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Feasibility Investigation of a High-Efficiency NOx Aftertreatment System for Diesel Engines
Technical Paper
2007-01-3983
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A high-efficiency NOx aftertreatment system has been proposed for use in Diesel engines. This system includes a Lean NOx Trap (LNT) in series with a Selective Catalyst Reduction (SCR) catalyst [6], [7], [8], and is hereinafter referred to as the LNT-SCR system. The combined LNT-SCR system can potentially overcome many of the drawbacks of LNT-only and SCR-only operation and achieve very high NOx conversion efficiency without external addition of ammonia (or urea). A laboratory test procedure was developed to validate the LNT-SCR system concept, and a series of tests was conducted to test the NOx conversion of this system under various conditions. A Synthetic Gas Reactor (SGR) system was modified to accommodate LNT and SCR catalyst cores and synthetic gas mixtures were used to simulate rich-lean regeneration cycles from a diesel engine. A Fourier Transform Infrared (FTIR) system was used to measure gas compositions within the LNT-SCR system.
Results from these preliminary tests validated the LNT-SCR concept operation and demonstrated that the LNT-SCR system can achieve higher NOx conversion efficiency than the LNT-only system at low temperatures (350°C and lower). However, at high exhaust temperatures (400°C and higher) the NOx conversion efficiency of the LNT-SCR system was lower than that of the LNT-only system. A considerable amount of work is still required to formulate a high-efficiency NOx aftertreatment system suitable for production vehicle applications, but these results indicate that the LNT-SCR concept works and merits further consideration.
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Citation
Roecker, R., Zhan, R., and Stanglmaier†, R., "Feasibility Investigation of a High-Efficiency NOx Aftertreatment System for Diesel Engines," SAE Technical Paper 2007-01-3983, 2007, https://doi.org/10.4271/2007-01-3983.Also In
References
- Blakeman P. G. Andersen P. J. Chen H-Y Jonsson D. J. Phillips P. R. Twigg M. V. Performance of NOx adsorber emissions control systems for diesel engines SAE Paper No. 2003-01-0045 SAE World Congress & Exhibition March 2003
- Fritzs Nicole Mathes Wieland Mueller Raimund Zuerbig Juergen On-road demonstration of NOx emission control for diesel trucks with SiNOx urea SCR system SAE Paper No. 1999-01-0111 SAE World Congress & Exhibition March 1999
- Hackenberg Stefan Ranalli Marco Ammonia on a LNT: Avoid the formation or take advantage of it SAE Paper No. 2007-01-1239 SAE World Congress & Exhibition April 2007
- Lambert C. Hammerle R. McGill R. Khair M. Sharp C. Technical advantages of urea SCR for light-duty and heavy-duty diesel vehicle applications SAE Paper No. 2004-01-1292 SAE World Congress & Exhibition March 2004
- Schenk C. McDonald J. Olson B. High-efficiency NOx and PM exhaust emission control for heavy-dugy on-highway diesel engines SAE Paper No. 2001-01-13 SAE World Congress & Exhibition March 2001
- Snow Rachel Cavataio Giovanni Dobson Douglas Montreuil Cliff Hammerle Robert H. Calibration of a LNT-SCR diesel aftertreatment system SAE Paper No. 2007-01-1244 SAE World Congress & Exhibition April 2007
- Stanglmaier Rudolf H. Roecker Ryan C. Roberts Charles E. Jr. Stewart Daniel W. NOx Aftertreatment System and Method for Internal Combustion Engines May 2004
- Theis Joseph R. Gulari Erdogan A LNT+SCR system for treating the NOx emissions from a diesel engine SAE Paper No. 2006-01-0210 SAE 2006 World Congress & Exhibition April 2006
- van Genderen Marcel van Gompel Peter Engine dynamometer and vehicle performance of urea scr-system for heavy-duty truck engines International Symposium on I.C. Engine Shanghai, China November 2004
- Whitacre S. D. Adelman B. J. May M. P. McManus J. G. Systems approach to meeting EPA 2010 heavy-duty emissions standards using a NOx adsorber catalyst and diesel particle filter on a 15 l engine SAE Paper No. 2004-01-1587 SAE World Congress & Exhibition March 2004