This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Effects of NO X Storage Component on Ammonia Formation in TWC for Passive SCR NO X Control in Lean Gasoline Engines
Technical Paper
2018-01-0946
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
A prototype three-way catalyst (TWC) with NOX storage component was evaluated for ammonia (NH3) generation on a 2.0-liter BMW lean burn gasoline direct injection engine as a component in a passive ammonia selective catalytic reduction (SCR) system. The passive NH3 SCR system is a potential approach for controlling nitrogen oxides (NOX) emissions from lean burn gasoline engines. In this system, NH3 is generated over a close-coupled TWC during periodic slightly-rich engine operation and subsequently stored on an underfloor SCR catalyst. Upon switching to lean, NOX passes through the TWC and is reduced by the stored NH3 on the SCR catalyst. Adding a NOX storage component to a TWC provides two benefits in the context of a passive SCR system: (1) enabling longer lean operation by storing NOX upstream and preserving NH3 inventory on the downstream SCR catalyst; and (2) increasing the quantity and rate of NH3 production during rich operation. Since the fuel penalty associated with passive SCR NOX control depends on the fraction of time that the engine is running rich rather than lean, both benefits (longer lean times and shorter rich times achieved via improved NH3 production) will decrease the passive SCR fuel penalty. However, these benefits are primarily realized at low to moderate temperatures (300-500 °C), where the NOX storage component is able to store NOX, with little to no benefit at higher temperatures (>500 °C), where NOX storage is no longer effective. This study discusses engine parameters and control strategies affecting the NH3 generation over a TWC with NOX storage component.1
Recommended Content
Authors
Citation
Prikhodko, V., Pihl, J., Toops, T., and Parks, J., "Effects of NOX Storage Component on Ammonia Formation in TWC for Passive SCR NOX Control in Lean Gasoline Engines," SAE Technical Paper 2018-01-0946, 2018, https://doi.org/10.4271/2018-01-0946.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Unnamed Dataset 2 | ||
Unnamed Dataset 3 | ||
Unnamed Dataset 4 | ||
Unnamed Dataset 5 |
Also In
References
- Davis , S.C. , Williams , S.E. , and Boundy , R.G. Transportation Energy Data Book: Edition 35 2016
- Parks , J.E. , 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 10.4271/2010-01-2267
- Chambon , P. , Huff , S. , Norman , K. , Edwards , K.D. et al. European Lean Gasoline Direct Injection Vehicle Benchmark SAE Technical Paper 2011-01-1218 2011 10.4271/2011-01-1218
- Kim , C.H. , Perry , K. , Viola , M. , Li , W. , and Narayanaswamy , K. Three-Way Catalyst Design for Urealess Passive Ammonia SCR: Lean-Burn SIDI Aftertreatment System SAE Technical Paper 2011-01-0306 2011 10.4271/2011-01-0306
- Li , W. , Perry , K.L. , Narayanaswamy , K. , Kim , C.H. et al. Passive Ammonia SCR System for Lean-Burn SIDI Engines SAE Int. J. Fuels Lubr. 3 1 99 106 2010 10.4271/2010-01-0366
- Prikhodko , V.Y. Parks , J.E. , Pihl , J.A. , Toops , T.J. , and Passive SCR for Lean Gasoline NO X Control: Engine-Based Strategies to Minimize Fuel Penalty Associated with Catalytic NH 3 Generation Catal. Today 267 202 209 2016
- Prikhodko , V.Y. , Parks , J.E. , Pihl , J.A. , and Toops , T.J. Ammonia Generation over TWC for Passive SCR NO X Control for Lean Gasoline Engines SAE Int. J. Engines 7 3 1235 1243 2014 10.4271/2014-01-1505
- Schwarz , C. , Schünemann , E. , Durst , B. , Fischer , J. , and Witt , A. Potentials of the Spray-Guided BMW DI Combustion System SAE Technical Paper 2006-01-1265 2006 10.4271/2006-01-1265
- Prikhodko , V.Y. , Parks , J.E. , Pihl , J.A. , and Toops , T.J. Ammonia Generation over TWC for Passive SCR NO X Control for Lean Gasoline Engines SAE Int. J. Engines 7 3 1235 1243 2014 10.4271/2014-01-1505
- Partridge , W.P. , Storey , J.M.E. , Lewis , S.A. , Smithwick , R.W. et al. Time-Resolved Measurements of Emission Transients By Mass Spectrometry SAE Technical Paper 2000-01-2952 2000 10.4271/2000-01-2952
- D’Errico , G. , Ferrari , G. , Onorati , A. , and Cerri , T. Modeling the Pollutant Emissions from a S.I. Engine SAE Technical Paper 2002-01-0006 2002 10.4271/2002-01-0006
- Li , L. , Li , G. , and Qiu , D. A Study of Crevice HC Mechanism Based on the Transient HC Test Data and the Double Zone Combustion Model SAE Technical Paper 2008-01-1652 2008 10.4271/2008-01-1652
- Pihl , J.A. , Prikhodko , V.Y. , Toops , T.J. , and Parks , J.E. TWC Formulation Effects on NH 3 Generation for Passive SCR Applications in Lean Gasoline Engine Exhaust Acknowledgments 24th North American Meeting of the Catalysis Society 2015
- Adams , E.C. , Skoglundh , M. , Gabrielsson , P. , Laurell , M. et al. Ammonia Formation over Pd/Al 2 O 3 Modified with Cerium and Barium Catal. Today 267 x 210 216 2016
- Theis , J.R. , Kim , J. , and Cavataio , G. Passive TWC+SCR Systems for Satisfying Tier 2, Bin 2 Emission Standards on Lean-Burn Gasoline Engines SAE Int. J. Fuels Lubr. 8 2 460 473 2015 10.4271/2015-01-1004
- Choi , J.-S. , Partridge , W.P. , Pihl , J.A. , Kim , M.-Y. et al. Spatiotemporal Distribution of NOx Storage and Impact on NH 3 and N 2 O Selectivities during Lean/Rich Cycling of a Ba-Based Lean NOx Trap Catalyst Catal. Today 184 1 20 26 2012
- Bártová , Š. , Kočí , P. , Mráček , D. , Marek , M. et al. New Insights on N 2 O Formation Pathways during Lean/Rich Cycling of a Commercial Lean NOx Trap Catalyst Catal. Today 231 3 145 154 2014
- Graham , L.A. , Belisle , S.L. , and Rieger , P. Nitrous Oxide Emissions from Light Duty Vehicles Atmos. Environ. 43 12 2031 2044 2009