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Lean Gasoline Engine Reductant Chemistry During Lean NOx Trap Regeneration
- James E. Parks - Oak Ridge National Laboratory ,
- Vitaly Prikhodko - Oak Ridge National Laboratory ,
- William Partridge - Oak Ridge National Laboratory ,
- Jae-Soon Choi - Oak Ridge National Laboratory ,
- Kevin Norman - Oak Ridge National Laboratory ,
- Shean Huff - Oak Ridge National Laboratory ,
- Paul Chambon - Oak Ridge National Laboratory
ISSN: 1946-3952, e-ISSN: 1946-3960
Published October 25, 2010 by SAE International in United States
Citation: Parks, J., Prikhodko, V., Partridge, W., Choi, J. et al., "Lean Gasoline Engine Reductant Chemistry During Lean NOx Trap Regeneration," SAE Int. J. Fuels Lubr. 3(2):956-962, 2010, https://doi.org/10.4271/2010-01-2267.
Lean NOx Trap (LNT) catalysts can effectively reduce NOx from lean engine exhaust. Significant research for LNTs in diesel engine applications has been performed and has led to commercialization of the technology. For lean gasoline engine applications, advanced direct injection engines have led to a renewed interest in the potential for lean gasoline vehicles and, thereby, a renewed demand for lean NOx control. To understand the gasoline-based reductant chemistry during regeneration, a BMW lean gasoline vehicle has been studied on a chassis dynamometer. Exhaust samples were collected and analyzed for key reductant species such as H₂, CO, NH₃, and hydrocarbons during transient drive cycles. The relation of the reductant species to LNT performance will be discussed. Furthermore, the challenges of NOx storage in the lean gasoline application are reviewed.