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Flame-Made Pt/K/Al2O3 for NO x Storage–Reduction (NSR) Catalysts

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Abstract

High surface area Pt/K/Al2O3 catalysts were prepared with a 2-nozzle flame spray method resulting in Pt clusters on γ-Al2O3 and amorphous K storage material as evidenced by Raman spectroscopy. The powders had a high NO x storage capacity and were regenerated fast in a model exhaust gas environment. From 300 to 400 °C no excess NO x was detected in the off gas during transition from fuel lean to fuel rich conditions, resulting in a highly effective NO x removal performance. Above 500 °C, the NSR activity was lost and not recovered at lower temperatures as K-compounds were partially crystallized on the catalyst.

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Acknowledgements

We thank for the financial support by ETH Zürich (TH-09 06-2) and the contribution of platinum chemicals by Johnson Matthey PLC is greatly appreciated.

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Author notes

  1. Reto Strobel

    Present address: Satisloh Photonics AG, 8812, Horgen, Switzerland

Authors and Affiliations

  1. Particle Technology Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092, Zurich, Switzerland

    Robert Büchel, Reto Strobel & Sotiris E. Pratsinis

  2. Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093, Zurich, Switzerland

    Robert Büchel & Alfons Baiker

Authors
  1. Robert Büchel
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  2. Reto Strobel
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  3. Alfons Baiker
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  4. Sotiris E. Pratsinis
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Corresponding author

Correspondence to Sotiris E. Pratsinis.

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Büchel, R., Strobel, R., Baiker, A. et al. Flame-Made Pt/K/Al2O3 for NO x Storage–Reduction (NSR) Catalysts. Top Catal 52, 1799–1802 (2009). https://doi.org/10.1007/s11244-009-9334-x

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  • DOI: https://doi.org/10.1007/s11244-009-9334-x

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