Process for checking the operatability of a nitrogen oxide storage catalyst
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United States of America Patent
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Feb 3, 2004
Grant Date -
Jan 31, 2002
app pub date -
Apr 11, 2001
filing date -
Apr 11, 2000
priority date (Note) -
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Abstract
The present invention provides processes for checking the operability of a nitrogen oxide storage catalyst during operation of a lean burn engine. The processes of the present invention utilize a nitrogen oxide storage material, a catalytically active component and optionally an oxygen storage material. During lean burn engine operation, damage to the catalytically active components is detected if the nitrogen oxide storage capacity in the kinetically controlled temperature range is lowered and damage to the storage material is detected if the nitrogen oxide storage capacity is lowered in the thermodynamically controlled temperature range.
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