Reverse platinum group metal zoned lean NOx trap

A lean NOx trap system 12 for remediating an NOx emission in a vehicle exhaust system is capable of operation during one or more lean periods and one or more rich periods. It includes a first trap 14 connected to the exhaust system of the vehicle (6, fig 1), the first trap having a first substrate s...

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Bibliographische Detailangaben
Hauptverfasser:	JOSEPH ROBERT THEIS, ROBERT WALTER MCCABE, JUSTIN ANTHONY URA
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY 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 STEAM ENGINES THEIR RELEVANT APPARATUS TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	A lean NOx trap system 12 for remediating an NOx emission in a vehicle exhaust system is capable of operation during one or more lean periods and one or more rich periods. It includes a first trap 14 connected to the exhaust system of the vehicle (6, fig 1), the first trap having a first substrate supporting platinum, and optionally rhodium. The first trap is located upstream of a second trap 16 that comprises a second substrate supporting a quantity of platinum and rhodium. The total quantity of platinum and rhodium on the second trap is greater than or equal to the platinum quantity on the first trap. The second trap has a higher overall NOx conversion than the first trap at a low temperature range, for example 200-300{C; and the first trap has a higher overall NOx conversion than the first trap at a high temperature range, for example 400-600{C.