Modeling and Performance Analysis of a Field-Aged Fe-Zeolite Catalyst in a Heavy Duty Diesel Engine Application

Paper #:
  • 2016-01-9109

Published:
  • 2016-05-18
DOI:
  • 10.4271/2016-01-9109
Citation:
Moores, R., Cernansky, N., Birky, G., and Suder, T., "Modeling and Performance Analysis of a Field-Aged Fe-Zeolite Catalyst in a Heavy Duty Diesel Engine Application," SAE Int. J. Passeng. Cars - Mech. Syst. 9(2):952-959, 2016, doi:10.4271/2016-01-9109.
Pages:
8
Abstract:
In this study a 1-dimensional computational model of a Fe-Zeolite catalyst, implementing conservation of mass, species and energy for both gas and catalyst surface phases has been developed to simulate emissions conversion performance. It is applied to both a fresh catalyst and one that has been aged through exposure to the exhaust system of a Heavy Duty Diesel engine performing in the field for 376K miles. Details of the chemical kinetics associated with the various NOx reduction reactions in the two Fe-Zeolite configurations have been examined and correlated with data from a synthetic gas rig test bench. It was found that the Standard reaction, (4NH3 + 4NO + O2 → 2N2 + 6H2O), which is one of the main reactions for NOx reduction, degraded significantly at the lower temperatures for the aged system. Meanwhile the Fast reaction, (4NH3 + 2NO + 2NO2 → 4N2+ 6H2O), was the least affected and as such became the dominant mechanism for obtaining compliant NOx reduction levels towards the end of the product’s rated life.
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