IMPROVED NOX TRAP

A NOx trap catalyst is disclosed. The NOx trap catalyst comprises a first layer, the first layer comprising a first ceria-containing component having a surface area of less than 80 m2/g; a Ba/Ce/magnesium-aluminate spinel; platinum; palladium; and alumina; and a second layer, the second layer compri...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	SWALLOW, Daniel, CHANDLER, Guy Richard, PHILLIPS, Paul Richard, REID, Stuart David, STREHLAU, Wolfgang
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION STEAM ENGINES TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	A NOx trap catalyst is disclosed. The NOx trap catalyst comprises a first layer, the first layer comprising a first ceria-containing component having a surface area of less than 80 m2/g; a Ba/Ce/magnesium-aluminate spinel; platinum; palladium; and alumina; and a second layer, the second layer comprising a second ceria-containing component having a higher surface area than the first ceria-containing material present in the first layer; rhodium; and alumina.The invention also includes an exhaust system comprising the NOx trap catalyst, and a method for treating exhaust gas utilizing the NOx trap catalyst.