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Sustained Low Temperature NOx Reduction
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 03, 2018 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Sustained NOx reduction at low temperatures, especially in the 150-200 °C range, shares some similarities with the more commonly discussed cold-start challenge, however, poses a number of additional and distinct technical problems. In this project, we set a bold target of achieving and maintaining 90% NOx conversion at the SCR catalyst inlet temperature of 150 °C. This project is intended to push the boundaries of the existing technologies, while staying within the realm of realistic future practical implementation.
In order to meet the resulting challenges at the levels of catalyst fundamentals, system components, and system integration, Cummins has partnered with the DOE, Johnson Matthey, and Pacific Northwest National Lab and initiated the Sustained Low-Temperature NOx Reduction program at the beginning of 2015 and completed in 2017. Through this collaboration, we are exploring catalyst formulations and catalyst architectures with enhanced catalytic activity at 150 °C; opportunities to approach the desirable ratio of NO and NO2 in the SCR feed gas; options for robust low-temperature reductant delivery; and the requirements for the overall system integration. This paper will provide information on the approach used and share results of an on-engine performance demonstration on the path towards a commercially viable solution.
- Yuhui Zha - Cummins Inc.
- Michael Cunningham - Cummins Inc.
- Yadan Tang - Cummins Inc.
- Anand Srinivasan - Cummins Inc.
- Jinyong Luo - Cummins Inc.
- John Heichelbech - Cummins Inc.
- Venkata Lakkireddy - Cummins Inc.
- Aleksey Yezerets - Cummins Inc.
- Sade Ruffin - Cummins Emission Solutions
- Zhehao Wei - Johnson Matthey Inc.
- Joseph Fedeyko - Johnson Matthey Inc.
- Balaji Sukumar - Johnson Matthey Inc.
- Howard Hess - Johnson Matthey Inc.
- Feng Gao - Pacific Northwest National Laboratory
- Janos Szanyi - Pacific Northwest National Laboratory
- Yong wang - Pacific Northwest National Laboratory
CitationZha, Y., Cunningham, M., Tang, Y., Srinivasan, A. et al., "Sustained Low Temperature NOx Reduction," SAE Technical Paper 2018-01-0341, 2018, https://doi.org/10.4271/2018-01-0341.
Data Sets - Support Documents
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- Kamasamudram, K., Kumar, A., Luo, J., Currier, N. et al. , “New Insights into the Unique Operation of Small Pore Cu-Zeolite SCR Catalyst: Overlapping NH3 Desorption and Oxidation Characteristics for Minimizing Undesired Products,” SAE Technical Paper 2014-01-1542 , 2014, doi:10.4271/2014-01-1542.
- Fickel, D.W., D’Addio, E., Lauterbach, J.A., and Lobo, R.F., “The Ammonia Selective Catalytic Reduction Activity of Copper-exchanged Small-Pore Zeolites,” Appl. Catal. B-Environ. 102(3-4):441-448, 2011, doi:10.1016/j.apcatb.2010.12.022.
- Kwak, J.H., Tonkyn, R.G., Kim, D.H., Szanyi, J., and Peden, C.H.F., “Excellent Activity and Selectivity of Cu-SSZ-13 in the Selective Catalytic Reduction of NOx with NH3,” Journal of Catalysis 275(2):187-190, 2010, doi:10.1016/j.jcat.2010.07.031.
- Luo, J., Tang, Y., Joshi, S., Kamasamudram, K. et al. , “The Impact of Ammonium Nitrate Species on Low Temperature NOx Conversion over Cu/CHA SCR Catalyst,” SAE Int. J. Engines 10(4), 2017, doi:10.4271/2017-01-0953.
- Colombo, M., Nova, I., and Tronconi, E., “Detailed Kinetic Modeling of the NH3-NO/NO2 SCR Reactions over a Commercial Cu-Zeolite Catalyst for Diesel Exhausts after Treatment,” Catal. Today 197:243-255, 2012.
- Chigada, P., Watling, T., Cleeton, J., Gall, M. et al. , “Experimental and Modelling Study of Cold Start Effects on a Cu-Zeolite NH3 Selective Catalytic Reduction Catalyst,” SAE Technical Paper 2015-01-2011 , 2015, doi:10.4271/2015-01-2011.
- Koebel, M., Madia, G., and Elsener, M., “Selective Catalytic Reduction of NO and NO2 at Low Temperatures,” Catal. Today 73:239-247, 2002.
- Grossale, A., Nova, I., Tronconi, E. et al. , “The Chemistry of the NO/NO2-NH3 “Fast” SCR Reaction over Fe-ZSM5 Investigated by Transient Reaction Analysis,” J. Catal. 256:312-322, 2008.