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Title: Method and apparatus to selectively reduce NO.sub.x in an exhaust gas feedstream

Patent ·
OSTI ID:1023934
 [1];  [2];  [3];  [4];  [5]
  1. Troy, MI
  2. Shelby Township, MI
  3. Sterling Heights, MI
  4. Macomb Township, MI
  5. Rochester Hills, MI
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A method and apparatus are described to selectively reduce NO.sub.x emissions of an internal combustion engine. An exhaust aftertreatment system includes an injection device operative to dispense a hydrocarbon reductant upstream of a silver-alumina catalytic reactor device. A control system determines a NO.sub.x concentration and hydrocarbon/NOx ratio based upon selected parameters of the exhaust gas feedstream and dispenses hydrocarbon reductant during lean engine operation. Included is a method to control elements of the feedstream during lean operation. The hydrocarbon reductant may include engine fuel.

Research Organization:
GM Global Technology Operations LLC (Detroit, MI)
Sponsoring Organization:
USDOE
DOE Contract Number:
FC26-02NT41218
Assignee:
GM Global Technology Operations LLC (Detroit, MI)
Patent Number(s):
8,006,481
Application Number:
11/533,434
OSTI ID:
1023934
Country of Publication:
United States
Language:
English

References (3)

In-Cylinder Production of Hydrogen During Net-Lean Diesel Operation conference April 2006
Selective Catalytic Reduction of NOx Emissions from a 5.9 Liter Diesel Engine Using Ethanol as a Reductant conference October 2003
Selective Catalytic Reduction of NOx with N-Free Reductants journal January 1995

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