US 8,932,546 B2Granted

Catalytically active particulate filter and use thereof

AssigneeUmicore AG & Co. KG

InventorsStephanie Frantz, Ulrich Goebel, Franz Dornhaus, Michael Schiffer

Life of this patent

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Abstract

A catalytically active particulate filter is proposed which is suitable for use in an exhaust gas cleaning system for diesel engines. The particulate filter removes diesel soot particles from the exhaust gas and is also effective to oxidize carbon monoxide and hydrocarbons and to convert nitrogen monoxide at least proportionally into nitrogen dioxide. The particulate filter comprises a filter body (3) and two catalytically active coatings (1) and (2) which contain platinum and palladium, or platinum or palladium respectively, wherein the platinum content of the second catalytically active coating (2) is higher than the platinum content of the first catalytically active coating (1).

Claims13

Dependent claims

Catalytically active particulate filter comprising

as a filter body, a wall flow filter substrate which comprises inflow and outflow channels separated by porous walls, wherein the outflow ends of the inflow channels and the inflow ends of the outflow channels are sealed gas-tight, and
at least two catalytically active coatings, wherein the first catalytically active coating contains platinum and palladium and is situated in the porous walls between the inflow and outflow channels, and the second catalytically active coating contains platinum or palladium and platinum and is situated in the outflow channels on the porous walls between the inflow and outflow channels,
wherein the platinum content of the second catalytically active coating is higher than the platinum content of the first catalytically active coating.

Dependencies are inferred from the claim text.

Facts

Application: 13/753,089Filed 29 Jan 2013 · us provisional application
Priority: EP 121537743 Feb 2012
Published: US 2013/0280150 A124 Oct 2013
Granted: 13 Jan 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification34 codes

B01D 53/9454
Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]:…
B01D 53/944
By catalytic processes: simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
B01J 23/44
Of the platinum group metals: palladium
B01J 23/63
Platinum group metals: with rare earths or actinides