Exhaust gas purifying catalyst

Details Exhaust gas purifying catalyst Exhaust gas purifying catalyst

2011-08-16

2011-08-16

Nguyen, Cam N. (Department: 1736)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C502S304000, C502S327000, C502S332000, C502S333000, C502S334000, C502S339000, C502S349000, C502S355000, C502S439000, C502S527120, C502S527130, C422S180000

Reexamination Certificate

active

07998896

ABSTRACT:
An exhaust gas purifying catalyst having a good ignition performance is provided. The exhaust gas purifying catalyst1includes a catalyst substrate3and a catalyst coating layer5which contains a noble metal and a refractory inorganic oxide and is formed on the catalyst substrate. The exhaust gas purifying catalyst is characterized in that the catalyst coating layer5includes an upstream portion11located upstream and a downstream portion13located downstream in a flow direction of an exhaust gas. The upstream portion11has a layered structure including an upstream portion inside layer17and an upstream portion outside layer15. The upstream portion inside layer contains a cerium-zirconium composite oxide in which a relative proportion of CeO2is 50 to 95 wt %, as the refractory inorganic oxide, and the upstream portion outside layer15and the downstream portion13contain a cerium-zirconium composite oxide in which a relative proportion of ZrO2is 50 to 95 wt %, as the refractory inorganic oxide.

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