The increasing demands on exhaust gas after treatment systems caused by legislative guidelines imply a systematic combination of several abatement units for diesel applications: diesel oxidation catalyst (DOC), diesel particulate filter (DPF), DeNOx systems (SCR, NSC). The development and optimization of such complex systems requires a simulation-supported approach which is less time and budget consuming than a purely experimental approach. Furthermore, the impact of thermal aging must be considered in the operation strategy. Presently, much effort is required for the adjustment of kinetic parameters to meet conversion behavior of aged catalysts. The effort would be strongly reduced, if the model parameters could be correlated to measurable catalyst characteristics. In series application, one of the main challenges is the limited temperature resistance of NOx storage catalysts (NSC = LNT, lean NOx trap) and diesel oxidation catalysts (DOC). To protect the catalysts from harmful temperature maxima a simulation-supported engine operation strategy is required, which takes the reduced activity of aged catalysts into account. In this contribution, the properties and the conversion behavior of fresh and aged catalysts were characterized and compared. A faster model parameterization is achieved by correlating the model parameters of aged catalysts with characteristic parameters, which can be derived by a reduced set of experiments.
Faster model parameterization for aged diesel oxidation catalysts and lean NOx traps
2013
12 Seiten, 9 Bilder, 1 Tabelle, 8 Quellen
Aufsatz (Konferenz)
Englisch
Faster model parameterization for aged diesel oxidation catalysts and lean NOx traps
Kraftfahrwesen | 2013
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