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Identifying Limiters to Low Temperature Catalyst Activity
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2015 by SAE International in United States
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The drive to more fuel efficient vehicles is underway, with passenger car targets of 54.5 mpg fleet average by 2025. Improving engine efficiency means reducing losses such as the heat lost in the exhaust gases. However, reducing exhaust temperature makes it harder for emissions control catalysts to function because they require elevated temperatures to be active. Addressing this conundrum was the focus of the work performed.
The primary objective of this work was to identify low temperature limiters for a variety of catalyst aftertreatment types. The ultimate goal is to reduce catalyst light-off temperatures, and the knowledge needed is an understanding of what prevents a catalyst from lighting off, why, and how it may be mitigated. Collectively these are referred to here as low temperature limiters to catalyst activity. This paper describes the work performed to identify low temperature limiters to catalyst activity for gasoline Three Way Catalyst (TWC), Diesel Oxidation Catalyst (DOC), Cu-Z Selective Catalytic Reduction (SCR), Fe-Z SCR and V SCR, Lean NOx Trap (LNT), Ammonia Oxidation Catalyst (AMOx) and Natural Gas Oxidation Catalyst (NGOx).
|Technical Paper||Analysis of TWC Characteristics in a Euro6 Gasoline Light Duty Vehicle|
|Technical Paper||SCR Architectures for Low N 2 O Emissions|
|Journal Article||Impact of SCR Integration on N 2 O Emissions in Diesel Application|
CitationBartley, G., "Identifying Limiters to Low Temperature Catalyst Activity," SAE Technical Paper 2015-01-1025, 2015, https://doi.org/10.4271/2015-01-1025.
- Franco , V. , Sanchez , F.P. , German , J. and Mock , P. Real-World Exhaust Emissions From Modern Diesel Cars A Meta-Analysis of PEMS Emissions Data from EU (Euro 6) and US(Tier 2 Bin 5/ULEV II) Diesel Passenger Cars International Council on Clean Transportation www.theicct.org
- Lei , Y. et al. CO+NO Versus CO+O 2 Reaction on Monolayer Fe)(111) Films on Pt(111) Chemcatchem 2011 3 671 674
- Dubien , C. et al. Three-Way Catalytic Converter Modeling: Fast- and Slow-Oxidizing Hydrocarbons, Inhibiting Species, and Steam Reforming Reaction Chemical Engineering Science 53 3 471 481 1998
- Stacchiola , D. , Burkholder L , Tysoe WT Structure And Reactivity of Propylene on Clean and Hydrogen-Covered Pd (111) Surface Science 542 1 129 141 2003
- Votsmeier , M. , Umicore Reversible Activation/Deactivation Effects CLEERS 2014
- Hussain , A. et al. The Beneficial Effect of Hydrogen on CO Oxidation Over Au Catalysts, A Computational Study Molecules 2011 16 9582 9599 1420-3049
- Guliaeff , A. , Wanninger , K. , Klose , F. , Maletz , G. et al. Development of a Sulfur Tolerant PGM Based Zeolite Catalyst for Methane Oxidation and Low Temperature Hydrocarbon Trapping SAE Technical Paper 2013-01-0531 2013 10.4271/2013-01-0531
- Loughran , C. , and Resasco , D. Bifunctionality of Palladium-Based Catalysts Used in the Reduction of Nitric Oxide by Methane in the Presence of Oxygen Applied Catalysis B: Environmental 7 1-2 113 126 7 December 1996
- Huang , Z. et al. Inhibition Effect of H 2 O on V 2 O 5 /AC Catalyst for Catalytic Reduction of NO with NH 3 at Low Temperature Applied Catalysis B: Environmental 63 2006 260 265