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The effect of exothermic reactions during regeneration on the NOX trapping efficiency of a NOX storage/reduction catalyst

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Abstract

An unusual behavior was observed during experiments conducted at 371 and 465 °C with a commercial NOX storage/reduction catalyst: the outlet NOX concentration during the trapping phase reached a cycle minimum after regeneration, increased for 20–30 s, as expected, but then surprisingly decreased, indicating the catalyst had become more efficient in trapping the entering NOX. The results reported in this letter indicate that this phenomenon was caused by a superposition of two factors: a substantial exotherm associated with the regeneration event from reductant reacting with surface oxygen species and a negative impact of an evolving temperature profile on the dynamic NOX storage capacity.

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Authors and Affiliations

  1. Department of Chemical Engineering, University of Waterloo, 200, University Ave West, Waterloo, Ontario, N2L 3G1, Canada

    William S. Epling

  2. Cummins, Inc, MC 50183, 1900, McKinley Ave, Columbus, IN, 47201, USA

    Aleksey Yezerets & Neal W. Currier

Authors
  1. William S. Epling
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  2. Aleksey Yezerets
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  3. Neal W. Currier
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Epling, W.S., Yezerets, A. & Currier, N.W. The effect of exothermic reactions during regeneration on the NOX trapping efficiency of a NOX storage/reduction catalyst. Catal Lett 110, 143–148 (2006). https://doi.org/10.1007/s10562-006-0102-2

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  • DOI: https://doi.org/10.1007/s10562-006-0102-2

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