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US 6,777,370 B2Granted
SOx tolerant NOx trap catalysts and methods of making and using the same
AssigneeEngelhard Corporation
InventorShau-Lin F. Chen
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AssigneeEngelhard Corporation
InventorShau-Lin F. Chen
Estimating the term…
The present invention relates to a layered catalyst composite useful for reducing contaminants in exhaust gas streams, especially gaseous streams containing sulfur oxide contaminants. More specifically, the present invention is concerned with improved catalysts of the type generally referred to as “three-way conversion” catalysts. The layered catalysts trap sulfur oxide contaminants which tend to poison three-way conversion catalysts used to abate other pollutants in the stream. The layered catalyst composites of the present invention have a sulfur oxide absorbing layer before or above a nitrogen oxide absorbing layer. The layered catalyst composite comprises a first layer and a second layer. The first layer comprises a first support and at least one first platinum component. The second layer comprises a second support and a SOx sorbent component, wherein the SOx sorbent component is selected from the group consisting of MgAl2O4, MnO, MnO2, and Li2O. The sulfur oxide absorbing layer selectively and reversibly absorbs sulfur oxides over nitrogen oxides and prevents or alleviates sulfur oxide poisoning of the nitrogen oxide trap.
A layered catalyst composite comprising a first layer and a second layer:
An axial layered catalyst composite comprising an upstream section and a downstream section:
A radial layered catalyst composite comprising a bottom layer, a first middle layer, and a top layer:
A method of forming a layered catalyst composite which comprises the steps of:
A method of forming a layered catalyst composite which comprises the steps of:
Dependencies are inferred from the claim text.