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NOx Abatement for Diesel Engines: Reductant Effects; Engine vs. Reactor Tests
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English
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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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.Also In
References
- Feeley, J. S. Deeba, M. Farrauto, R. J. 1995 Abatement of NO x from Diesel Engines: Status and Technical Challenges Society of Automotive Engineering SAE 950747
- Deeba, M. Feeley, J. S. Farrauto, R. J. Steinbock, N. Punke, A. 1995 Catalytic Abatement of NO x from Diesel Engines: Development of Four Way Catalyst Society of Automotive Engineering SAE 952491
- Leyrer, J. Lox, E. S. Strehlau, W. 1995 Design Aspects of Lean NO x Catalysts for Gasoline and Diesel Applications Society of Automotive Engineering SAE 952495