On-board ammonia generation and exhaust after treatment system using same

Patent · Tue Mar 30 00:00:00 EDT 2010

OSTI ID:1014458

Driscoll, Josh ^[1]; Robel, Wade J ^[2]; Brown, Cory A ^[3]

---

1. Dunlap, IL
2. Peoria, IL
3. Pekin, IL

Often NOx selective catalysts that use ammonia to reduce NOx within exhaust to a harmless gas require on-board storage of ammonia which can be hazardous and inconvenient. In order to generate ammonia in exhaust, the present disclosure increases a NOx concentration in exhaust from at least one combustion chamber, at least in part, by injecting fuel in a predetermined increased NOx generation sequence that includes a first injection during non-auto ignition conditions and a second injection during auto ignition conditions. At least a portion of the NOx is converted to ammonia by passing at least a portion of the exhaust with the increased NOx concentration over an ammonia-producing catalyst.

• Research Organization: Caterpillar Inc., Deerfield, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: FC05-97OR22605
• Assignee: Caterpillar Inc. (Peoria, IL)
• Patent Number(s): 7,685,809
• Application Number: U S Patent Application 11/242,172
• OSTI ID: 1014458
• Country of Publication: United States
• Language: English