Vehicle sulfur oxide trap and related method

Details Vehicle sulfur oxide trap and related method Vehicle sulfur oxide trap and related method

2007-04-03

2007-04-03

Cooke, Colleen P. (Department: 1754)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C502S340000, C423S244070, C423S213200, C423S239100

Reexamination Certificate

active

11275686

ABSTRACT:
An automobile exhaust system includes a catalytic converter and a modified NOx trap wit improved sulfur tolerance. Sulfur oxide has a deleterious effect on the performance of nitrogen oxide traps. In the modified NOx trap, a sulfur oxide trap is integrated with a nitrogen oxide trap by coating the catalyst contained within a nitrogen oxide trap with a mixed oxide layer of calcium oxide and magnesium oxide. The NOx trap is regenerated by heating at elevated temperature for a short time period.

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