Topics in Catalysis

, Volume 56, Issue 1–8, pp 293–297 | Cite as

Effect of Hydrothermal Aging on Physical and Chemical Properties of a Commercial NOx-Storage Catalyst

  • Denise Chan
  • Andreas Gremminger
  • Olaf Deutschmann
Original Paper

Abstract

Fuel consumption for NOx trap regeneration depends on the regeneration frequency, which is a function of NOx trap performance parameters. Hence, the impact of thermal aging must be considered in the operation strategy. For this purpose, the effect of thermal aging on the physical and chemical properties of a commercial NOx storage/reduction catalyst containing Pt/Pd/Rh has been investigated. After thermal treatment under various conditions, the samples were characterized using CO chemisorption measurements, X-ray diffraction (XRD), N2 physisorption, and electron microscopy. It is shown that the major impact of lean hydrothermal treatment on the catalyst activity is the continuous decrease of the specific surface area with aging temperature due to collapse of smaller pores. The noble metal nanoparticles remained highly dispersed, even after lean aging at 800 °C. In contrast, noble metal sintering represents the main aging effect of lean/rich cycling at elevated temperatures. Furthermore, XRD and selected area electron diffraction revealed a significant loss of crystallinity for the barium component in consequence of lean/rich aging treatment. However, independent from the aging treatment, no formation of mixed oxides could be observed.

Keywords

Commercial NOx storage/reduction catalyst Aging XRD BET HR-TEM/EDX CO chemisorption 

Notes

Acknowledgments

The authors gratefully acknowledge the Forschungsvereinigung Verbrennungskraftmaschinen e.V. (FVV) for the financial support, Umicore AG & Co. KG for providing the catalyst and K. Hauff and U. Nieken (ICVT, University of Stuttgart) for catalyst pretreatment and the good cooperation within the FVV project. This work was partly carried out with the support of the Karlsruhe Nano Micro Facility (KNMF, www.kit.edu/knmf), a Helmholtz Research Infrastructure at Karlsruhe Institute of Technology (KIT, www.kit.edu). The authors thank D. Wang for support during TEM/STEM measurements.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Denise Chan
    • 1
  • Andreas Gremminger
    • 1
  • Olaf Deutschmann
    • 1
  1. 1.Institute for Chemical Technology and Polymer ChemistryKarlsruhe Institute of Technology (KIT)KarlsruheGermany

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