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Overview: Status of the Microwave-Based Automotive Catalyst State Diagnosis

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Abstract

The oxygen loading degree in TWCs, the amount of stored ammonia in SCR catalysts, the NOx loading degree in LNTs, or the soot loading of DPFs play a key role in automotive exhaust gas aftertreatment. Today’s methods determine the catalyst state indirectly. They utilize gas sensors installed up- or downstream of the catalysts and the catalyst state is inferred from the sensor signals. This overview reports on the status of an alternative approach based on the interaction of electromagnetic microwaves with the catalyst material. Since the catalyst state is strongly correlated with the electrical properties of the catalyst material itself, this concept shows a great potential.

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Acknowledgments

The authors are indebted to the German Research Foundation (DFG) for financial support under grant numbers MO 1060/6-2, MO 1060/13-1, FI 956/3-2, and FI 956/5-1.

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Authors and Affiliations

  1. Bayreuth Engine Research Center, 95440, Bayreuth, Germany

    Ralf Moos, Gregor Beulertz, Sebastian Reiß, Gunter Hagen & Gerhard Fischerauer

  2. Umicore AG & Co. KG, 63403, Hanau, Germany

    Martin Votsmeier & Jürgen Gieshoff

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  1. Ralf Moos
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  2. Gregor Beulertz
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  3. Sebastian Reiß
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  4. Gunter Hagen
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  5. Gerhard Fischerauer
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  6. Martin Votsmeier
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  7. Jürgen Gieshoff
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Correspondence to Ralf Moos.

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Moos, R., Beulertz, G., Reiß, S. et al. Overview: Status of the Microwave-Based Automotive Catalyst State Diagnosis. Top Catal 56, 358–364 (2013). https://doi.org/10.1007/s11244-013-9980-x

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