Apparatus for treatment of exhaust gases
AssigneeDeutsche Gold- und Silber-Scheideanstalt vormals Roessler
InventorsHerbert M. Volker, Polat Oser, Gerhard Doring, Harald Koch
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Abstract
A catalytic converter for use in the exhaust line of an internal combustion engine wherein the catalytically active noble metal coating is deposited only on the rearward portion of the inert carrier, with respect to the direction of flow of the exhaust gases, said inert carrier being fully coated with a washcoat capable of absorbing catalyst poisons before application of the catalytically active noble metal coating.
Claims3
apparatus for the purification of exhaust gases from an internal combustion engine comprising a housing for a noble metal catalyst, which noble metal catalyst is protected from catalyst poisons contained in exhaust gas from an internal combustion engine and emanating from the fuel used in said engine, said hosuing being fitted into the exhaust gas line of the internal combustion engine, wherein the catalyst comprises an inert carrier, having a washcoat being capable of absorbing the catalyst poisons, and being deposited on the entire length thereof, and a catalytically active coating deposited on part of the washcoat, the catalytically active coating essentially consisting of noble metal being deposited only on the rearward part of the catalyst in the direction of the exhaust gas flow, and the forward portion of the washcoat, being free from catalytically active coating and serving as the absorbant, extending to a length of at least about 2.5 cm.
Dependencies are inferred from the claim text.