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Engine Performance of Cu- and Fe-Based SCR Emission Control Systems for Heavy Duty Diesel Applications
Technical Paper
2011-01-1329
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Since early 2010, most new medium- and heavy-duty diesel vehicles in the US rely on urea-based Selective Catalytic Reduction (SCR) technology for meeting the most stringent regulations on nitrogen oxides (NOx) emissions in the world today. Catalyst technologies of choice include Copper (Cu)- and Iron (Fe)-based SCR. In this work, the performances of Fe-SCR and Cu-SCR were investigated in the most commonly used DOC + CSF + SCR system configuration. Cu-SCR offered advantages over Fe-SCR in terms of low temperature conversion, NO₂:NOx ratio tolerance and NH₃ slip, while Fe-SCR demonstrated superior performance under optimized NO₂:NOx ratio and at higher temperatures. The Cu-SCR catalyst displayed less tolerance to sulfur (S) exposure. Reactor testing has shown that Cu-SCR catalysts deactivate at low temperature when poisoned by sulfur. The impact of sulfur on the Cu-SCR system was studied by exposing the catalysts to 350 ppm S fuel and measuring the system performance during engine transient and steady state conditions. Results revealed that, despite the negative impact that sulfur can have on Cu catalysts, practical standard operation modes and current system regeneration strategies sufficed to maintain the high NOx conversion performance required for the system. In this work, the performance of Cu- and Fe-SCR in the DOC + CSF + SCR configuration was also tested on field vehicles. Consistently high NOx conversion was observed during months of field trials on low temperature applications.
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Authors
- Mario Castagnola - Johnson Matthey Inc.
- Jonathan Caserta - Johnson Matthey Inc.
- Sougato Chatterjee - Johnson Matthey Inc.
- Hai-Ying Chen - Johnson Matthey Inc.
- Raymond Conway - Johnson Matthey Inc.
- Joseph Fedeyko - Johnson Matthey Inc.
- Wassim Klink - Johnson Matthey Inc.
- Penelope Markatou - Johnson Matthey Inc.
- Sandip Shah - Johnson Matthey Inc.
- Andrew Walker - Johnson Matthey Inc.
Topic
Citation
Castagnola, M., Caserta, J., Chatterjee, S., Chen, H. et al., "Engine Performance of Cu- and Fe-Based SCR Emission Control Systems for Heavy Duty Diesel Applications," SAE Technical Paper 2011-01-1329, 2011, https://doi.org/10.4271/2011-01-1329.Also In
References
- 2007 Heavy-Duty Highway Rule, 40 CFR 69, 80, and 86 2001
- Fedeyko, Joseph Chen, B. Haiying, Chen “Mechanistic study of the low temperature activity of transition metal exchanged zeolite SCR catalysts” Catal. Today 151 2010 231 236 10.1016/j.cattod.2009.12.015
- Kamasamudram, K. Yezerets, A. Chen, X. Currier, N. et al. “New Insights into Reaction Mechanism of Selective Catalytic Ammonia Oxidation Technology for Diesel Aftertreatment Applications,” SAE Technical Paper 2011-01-1314 2011 10.4271/2011-01-1314
- Colombo, Massimo Nova, Isabella Tronconi, Enrico “A comparative study of the NH 3 -SCR reactions over a Cu-zeolite and a Fe-zeolite catalyst” Catal. Today 151 2010 223 230 10.1016/j.cattod.2010.01.010
- Cheng, Yisun Lambert, Christine Kim, Do Heui Kwak, Ja Hun Cho, Sung June Peden, Charles “The different impacts of SO 2 and SO 3 on Cu/zeolite SCR catalysts” Catal. Today 151 2010 266 270 10.1016/j.cattod.2010.01.013
- Pârvulescu, V.I. Grange, P. Delmon, B. “Catalytic removal of NO” Catal. Today 46 1998 233 316