Patent Number: 6,293,096

Title: 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.

Inventors: Khair; Magdi K. (San Antonio, TX), Hare; Charles T. (San Antonio, TX)

Assignee: Southwest Research Institute

International Classification: F01N 3/20 (20060101); B01D 53/94 (20060101); F01N 3/023 (20060101); F01N 3/08 (20060101); F01N 7/00 (20060101); F01N 7/02 (20060101); F01N 003/00 ()

Expiration Date: 09/25/2018