Thermally stable lean nox trap

Details Thermally stable lean nox trap Thermally stable lean nox trap

2006-11-21

2006-11-21

Tran, Binh Q. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S274000, C060S285000, C060S297000, C423S213200, C423S213500, C422S171000, C422S177000, C502S252000, C502S261000, C502S324000, C502S325000

Reexamination Certificate

active

07137249

ABSTRACT:
The present invention provides a method of removing harmful gases from an automobile exhaust. The method of the invention comprises contacting a thermally stable NOxtrap composition with a first exhaust gas mixture at a temperature of at least 200° C. The first exhaust gas mixture includes exhaust gases from an internal combustion engine operating in a fuel-lean condition. After, NOxhas been absorbed onto the NOxabsorber material, the NOxtrap composition is then contacted with a second exhaust gas composition. In this step, the second exhaust gas mixture includes exhaust gases from an internal combustion engine operating in a fuel-rich condition. The present invention also provides the NOxtrap composition used in the method. The NOxtrap of the invention includes a precious metal, a NOxabsorber material, an oxide that inhibits the decrease in NOxstoring ability of the NOxtrap composition, and a support material.

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