Exhaust gas purification catalyst
AssigneeCataler Corporation
InventorsTaku Miura, Takashi Goto, Shunsuke Oishi
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AssigneeCataler Corporation
InventorsTaku Miura, Takashi Goto, Shunsuke Oishi
Estimating the term…
The present disclosure provides an exhaust gas purifying catalyst that may exhibit high purification performance both in a low temperature state immediately after an engine is started and during a high-load operation. The exhaust gas purifying catalyst disclosed herein contains at least one type of noble metal purifying exhaust gas, and includes a substrate, and a catalyst coat layer formed on a surface of the substrate. The catalyst coat layer is formed to have a stack structure including a lower layer provided on the substrate and an upper layer provided on the lower layer. The lower layer contains a noble metal and an oxide having an oxygen storage capacity. A noble metal-containing surface layer portion containing a noble metal is formed in at least a part of a surface portion of the upper layer. The upper layer does not contain an oxide having the oxygen storage capacity.
An exhaust gas purifying catalyst located in an exhaust gas path of an internal combustion engine and containing at least one type of noble metal that purifies exhaust gas discharged from the internal combustion engine, the exhaust gas purifying catalyst comprising:
Dependencies are inferred from the claim text.