Catalytically coated diesel particle filter, process for producing it and its use
AssigneeUmicore AG & Co. KG
InventorsMarkus Koegel, Marcus Pfeifer, Gerald Jeske, Frank Walter Schuetze, Stéphanie Frantz, Thomas Kreuzer
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Abstract
A diesel particulate filter with an oxidation catalyst comprising platinum and palladium deposited thereon is described. Addition of HC storage components to the oxidation catalyst allows the conversion of hydrocarbons and carbon monoxide to be improved significantly.
Claims12
A particulate filter for treating the exhaust gases of diesel engines comprising an entry side and an exit side for the exhaust gases and an axial length, said particulate filter being coated with a first catalyst which comprises platinum group metals as catalytically active components on support materials, characterized in that the support materials for the platinum group metals are selected from the group consisting of aluminum oxide, silicon dioxide, titanium dioxide, zirconium oxide, cerium oxide and mixtures or mixed oxides thereof, and in that the first catalyst additionally comprises at least one zeolite for storage of hydrocarbons, and in that the particulate filter is coated with a second catalyst which does not comprise a zeolite over a fraction of the length proceeding from the entry side.
Dependencies are inferred from the claim text.