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A Study of the Soot Combustion Efficiency of an SCRF® Catalyst vs a CSF During Active Regeneration

  • Special Issue: 2016 CLEERS April 6-8, Ann Arbor, MI, USA
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Abstract

The soot combustion efficiency of a Pt-based catalyzed soot filter (CSF) was compared to a Cu-SCR catalyst-coated soot filter (SCRF® catalyst) under active regeneration conditions. The CSF was found to have a significantly higher soot combustion efficiency compared to the SCRF® catalyst under typical active regeneration conditions (550–600 °C). Despite the thermodynamic equilibrium limitation of the NO oxidation reaction at high temperatures and the relatively small quantity of NOx in diesel exhaust compared to O2, there is sufficient NO2 production capacity in a CSF where the impact of NO2 to the overall soot combustion efficiency under active regeneration conditions is significant. The differences between a standard porosity filter typically used for a CSF vs a high-porosity filter used for an SCRF® catalyst can only account for a minor portion of the difference in the soot combustion efficiency observed between the CSF and SCRF® catalyst. The fast consumption of the NO2 produced in situ in the CSF by soot may be driving the thermodynamic equilibrium of the NO oxidation reaction to continuously produce more NO2 for further soot combustion during active regeneration, resulting in a significant increase in the soot combustion efficiency in a CSF compared to an SCRF® catalyst or an uncoated filter.

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Acknowledgements

We would like to thank Johnson Matthey Plc. and Johnson Matthey Inc. for permission to publish this paper. We would also like to thank Megan Kardine and Claire Storms for preparing some of the catalysts used in this study.

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Authors and Affiliations

  1. Emission Control Technologies, Johnson Matthey Inc, Audubon, PA, 19403, USA

    Lasitha Cumaranatunge & Sougato Chatterjee

  2. Emission Control Technologies, Johnson Matthey PLC, Royston, SG8 5HE, UK

    Andrew Chiffey

  3. Emission Control Technologies, Johnson Matthey Inc, Wayne, PA, 19087, USA

    Joel Stetina, Kevin McGonigle, Griffin Repley & Andrew Lee

Authors
  1. Lasitha Cumaranatunge
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  2. Andrew Chiffey
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  3. Joel Stetina
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  4. Kevin McGonigle
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  5. Griffin Repley
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  6. Andrew Lee
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  7. Sougato Chatterjee
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Correspondence to Lasitha Cumaranatunge.

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Cumaranatunge, L., Chiffey, A., Stetina, J. et al. A Study of the Soot Combustion Efficiency of an SCRF® Catalyst vs a CSF During Active Regeneration. Emiss. Control Sci. Technol. 3, 93–104 (2017). https://doi.org/10.1007/s40825-016-0059-6

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  • DOI: https://doi.org/10.1007/s40825-016-0059-6

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