Diesel oxidation catalyst and use thereof in diesel and advanced combustion diesel engine systems
AssigneeBASF SE
InventorsJeffrey B. Hoke, Joseph C. Dettling
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Abstract
An oxidation catalyst composite, methods and systems for the treatment of exhaust gas emissions from an advanced combustion engine, such as the oxidation of unburned hydrocarbons (HC), and carbon monoxide (CO) and the reduction of nitrogen oxides (NOx) from a diesel engine and an advanced combustion diesel engine are disclosed. More particularly, washcoat compositions are disclosed comprising at least two washcoat layers, a first washcoat comprising a palladium component and a first support containing cerium and a second washcoat containing platinum and one or more molecular sieves.
Claims21
An oxidation catalyst composite for abatement of exhaust gas emissions from an engine comprising:
- a carrier substrate having a length, an inlet end and an outlet end, a diesel oxidation catalyst catalytic material on the carrier, the diesel oxidation catalyst catalytic material including a first washcoat layer and a second washcoat layer,
- the first washcoat layer comprising a palladium (Pd) component supported by a first refractory metal oxide support including cerium, the first washcoat layer being substantially free of a molecular sieve and being substantially free of barium and lanthanum and platinum;
- and
- the second washcoat layer comprising a second refractory oxide support, a platinum component and a molecular sieve, the second washcoat layer being substantially free of barium and lanthanum.
The oxidation catalyst composite of claim l, further comprising an undercoat layer containing substantially no precious group metal component.
An oxidation catalyst composite for abatement of exhaust gas emissions from an engine comprising:
- a carrier substrate having a length, an inlet end and an outlet end, a diesel oxidation catalyst catalytic material on the carrier, the diesel oxidation catalyst catalytic material including a first washcoat layer and a second washcoat layer,
- the first washcoat layer comprising a palladium (Pd) component supported by a first refractory metal oxide support including cerium, the first washcoat layer being substantially free of a molecular sieve and being substantially free of platinum;
- and
- the second washcoat layer comprising a second refractory oxide support, a platinum component and a molecular sieve.
Dependencies are inferred from the claim text.