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Comparison of Diesel Oxidation Catalyst Performance on an Engine and a Gas Flow Reactor
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2007 by SAE International in United States
Annotation ability available
This paper analyzes and compares reactor and engine behavior of a diesel oxidation catalyst (DOC) in the presence of conventional diesel exhaust and low temperature premixed compression ignition (PCI) diesel exhaust. Surrogate exhaust mixtures of n-undecane (C11H24), ethene (C2H4), CO, O2, H2O, NO and N2 are defined for conventional and PCI combustion and used in the gas flow reactor tests. Both engine and reactor tests use a DOC containing platinum, palladium and a hydrocarbon storage component (zeolite).
On both the engine and reactor, the composition of PCI exhaust increases light-off temperature relative to conventional combustion. However, while nominal conditions are similar, the catalyst behaves differently on the two experimental setups. The engine DOC shows higher initial apparent HC conversion efficiencies because the engine exhaust contains a higher fraction of trappable (i.e., high boiling point) HC. Engine DOC light-off is delayed because in the tests performed, engine-out CO was 11-30% higher than on the reactor, causing significant self-inhibition. The engine DOC also experiences ambient cooling, which further delays light-off. Fully-lit HC conversion is lower on the engine because the reactor surrogate exhaust mixture does not include methane (CH4), which is unreactive at diesel light-off temperatures. Engine DOC heat loss and sample line HC desorption during post-DOC sampling also reduce fully-lit conversion on the engine.
CitationKnafl, A., Han, M., Bohac, S., Assanis, D. et al., "Comparison of Diesel Oxidation Catalyst Performance on an Engine and a Gas Flow Reactor," SAE Technical Paper 2007-01-0231, 2007, https://doi.org/10.4271/2007-01-0231.
- Akihama, L. Takatori, Y. Inagaki, K. Sasaki, S. Dean, A.M. “Mechanism of the Smokeless Rich Diesel Combustion by Reducing Temperature” SAE 2001-01-0655
- Knafl, A. Bohac, S.V. Jacobs, T.J. Assanis, D.N. “The Load Limits of Low-Temperature Premixed Charge Compression Ignition Diesel Combustion” ISCE 2006
- Eastwood, P. “Critical Topics in Exhaust Gas Aftertreatment” Research Studies Press Ltd. 2000
- Adams, K. M. Cavataio, J. V. Sale, T. Rimkus, W.A. Hammerle, R. H. “Laboratory Screening of Diesel Oxidation Catalysts and Validation with Vehicle Testing: The Importance of Hydrocarbon Storage” SAE 962049
- Knafl, A. Busch, S.B. Han, M. Bohac S. V. Assanis, D. N. Szymkowicz, P. G. Blint, R. D. “Characterizing Light-Off Behavior and Species-Resolved Conversion Efficiency during In-Situ Diesel Oxidation Catalyst Degreening SAE 2006-01-0209
- Bohac, S. V. Han, M. Jacobs, T. J. López, A. J. Assanis, D. N. Szymkowicz, P. G. “Speciated Hydrocarbon Emissions from an Automotive Engine and DOC Utilizing Conventional and PCI Combustion” SAE 2006-01-0201
- Jacobs, T. J. Bohac, S. V. Assanis, D. N. Szymkowicz, P. G. “Lean and Rich Premixed Compression Ignition Combustion in a Light-Duty Diesel Engine” SAE 2005-01-0166
- Yao, Y.Y. “The Oxidation of CO and Hydrocarbons over Noble Metal Catalysts” Journal of Catalysis 87 1984 152 162
- Oh, S. H. Mitchell, P. J. “Effects of rhodium addition on methane oxidation behavior of alumina-supported noble metal catalysts” Applied Catalysis B: Environmental 5 1994 165 17926
- Patterson, M. J. Angove, D. E. Cant, N. W. “The effect of carbon monoxide on the oxidation of four C6 to C8 hydrocarbons over platinum, palladium, and rhodium Applied Catalysis B: Environmental 26 2000 47 57
- Amon-Mézière, I. Castagna, F. Prigent, M. Pentenero, A. “Speciated Hydrocarbon Conversion on a Fresh Pd/Rh Three-Way Catalyst” SAE 950932
- Arnby, K. Törncrona, A. Andersson, B. Skoglundh, M. “Investigation of Pt/γ-Al 2 O 3 catalysts with locally high Pt concentrations for oxidation of CO at low temperatures” Journal of Catalysis 221 2004 252 261
- Bunluesin, T. Putna, E.S. Gorte, R.J. “A comparison of CO oxidation on ceria-supported Pt, Pd, and Rh” Catalysis Letters 41 1996 1 5
- Carlsson, P.A. Skoglundh, M. Thormählen, P. Andersson, B. “Low-temperature CO oxidation over a Pt/Al 2 O 3 monolith catalyst investigated by step-response experiments and simulations” Topics in Catalysis 30 31 July 2004
- Knafl, A. “Novel Diesel Oxidation Catalysts in Combination with Low Temperature Premixed Compression Ignition Combustion” University of Michigan 2007