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Long-term durability of NOx aftertreatment systems for diesel engines

  • Development
  • Exhaust Gas Aftertreatment
  • Published:
MTZ worldwide Aims and scope

Abstract

Lean NOx trap (LNT) systems are currently being improved in order to comply with the more stringent Tier 2 Bin 5 standards. Improving the LNT’s durability is key in this endeavour. The main two aging mechanisms that need to be addressed are thermal deactivation and poisoning with sulphur. The two processes are linked because sulphur poisoning indirectly leads to thermal deactivation through regular desulfations of the catalyst. Those sulphur removal procedures expose the catalyst to considerable thermal stress that reduces its long term performance. Umicore research activities on improved LNT systems and data recorded in durability tests demonstrate substantially improved performance and durability. The main strategies employed were a reduction in the required desulfation temperature of the LNT as well as improved engine control and desulfation strategies.

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Authors and Affiliations

  1. Umicore AG & Co. KG, Hanau-Wolfgang, Germany

    Friedemann Rohr (Senior Manager System Integration),  Ina Grißtede (Head of the Labatories for NOx storage catalysts),  Ulrich Göbel (Senior Manager Application) & Wilfried Müller (Global Technology Director System Integration)

Authors
  1. Friedemann Rohr
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  2. Ina Grißtede
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  3. Ulrich Göbel
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  4. Wilfried Müller
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Rohr, F., Grißtede, I., Göbel, U. et al. Long-term durability of NOx aftertreatment systems for diesel engines. MTZ Worldw 69, 22–27 (2008). https://doi.org/10.1007/BF03226894

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  • DOI: https://doi.org/10.1007/BF03226894

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