This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Assessing Reductant Chemistry During In-Cylinder Regeneration of Diesel Lean NOx Traps
Technical Paper
2004-01-3023
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Lean NOx Trap (LNT) catalysts are capable of reducing NOx in lean exhaust from diesel engines. NOx is stored on the catalyst during lean operation; then, under rich exhaust conditions, the NOx is released from and reduced by the catalyst. The process of NOx release and reduction is called regeneration. One method of obtaining the rich conditions for regeneration is to inject additional fuel into the engine cylinders while throttling the engine intake air flow to effectively run the engine at rich air:fuel ratios; this method is called “in-cylinder” regeneration. In-cylinder regeneration of LNT catalysts has been demonstrated and is a candidate emission control technique for commercialization of light-duty diesel vehicles to meet future emission regulations. In the study presented here, a 1.7-liter diesel engine with a LNT catalyst system was used to evaluate in-cylinder regeneration techniques. Characterization of the exhaust reductant chemistry during in-cylinder regeneration was performed. The effects of various injection strategies and fuels and the resulting exhaust chemistry on the performance of the LNT catalyst were analyzed. In addition, exhaust species measurement of NOx and select reductants were performed inside of the catalyst cells with a capillary-based mass spectrometry technique. The effect of various injection parameters on exhaust chemistry species and LNT performance are discussed. Results indicate that fuel chemistry does affect engine-out hydrocarbon (HC) species, but not engine-out carbon monoxide (CO) or hydrogen (H2) generation. Higher engine-out CO and H2 correlate to improved NOx reduction, irrespective of HCs.
Recommended Content
Authors
- Brian West - Oak Ridge National Laboratory
- Shean Huff - Oak Ridge National Laboratory
- James Parks - Oak Ridge National Laboratory
- Sam Lewis - Oak Ridge National Laboratory
- Jae-Soon Choi - Oak Ridge National Laboratory
- William Partridge - Oak Ridge National Laboratory
- John Storey - Oak Ridge National Laboratory
Topic
Citation
West, B., Huff, S., Parks, J., Lewis, S. et al., "Assessing Reductant Chemistry During In-Cylinder Regeneration of Diesel Lean NOx Traps," SAE Technical Paper 2004-01-3023, 2004, https://doi.org/10.4271/2004-01-3023.Also In
Emissions Measurement and Testing, Advanced Catalysts and Substrates, and Diesel Gaseous Emissions
Number: SP-1899; Published: 2004-10-25
Number: SP-1899; Published: 2004-10-25
References
- Parks Jim Watson Aaron Campbell Greg Epling Bill “Durability of NOx Absorbers: Effects of Repetitive Sulfur Loading and Desulfation” Society of Automotive Engineers Technical Series 2002-01-2880 2002
- Stang John H. Koeberlein David E. Ruth Michael J. “Cummins Light Truck Diesel Engine Progress Report” Society of Automotive Engineers Technical Series 2001-01-2065 2001
- Takahashi Yoshinori Takeda Yoshinaka Kondo Nobuhiro Murata Minehiro “Development of NOx Trap System for Commercial Vehicle - NOx Regeneration by Diesel Fuel and Phenomenon of Sulfur Poisoning and Regeneration” Society of Automotive Engineers Technical Series 2004-01-0580 2004
- Webb Cynthia C. Weber Phillip A. Thornton Matthew “Achieving Tier 2 Bin 5 Emission Levels with a Medium Duty Diesel Pick-Up and a NOx Adsorber, Diesel Particulate Filter Emissions System-NOx Adsorber Management,” Society of Automotive Engineers Technical Series 2004-01-0585 2004
- Blakeman Philip G. Andersen Paul J. Chen Hai-Ying Jonsson J. David Phillips Paul R. Twigg Martyn V. “Performance of NOx Adsorber Emissions Control Systems for Diesel Engines” Society of Automotive Engineers Technical Series 2003-01-0045 2003
- Sluder C. Scott West Brian H. “Effects of Regeneration Conditions on NOx Adsorber Performance” Society of Automotive Engineers Technical Series 2002-01-2876 2002
- Poulston Stephen Rajaram Raj R. “Regeneration of NOx Trap Catalysts,” Catalysis Today 81 2003 603 610
- Kong Yougen Crane Sam Patel Palak Taylor Bill “NOx Trap Regeneration with an On-Board Hydrogen Generation Device” Society of Automotive Engineers Technical Series 2004-01-0582 2004
- Tomazic Dean Tatur Marek M. Thornton Matthew J. “Development of a Diesel Passenger Car Meeting Tier 2 Emissions Legislation” Society of Automotive Engineers Technical Series 2004-01-0581 2004
- Nakatani Koichiro Hirota Shinya Takeshima Shinichi Itoh Kazuhiro Tanaka Toshiaki “Simultaneous PM and NOx Reduction System for Diesel Engines” Society of Automotive Engineers Technical Series 2002-01-0957 2002
- Whitacre Shawn D. Adelman Brad J. May Mike McManus Joseph G. “Systems Approach to Meeting EPA 2010 Heavy-Duty Emission Standards Using a NOx Adsorber Catalyst and Diesel Particle Filter on a 15L Engine” Society of Automotive Engineers Technical Series 2004-01-0587 2004
- Partridge, W.P. Storey, J.M.E. Lewis, S.A. Smithwick, R.W. DeVault, G.L. Cunningham, M.J. Currier, N.W. Yonushonis, T.M. 2000 “Time Resolved Measurements of Emission Transients By Mass Spectrometry,” SAE Transactions - Journal of Fuels & Lubricants 109 2992 paper no. 2000-01-2952
- Hoard John W. Panov Alexander “Products and Intermediates in Plasma-Catalyst Treatment of Simulated Diesel Exhaust,” Society of Automotive Engineers Technical Series 2001-01-3512 2001
- Schmieg Steven J. Cho Byong K. Oh Se H. “Hydrocarbon Reactivity in a Plasma-Catalyst System: Thermal Versus Plasma-Assisted Lean NOx Reduction,” Society of Automotive Engineers Technical Series 2001-01-3565 2001
- Cheng Yisen Cavataio John V. Belanger William D. Hoard John W. Hammerle Robert H. “Factors Affecting Diesel LNT Durability in Lab Reactor Studies,” Society of Automotive Engineers Technical Series 2004-01-0156 2004
- Diesel Emission Control - Sulfur Effects (DECSE) Program: NOx Adsorber Catalysts; Phase II Summary Report U.S. Department of Energy, Office of Transportation Technologies, U.S. Government Printing Office Washington, DC October 2000
- McGill Ralph Khair Magdi K. Sharp Christopher A. “Demonstration of Potential for Selective Catalytic Reduction and Diesel Particulate Filters,” Proceedings of the 9th Diesel Engine Emissions Reduction Conference 2003 DOE Office of Scientific and Technical Information