NOx Abatement for Diesel Engines: Reductant Effects; Engine vs. Reactor Tests

Paper #:
  • 962043

Published:
  • 1996-10-01
Citation:
Rice, G., Deeba, M., and Feeley, J., "NOx Abatement for Diesel Engines: Reductant Effects; Engine vs. Reactor Tests," SAE Technical Paper 962043, 1996, https://doi.org/10.4271/962043.
Pages:
10
Abstract:
Catalytic reduction of NOx from heavy duty diesel engines via addition of reductant to the exhaust is accompanied by a substantial exotherm in the catalyst bed which does not occur, for example, in a diesel oxidation catalyst. Engine tests show that thermal management in the aftertreatment system is required for optimum reductant use and maximum NOx conversion by the low-temperature (200-300°C) catalyst NSP-5, but of less importance with the high temperature (> 350°C) Catalyst A. Understanding thermal effects is also important for reconciling test results in the near-adiabatic environment of a full-sized catalyst on an engine with the near-isothermal one of a test piece in a laboratory reactor. The effects of reductant type and concentration on NOx conversion on NSP-5 were shown to result in part from non-steady state behavior of the catalyst during steady state engine operation.
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