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AssigneesMitsubishi Jidosha Kogyo Kabushiki Kaisha, International Catalyst Technology, Inc.
InventorsKinichi Iwachido, Takayuki Onodera, Masanori Ide, Hiroaki Ohhara, Mariko Ono, Akihisa Okumura, Masao Hori
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An exhaust gas purifying catalyst which is disposed in an exhaust pipe of an internal combustion engine, includes: a substrate; and a catalyst layer, supported in the substrate and including: noble metals including platinum (Pt) and palladium (Pd); a heat-resistant inorganic oxide; and a NOx trapping material. The exhaust gas purifying catalyst adsorbs NOx in an exhaust gas when an exhaust air-fuel ratio is in a lean state and desorbs and reduces the adsorbed NOx when the exhaust air-fuel ratio is in a stoichiometric state or a rich state. (Pt/Pd) which is a ratio of amount of the platinum (Pt) to amount of the palladium (Pd) is 0.7 or more and less than 1.0.
An exhaust gas purifying catalyst which is disposed in an exhaust pipe of an internal combustion engine, the exhaust gas purifying catalyst comprising:
Dependencies are inferred from the claim text.