Exhaust aftertreatment system and method of treating exhaust...

Details Exhaust aftertreatment system and method of treating exhaust... Exhaust aftertreatment system and method of treating exhaust...

2009-04-17

2011-11-22

Mayes, Melvin (Department: 1732)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

C423S235000

Reexamination Certificate

active

08062618

ABSTRACT:
A diesel exhaust aftertreatment system and method are provided. The system includes a lean NOxtrap for reducing NOxand a transition metal-exchanged zeolite booster catalyst positioned downstream from the lean NOxtrap for further reducing NOx. The lean NOxtrap includes a NOxadsorbent material and one or more platinum group metals, and has a platinum group metal loading of less than about 90 g/ft3. The aftertreatment system provides high NOxconversion over a broad temperature range without the use of ammonia as a major reductant.

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