Thermally durable, low h2s three way catalysts

Details Thermally durable, low h2s three way catalysts Thermally durable, low h2s three way catalysts

B - Operations, Transporting

01

J

B01J 23/63 (2006.01) B01D 53/94 (2006.01) B01J 23/02 (2006.01) B01J 37/02 (2006.01)

Patent

CA 2318570

An improved platinum three-way catalyst composition comprising (a) a high temperature catalyst support material, (b) a low temperature catalyst support material, (c) at least one platinum group metal, and (d) an additive effective for the suppression of hydrogen sulfide emissions, that is disposed in a separate layer either under or over a layer comprising the constituents (a), (b), and (c), or in the same layer as the constituents (a), (b), and (c). When the additive is disposed in the same layer as the constituents (a), (b), and (c), the additive is disposed in a physical structure that is segregated from the remaining components in the layer.

Composition améliorée pour convertisseur catalytique à trois voies à base de platine, qui comprend: a) un matériau support de catalyseur haute température; b) un matériau support de catalyseur faible température; c) au moins un métal du groupe du platine; et d) un additif efficace pour supprimer les émissions d'hydrogène sulfuré, disposé soit dans une couche distincte située sur ou sous une couche renfermant les constituants a), b) et c), soit dans la même couche que lesdits constituants. Quand l'additif est disposé dans la même couche que les constituants a), b) et c), il est placé dans une structure physique qui est séparée des autres composants de la couche.

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