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Lean NOx Trap for Heavy-Duty On-Road Applications - A Feasible Alternative?
Technical Paper
2007-01-4179
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The implementation and development efforts of lean NOx trap catalysts for heavy-duty applications decreased a number of years ago. Most heavy-duty engine manufacturers realized that the system complexity as well as the durability of such a system does not allow large volume production without significant risk. The current consensus of the heavy-duty community is that for 2010 the SCR system will be the prime path to meet the 0.2 g/bHPhr NOx emission standard, although this is subject to adequate infrastructure investment and progress.
As a low volume manufacturer, in order to comply with the 2007 heavy-duty phase-in emission standards, General Engine Products (a subsidiary of AM General LLC) integrated a NOx adsorber system on the Optimizer 6500 engine. This engine features split combustion chamber design, rotary fuel injection pump and operates with EGR. The engine meets the 2004 heavy-duty emission standards, but does not allow a NOx reduction through engine internal measures that would allow certification to 2007 emission standards. This fact forced the introduction of an exhaust aftertreatment system with NOx conversion efficiencies in the 60% range. The developmental results were presented in greater detail in paper 2007-01-0235.
The paper discusses the details of the catalyst system development, the oxygen storage management of the different components and the associated hydrocarbon breakthrough during DNT regenerations as well as the durability results of the DF testing.
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Citation
Tatur, M., Koehler, E., Laermann, M., Tomazic, D. et al., "Lean NOx Trap for Heavy-Duty On-Road Applications - A Feasible Alternative?," SAE Technical Paper 2007-01-4179, 2007, https://doi.org/10.4271/2007-01-4179.Also In
References
- Tatur et. al Development of an Emission Controls Concept for an IDI Heavy-Duty Diesel Engine meeting 2007 Phase-in Emission Standards' SAE Paper 2007-01-0235
- 40CFR §86.1333-90 Transient test cycle generation
- Dieselnet www.dieselnet.com
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- Tomazic D. Tatur M. Thornton M “APBF-DEC NO x Adsorber/DPF Project: Light-Duty Passenger Car Platform,” DEER Paper August 2003 Newport, Rhode Island
- Geckler S. Tomazic D. et al. “Development of a Desulfurization Strategy for a NO x Adsorber Catalyst System,” SAE Paper 2001-01-0510 March 2001 Detroit, Michigan
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- Whitacre, S. et al. “Systems Approach to Meeting EPA 2010 Heavy-Duty Emission Standards Using a NO x Adsorber Catalyst and Diesel Particle Filter on a 15l Engine” SAE Paper 2004-01-0587
- Tatur M. Tyrer H. Tomazic D. Thornton M. McDonald, J. “Tier 2 Intermediate Useful Life (50,000 miles) and 4000 Mile Supplemental Federal Test Procedure (SFTP) Exhaust Emission Results for a NO x Adsorber and Diesel Particle Filter Equipped Light-Duty Diesel Vehicle,” SAE Paper 2005-01-1755
- Thornton M. Tatur M. Tyrer H. Tomazic D “Full Useful Life (120,000 miles) Exhaust Emission Performance of a NO x Adsorber and Diesel Particle Filter Equipped Passenger Car and Medium-Duty Engine in Conjunction with Ultra Low Sulfur Fuel,” DEER 2005