Lean NO x trap with PGM zoned axially

Details Lean NO x trap with PGM zoned axially Lean NO x trap with PGM zoned axially

2011-01-18

2011-01-18

Nguyen, Ngoc-Yen M (Department: 1793)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S300000, C060S301000, C422S169000, C422S170000, C422S171000, C502S325000, C502S326000, C502S328000, C502S330000

Reexamination Certificate

active

07870724

ABSTRACT:
The present invention provides a thermally stable catalyst for treating automobile exhaust by-products is provided. The catalyst of the invention comprises a first section that includes a precious metal present in a first concentration and a second section that includes a precious metal present in a second concentration. The catalyst of the invention is characterized by a unique precious metal concentration profile in which the first concentration of the precious metal is lower than the second concentration of the precious metal. When placed with an automobile exhaust system, the second section is positioned downstream of the first section. The present invention also provides a lean NOxtrap utilizing the unique precious metal concentration profile. The NOxtrap is found to possess improved NOxconversion performance relative to a NOxtrap with the same total amount of precious metal deposited uniformly over the volume of the trap.

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