Three-way catalyst having an upstream single-layer catalyst
AssigneeUmicore AG & Co. KG
InventorsJohn G. Nunan, Raoul Klingmann, Ryan Andersen, Davion Clark, David H. Moser
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Abstract
Disclosed herein is a layered, three-way conversion catalyst having the capability of simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides being separated in a front and rear portion is disclosed. Provided is a catalytic composite material of a single front and two rear layers in conjunction with a substrate, where each of the layers includes a support, all layers comprise a platinum group metal component, and the rear bottom layer is substantially free of an oxygen storage component (OSC).
Claims14
A catalyst composite for the purification of exhaust gases of a combustion engine substantially running under stoichiometric conditions comprising in sequence and in order:
- a front single catalytic layer on a substrate;
- and
- a rear double layer on a substrate having a 1st (lower) catalytic layer and a 2nd (upper) catalytic layer;
- wherein the 2nd catalytic layer comprises rhodium as a platinum group metal (PGM);
- and
- wherein the front single catalytic layer and the 1st catalytic layer comprise palladium as a PGM compound;
- wherein the 1st catalytic layer contains no oxygen storage component (OSC);
- and
- wherein the front single catalytic layer forms a front zone and the rear double layer forms a rear zone where the catalyst composite is a single-brick system or the front single catalytic layer is located in a front brick and the rear double layer is located in a rear brick where the catalyst composite is a multi-brick system.
Dependencies are inferred from the claim text.