Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
March 25, 2014
Patent Application Number
13353266
Date Filed
January 18, 2012
Patent Citations Received
Patent Primary Examiner
Patent abstract
A Rh-including catalyst layer of an upstream catalyst 3 includes Rh-doped CeZr-based mixed oxide and Rh-loading CeZr-based mixed oxide as oxygen storage/release materials. A Rh-including catalyst layer of a downstream catalyst 5 includes only Rh-doped CeZr-based mixed oxide as an oxygen storage/release material. The content of the oxygen storage/release materials included in the Rh-including catalyst layer of the upstream catalyst 3 is smaller than that of the downstream catalyst 5. The Rh-doped CeZr-based mixed oxide of the upstream catalyst 3 shows a particle size distribution having a peak particle size smaller than that of the Rh-doped CeZr-based mixed oxide of the downstream catalyst 5.
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