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Development and Validation of a Cu-Zeolite SCR Catalyst Model Johnson Matthey Technology Centre
- Format:
- Conference/Event
- Author/Creator:
- Watling, Watling, author.
- Conference Name:
- SAE 2011 World Congress & Exhibition (2011-04-12 : Detroit, Michigan, United States)
- Language:
- English
- Physical Description:
- 1 online resource
- Place of Publication:
- Warrendale, PA SAE International 2011
- Summary:
- A one-dimensional numerical model for a Cu-zeolite SCR catalysthas been developed. The model is based on kinetics developed fromlaboratory microreactor data for the various NH₃-NOX reactions,as well as for NH₃ oxidation. The kinetic scheme used is discussedand evidence for it presented. The model is capable of predictingthe conversion of NO and NO₂, NH₃ slip and the formation of N₂O, aswell as effects associated with NH₃ storage and desorption. Toobtain a good prediction of catalyst temperature during cold starttests, it was found necessary to include storage and desorption ofH₂O in the model; storage of H₂O is associated with a sizableexotherm and the subsequent desorption of this water produces acorrespondingly large endotherm. Extensive validation of the modelhas been carried out against engine/vehicle data for both HDD(light-off, heavy-duty FTP transient cycle, NRTC) and LDD (NEDC)test cycles for a range of catalyst volumes, urea injection levelsand upstream DOC volume and loading. In particular, data measuredwith an oversized DOC was used to test the models ability topredict N₂O formation. In general, good agreement between modelprediction and the experimental data was achieved.Examples of application of the model to aftertreatment designare given. The model can be used to predict the effect of changingsystem parameters (such as catalyst size, NH₃:NOX ratio (or ureainjection strategy) and NO₂/NOX ratio) and the effect ofmodifying engine calibration (catalyst inlet temperature,etc.)
- Notes:
- Vendor supplied data
- Publisher Number:
- 2011-01-1299
- Access Restriction:
- Restricted for use by site license
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