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AssigneesToyota Jidosha Kabushiki Kaisha, Kabushiki Kaisha Toyota Chuo Kenkyusho
InventorsYukio Kinugasa, Kouhei Igarashi, Takaaki Itou, Naoto Suzuki, Takehisa Yaegashi, Takaaki Kanazawa, Takahiro Hayashi, Koji Yokota, Yasutaka Nagai
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An exhaust gas purifying catalyst, for reducing nitrogen oxides and ammonia in an exhaust gas of an internal combustion engine, in an oxidizing atmosphere, is provided. The exhaust gas purifying catalyst comprises a first catalyst having zeolite carrying platinum and copper thereon. Preferably, the exhaust gas purifying catalyst further comprises a second catalyst having zeolite carrying copper thereon. Preferably, the second catalyst is arranged upstream of the first catalyst, with respect to the exhaust gas flow.
A catalyst for purifying an exhaust gas of an internal combustion engine, the catalyst comprising a first catalyst for removing in an oxidizing atmosphere nitrogen oxide and ammonia included in the exhaust gas, the first catalyst having zeolite carrying platinum and copper thereon, the catalyst further comprising a second catalyst having zeolite carrying copper thereon, wherein the first and second catalysts are arranged in series along a flow direction of the exhaust gas with a downstream end of an upstream one of the first and second catalysts being located upstream of an upstream end of the downstream one of the first and second catalysts.
Dependencies are inferred from the claim text.