Integrated NO.sub.x and PM reduction devices for the treatment of emissions from internal combustion engines
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United States of America Patent
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Jun 20, 2006
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N/A
app pub date -
Feb 16, 2005
filing date -
Feb 16, 2005
priority date (Note) -
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Abstract
One aspect of the invention relates to a particulate filter useful in treating exhaust from a diesel-power vehicle. The particulate filter comprises filter elements for removing particulate matter and an ammonia SCR catalyst. Ammonia can be produced during regeneration of an NOx adsorbant. The adsorbant can be contained in a separate device upstream of the particulate filter or be incorporated within the particulate filter. Another aspect of the invention relates to a method of cleaning exhaust comprising passing the exhaust over an NOx adsorber to adsorb a portion of NOx from the exhaust; passing the exhaust through a particulate filter to remove particulate matter from the exhaust; and removing a further portion of NOx from the exhaust by reducing it with ammonia over an ammonia SCR catalyst. Preferably, a catalyst contained within the adsorbant provides NO.sub.2 for continuously regenerating the particulate filter.
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