Urea-selective catalytic reduction (SCR) catalysts are regarded as the leading aftertreatment technology to meet the 2010 emission standards for on-highway vehicles running on heavy duty diesel engines. However, issues such as low conversion at low temperature conditions still exist due to various factors, including incomplete urea thermolysis, inhibition of SCR reactions by hydrocarbons, and . We have observed a noticeable reduction in the standard SCR reaction efficiency at low temperature with increasing water content. We observed a similar effect when hydrocarbons are present in the stream. This effect is absent under fast SCR conditions where in the feed gas. As a first step in understanding the effects of such inhibition on SCR reaction steps, kinetic models that predict the inhibition behavior of and hydrocarbons on NO oxidation are presented in the paper. A one-dimensional SCR model was developed based on the conservation of species equations and was coded as a C-language S-function and implemented in MATLAB/SIMULINK environment. NO oxidation and dissociation kinetics were defined as a function of the respective adsorbate’s storage in the Fe–zeolite SCR catalyst. The corresponding kinetic models were then validated on temperature ramp tests that showed good match with the test data. Such inhibition models will improve the accuracy of the model based control design for integrated diesel particulate filter-SCR aftertreatment systems.
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e-mail: maruthi.devarakonda@pnl.gov
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September 2011
Research Papers
Modeling Species Inhibition of NO Oxidation in Urea-SCR Catalysts for Diesel Engine Control
Maruthi Devarakonda,
Maruthi Devarakonda
Institute for Interfacial Catalysis,
e-mail: maruthi.devarakonda@pnl.gov
Pacific Northwest National Laboratory
, 902 Battelle Boulevard, P.O. Box 999, Richland, WA 99352
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Russell Tonkyn,
Russell Tonkyn
Institute for Interfacial Catalysis,
Pacific Northwest National Laboratory
, 902 Battelle Boulevard, P.O. Box 999, Richland, WA 99352
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Diana Tran,
Diana Tran
Institute for Interfacial Catalysis,
Pacific Northwest National Laboratory
, 902 Battelle Boulevard, P.O. Box 999, Richland, WA 99352
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Jong Lee,
Jong Lee
Institute for Interfacial Catalysis,
Pacific Northwest National Laboratory
, 902 Battelle Boulevard, P.O. Box 999, Richland, WA 99352
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Darrell Herling
Darrell Herling
Institute for Interfacial Catalysis,
Pacific Northwest National Laboratory
, 902 Battelle Boulevard, P.O. Box 999, Richland, WA 99352
Search for other works by this author on:
Maruthi Devarakonda
Institute for Interfacial Catalysis,
Pacific Northwest National Laboratory
, 902 Battelle Boulevard, P.O. Box 999, Richland, WA 99352e-mail: maruthi.devarakonda@pnl.gov
Russell Tonkyn
Institute for Interfacial Catalysis,
Pacific Northwest National Laboratory
, 902 Battelle Boulevard, P.O. Box 999, Richland, WA 99352
Diana Tran
Institute for Interfacial Catalysis,
Pacific Northwest National Laboratory
, 902 Battelle Boulevard, P.O. Box 999, Richland, WA 99352
Jong Lee
Institute for Interfacial Catalysis,
Pacific Northwest National Laboratory
, 902 Battelle Boulevard, P.O. Box 999, Richland, WA 99352
Darrell Herling
Institute for Interfacial Catalysis,
Pacific Northwest National Laboratory
, 902 Battelle Boulevard, P.O. Box 999, Richland, WA 99352J. Eng. Gas Turbines Power. Sep 2011, 133(9): 092805 (6 pages)
Published Online: April 20, 2011
Article history
Received:
September 25, 2010
Revised:
September 27, 2010
Online:
April 20, 2011
Published:
April 20, 2011
Citation
Devarakonda, M., Tonkyn, R., Tran, D., Lee, J., and Herling, D. (April 20, 2011). "Modeling Species Inhibition of NO Oxidation in Urea-SCR Catalysts for Diesel Engine Control." ASME. J. Eng. Gas Turbines Power. September 2011; 133(9): 092805. https://doi.org/10.1115/1.4002894
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