Technique for production of ammonia on demand in a three way catalyst for a passive selective catalytic reduction system
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United States of America Patent
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Apr 23, 2013
Grant Date -
Aug 26, 2010
app pub date -
Feb 23, 2009
filing date -
Feb 23, 2009
priority date (Note) -
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Abstract
A powertrain includes an internal combustion engine having multiple cylinders and an aftertreatment system having a selective catalytic reduction device utilizing ammonia as a reductant. An ammonia generation cycle includes operating some portion of the cylinders at an air/fuel ratio conducive to producing molecular hydrogen and some portion of the cylinders at an air/fuel ratio conducive to producing NOx. An ammonia generation catalyst is utilized between the engine and the selective catalytic reduction device to produce ammonia.
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