Parkhurst & Wendel, L.L.P.
Catalyst for exhaust gas purification and system for exhaust gas purification
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 (3.53&times;10&#8722;3 to 1.06&times;10&#8722;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.
NGK Insulators, Ltd.
Y Y F B B B
Y02A Y02T F01N B01J B01J B01D
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Hiroshige Yukinari Akira Naomi
Mizuno Shibagaki Takahashi Noda