Unique silver/alumina catalysts developed in collaboration with BASF Corporation were investigated at General Motors under simulated lean-burn engine exhaust feed conditions for the selective catalytic reduction of NOx using hydrocarbons as reductant (HC-SCR). Catalysts were evaluated using a laboratory fixed-bed flow reactor system over a wide range of temperatures relevant to light-duty and heavy-duty exhaust conditions for CIDI (compression ignition direct injection – diesel) and SIDI (spark ignition direct injection – gasoline) applications. This report investigates the effects of silver content (i.e., wt.% Ag2O) and reductant composition (i.e., simulated diesel fuel, simulated gasoline, ethanol, and ethanol/simulated gasoline mixtures) on the steady-state NOx reduction activity. A dual catalyst approach using a HC-SCR catalyst followed by an NH3-SCR catalyst was also investigated. Stochastic Process Modeling was used to determine the optimum in-exhaust injection strategy using ethanol and simulated gasoline as reductants during the New European Driving Cycle.
Catalysts for Lean-Burn Engine Exhaust Aftertreatment Using Hydrocarbon Selective Catalytic Reduction
Sae Int. J. Fuels Lubr
Sae International Journal of Fuels and Lubricants
SAE 2009 Powertrains Fuels and Lubricants Meeting ; 2009
Sae International Journal of Fuels and Lubricants ; 2 , 2 ; 323-336
2009-11-02
14 pages
Conference paper
English
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