B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 23/58 (2006.01) B01D 53/94 (2006.01) B01J 21/04 (2006.01) F01N 3/28 (2006.01) B01J 37/02 (2006.01)
Patent
CA 2224958
A catalyst for exhaust gas purification is capable of purifying the hydrocarbons, nitrogen oxides and carbon monoxide present in the exhaust gas discharged from an internal combustion engine. The catalyst has a monolithic carrier and a catalyst layer containing Pd, Ba and a heat-resistant inorganic oxide, formed on the carrier. The amount of Pd supported on monolithic carrier is 100-300 g per ft3 of monolithic carrier (3.53x10-3 to 1.06x10-2 g per cc of monolithic carrier), the amount of Ba supported on monolithic carrier is 0.010-0.060 g per cc of monolithic carrier in terms of BaO, and the weight ratio of Pd and Ba as expressed as BaO is 1:2 to 1:10. This catalyst for exhaust gas purification is superior particularly in hydrocarbon purification for a low-temperature fuel-rich exhaust gas (such as exhaust gas emitted during cold start) of automobile.
Divulgation d'un catalyseur capable de purifier les hydrocarbures, les oxydes d'azote et le monoxyde de carbone présents dans les gaz d'échappement d'un moteur à combustion interne. Le catalyseur comporte un support solide monolithique recouvert d'une couche contenant du Pd, du Ba et un oxyde inorganique résistant à la chaleur. La quantité de Pd sur le support varie entre 100 et 300 g par pi3 de support (de 3,53x10-3 à 1,06x10-2 g par cc de support). La quantité de Ba, sous forme de BaO, sur le support varie entre 0,010 et 0,060 g par cc de support, et le ratio en poids de Pd et de Ba exprimé sous forme de BaO est de 1:2 à 1:10. Ce catalyseur est supérieur particulièrement dans la purification des hydrocarbures pour un gaz d'échappement riche en combustible à basse température (comme les gaz d'échappement libérés pendant le démarrage à froid) d'une automobile.
Mizuno Hiroshige
Noda Naomi
Shibagaki Yukinari
Takahashi Akira
Marks & Clerk
Ngk Insulators Ltd.
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