摘要：

Problem to be solved: to provide a catalyst article for treating lean burn engine exhaust gas. Catalyst articleHoneycomb base andIncludes a wash coat placed on itWash coatAluminaSilicaZirconiaChinatownIt contains one or more fired platinum group metal components dispersed on a carrier of a refractory metal oxide, including its physical mixture or a chemical combination such as atomically dopedThe wash coat is placed on the honeycomb substrateThe average crystallite size of the platinum group metal component is in the range of about 10 nm to about 25 nmWhen the exhaust gas passes through a honeycomb substrate having a catalystStable NO2 / NOx ratio is obtained.A method for treating exhaust gas from a lean burn engine and a system for removing contaminants from lean burn engine exhaust flow including NOx are also disclosed.No selection

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