Loading patent…
AssigneesNissan Motor Co., Ltd., NGK Insulators, Ltd.
InventorsToshio Takahata, Hideharu Ehara, Fuminori Yamanashi, Katsuhiro Shibata, Fumio Abe, Tomoharu Kondo, Junichi Suzuki, Naomi Noda
Estimating the term…
A catalyst for exhaust gas purification has at least one monolith carrier, at least one first catalyst layer having a three-way catalytic activity, provided on the carrier, and a second catalyst layer having a hydrocarbon purification activity, provided on the first catalyst layer. In a gasoline engine automobile provided with the above catalyst for exhaust gas purification in the exhaust gas system, the hydrocarbons present in the exhaust gas can be converted at a high efficiency by introducing secondary air into the exhaust gas in front of the catalyst to make the exhaust gas lean, at the engine start when a large amount of unburnt hydrocarbons are present in the exhaust gas. Further, the engine warm-up property of the automobile can be improved by the heat generated by the catalytic reaction of the hydrocarbons. The catalyst further exhibits a three-way catalytic activity even during the steady state engine operation after warm-up.
A catalyst for exhaust gas purification, comprising:
A catalyst for exhaust gas purification, comprising:
A catalyst for exhaust gas purification, comprising:
Dependencies are inferred from the claim text.