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Multiple Stage Aftertreatment System

Abstract: 

NO.sub.x in an exhaust gas stream is oxidized in a first stage oxidation catalyst thereby forming NO.sub.2. In a subsequent stage, the NO.sub.2 is directed to a lean NO.sub.x trap whereat NO.sub.2 is reduced to N.sub.2. Hydrocarbon fuel is controllably injected into the gaseous stream at a position upstream of the lean NO.sub.x trap. Carbon is oxidized in a carbon trap positioned downstream from the lean NO.sub.x trap.

Patent Number: 
6,293,096
Date Of Issue: 
09/25/2001
Inventors: 

Magdi K. Khair;Charles T. Hare