Exhaust-gas purification catalytic system

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/rele...

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Bibliographische Detailangaben
Hauptverfasser:	AKAMINE MASAAKI, SHIGETSU MASAHIKO
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	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.