Exhaust gas purifying apparatus

Details Exhaust gas purifying apparatus Exhaust gas purifying apparatus

B - Operations, Transporting

01

D

B01D 53/94 (2006.01) F01N 3/10 (2006.01) F01N 3/20 (2006.01) F01N 3/22 (2006.01) F01N 3/28 (2006.01) F01N 13/02 (2010.01) F01N 7/02 (2006.01)

Patent

CA 2119848

In an exhaust gas purifying apparatus including first and second exhaust converters composed of a honeycomb catalytic substrate, arranged in sequence from an exhaust manifold towards downstream exhaust gas flow of an engine, wherein the catalytic substrate of the first converter has a heat capacity of not exceeding 0.5 J/K per 1 cm3 in temperatures ranging from room temperature up to 300°C, and the catalytic substrate of the second converter has a geometric surface area of at least 25 cm2/cm3. The first converter purifies exhaust gas immediately after starting up and before completion of warming up of the engine, and the second converter further purifies noxious contents still remaining as being beyond capacity of the first converter.

Dans un appareil de purification des gaz d'échappement, comprenant un premier et un second convertisseurs de ces gaz, constitués d'un substrat catalytique en nids d'abeilles et disposés en série à partir d'un collecteur d'échappement vers l'aval du flux de gaz d'échappement d'un moteur; le substrat catalytique du premier convertisseur a une capacité thermique ne dépassant pas 0,5 J/K par cm3 à des températures se situant entre celle de la pièce et 300 degrés C; le substrat catalytique du second convertisseur a une aire surfacique géométrique d'au moins 25 cm2/cm3. Le premier convertisseur purifie les gaz d'échappement immédiatement après le démarrage et avant le réchauffement complet du moteur; le second convertisseur élimine les composés nocifs qui restent après dépassement de la capacité de purification du premier convertisseur.

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