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SCR Deactivation Kinetics for Model-Based Control and Accelerated Aging Applications
Technical Paper
2012-01-1077
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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Citation
Bartley, 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.Also In
References
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