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Effect of the Proximity of Pt to Ce or Ba in Pt/Ba/CeO2 Catalysts on NO x Storage–Reduction Performance

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Abstract

The effect of Pt location in Pt/Ba/CeO2 catalysts for NO x storage–reduction (NSR) was analyzed. The Pt location on BaCO3 or CeO2 support was controlled by changing the angle (φ) between the two flame sprays producing these two components. As-prepared flame-made catalysts contain PtO x which must be reduced during the fuel rich phase to become active for NO x storage and reduction of NO x . For Pt on BaCO3 this process was significantly faster than for Pt on CeO2. The increased reduction ability of Pt on Ba is reflected in the light off temperatures: for Pt on CeO2 temperatures around 330 °C were needed to combust 20% of C3H6 in air while for Pt on BaCO3 only 250 °C were required for the same conversion. The ability to control the location of Pt or other noble metals is, therefore, essential to optimize the catalysts for a given Pt/Ba/CeO2 weight ratio. The best performance was observed when most of the Pt constituent was located near Ba-containing sites.

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Acknowledgments

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

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Author notes

  1. Reto Strobel

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

Authors and Affiliations

  1. Particle Technology Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, Zurich, 8092, 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, Zurich, 8093, 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. Effect of the Proximity of Pt to Ce or Ba in Pt/Ba/CeO2 Catalysts on NO x Storage–Reduction Performance. Top Catal 52, 1709–1712 (2009). https://doi.org/10.1007/s11244-009-9330-1

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  • DOI: https://doi.org/10.1007/s11244-009-9330-1

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