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

Abstract

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.

Inventors:
 [1];  [2];  [3];  [4]
  1. Dunlap, IL
  2. Peoria, IL
  3. Pekin, IL
  4. (Colona, IL)
Issue Date:
Research Org.:
Caterpillar Inc., Deerfield, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1014458
Patent Number(s):
7685809
Application Number:
U S Patent Application 11/242,172
Assignee:
Caterpillar Inc. (Peoria, IL)
Patent Classifications (CPCs):
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01C - AMMONIA
F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02D - CONTROLLING COMBUSTION ENGINES
DOE Contract Number:  
FC05-97OR22605
Resource Type:
Patent
Country of Publication:
United States
Language:
English

Citation Formats

Driscoll, Josh, Robel, Wade J, Brown, Cory A, and Urven, Jr., Roger L. On-board ammonia generation and exhaust after treatment system using same. United States: N. p., 2010. Web.
Driscoll, Josh, Robel, Wade J, Brown, Cory A, & Urven, Jr., Roger L. On-board ammonia generation and exhaust after treatment system using same. United States.
Driscoll, Josh, Robel, Wade J, Brown, Cory A, and Urven, Jr., Roger L. Tue . "On-board ammonia generation and exhaust after treatment system using same". United States. https://www.osti.gov/servlets/purl/1014458.
@article{osti_1014458,
title = {On-board ammonia generation and exhaust after treatment system using same},
author = {Driscoll, Josh and Robel, Wade J and Brown, Cory A and Urven, Jr., Roger L.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {3}
}

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Works referenced in this record:

In-Situ NH3 Generation for SCR NOx Applications
conference, October 2002