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Modeling Study of Urea SCR Catalyst Aging Characteristics
Technical Paper
2007-01-1580
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper presents a study of urea SCR catalyst aging characteristics and implementation into an analytical model that complements laboratory based experiments for a dynamometer-aged SCR brick. The model calibration is based on measured data taken from a 120k-mile simulated dynamometer-aged base metal/zeolite SCR. Dynamometer aging led to non-uniform axial deterioration with more severe deactivation toward the front of the SCR brick compared to the rear. Data from a 120k-mile simulated hydrothermally oven-aged SCR (uniform axial aging) is used to establish baseline aged NOx performance and NH3 adsorption/desorption behavior. An axial deterioration factor is applied to the baseline model to account for differences between oven and dynamometer aging. The model is exercised using engine out vehicle data to examine how different aging processes (oven vs. dynamometer) affect overall NOx performance during the EPA FTP (Environmental Protection Agency Federal Test Procedure).
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Citation
Kim, J., Cheng, Y., Patterson, J., Laing, P. et al., "Modeling Study of Urea SCR Catalyst Aging Characteristics," SAE Technical Paper 2007-01-1580, 2007, https://doi.org/10.4271/2007-01-1580.Also In
References
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