This content is not included in your SAE MOBILUS subscription, or you are not logged in.
SCR Deactivation Kinetics for Model-Based Control and Accelerated Aging Applications
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2012 by SAE International in United States
Annotation ability available
Selective Catalytic Reduction (SCR) catalysts are used to reduce NOx emissions from internal combustion engines in a variety of applications. Southwest Research Institute (SwRI) performed an Internal Research & Development project to study SCR catalyst thermal deactivation. The study included a V/W/TiO₂ formulation, a Cu-zeolite formulation and a Fe-zeolite formulation. This work describes NH₃ storage capacity measurement data as a function of aging time and temperature. Addressing one objective of the work, these data can be used in model-based control algorithms to calculate the current NH₃ storage capacity of an SCR catalyst operating in the field, based on time and temperature history. The model-based control then uses the calculated value for effective DEF control and prevention of excessive NH₃ slip. Addressing a second objective of the work, accelerated thermal aging of SCR catalysts may be achieved by elevating temperatures above normal operating temperatures. Time and temperature correlations use the Arrhenius equation, which requires a formulation-specific deactivation energy value (Ed). The NH₃ storage capacity data generated in this work were used to calculate an Ed value for each of the three SCR catalyst formulations.
CitationBartley, G., Chadwell, C., Kostek, T., and Zhan, R., "SCR Deactivation Kinetics for Model-Based Control and Accelerated Aging Applications," SAE Technical Paper 2012-01-1077, 2012, https://doi.org/10.4271/2012-01-1077.
- Tronconi, E. et al. “Catalytic Mechanism, Detailed Kinetics and Converter Model for NH 3 -SCR of NO x Emissions from vehicles” 10 th CLEERS Workshop 2007
- Theis, J. McCabe, R. FMC “Selective Catalytic Reduction (SCR) with Urea Injection for NOx Control on Lean-Burn Gasoline Engines” 11 th CLEERS Workshop 2008
- Shibata, M. Nagata, H. Takeshima, S. Hoshino, K. “A Study of Engine Oil Composition Effects on Zeolite-type SCR Catalyst Durability,” SAE Technical Paper 2007-01-1924 2007 10.4271/2007-01-1924
- Schaefer, M. Hofmann, L. Girot, P. Rohe, R. “Investigation of NOx- and PM-reduction by a Combination of SCR-catalyst and Diesel Particulate Filter for Heavy-duty Diesel Engine,” SAE Int. J. Fuels Lubr. 2 1 386 398 2009 10.4271/2009-01-0912
- IUPAC Compendium of Chemical Terminology 2nd 1997
- Heck, R. Farrauto, R. “Catalytic Air Pollution Control - Commercial technology” Van Nostrand Reinhold 1995
- Eastwood, P. “Critical Topics in Exhaust gas Aftertreatment” Research Studies Press Ltd. 2000