaPtO3-perovskite. Catal Lett 120, 1–7 (2008). https://doi.org/10.1007/s10562-007-9332-1

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  • DOI: https://doi.org/10.1007/s10562-007-9332-1

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