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Topics in Catalysis

, Volume 52, Issue 13–20, pp 2035–2040 | Cite as

Direct Catalyst Monitoring by Electrical Means: An Overview on Promising Novel Principles

  • Ralf MoosEmail author
  • Marion Wedemann
  • Matthias Spörl
  • Sebastian Reiß
  • Gerhard Fischerauer
Original Paper

Abstract

By measuring the electrical properties of the catalyst coating itself, one can observe directly and in situ the state of TWC, LNT, and SCR catalysts. Two principles are possible: a contact method, for which the coating is applied to planar electrodes and the electrical impedance is measured, and a non-contact method, in which the coating material is penetrated by radio frequency waves. In either case, the catalyst state is directly correlated with the measured transmission or reflection characteristics of the electrical sensors.

Keywords

Catalyst status detection On-Board Diagnosis (OBD) Exhaust gas sensor TWC LNT 

Notes

Acknowledgment

The authors are indebted to Umicore (Dr. J. Gieshoff, Dr. U. Göbel, Dr. M. Rösch, Dr. M. Votsmeier) for providing catalyst samples.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Ralf Moos
    • 1
    Email author
  • Marion Wedemann
    • 1
  • Matthias Spörl
    • 1
  • Sebastian Reiß
    • 1
  • Gerhard Fischerauer
    • 1
  1. 1.Bayreuth Engine Research CenterBayreuthGermany

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