NOx control for IC engines
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United States of America Patent
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app pub date -
Jun 17, 2005
filing date -
Dec 17, 2003
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Abandoned
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Abstract
A multi-stage NOx reduction system employs catalysts effective at different temperature ranges and can have reagent injectors associated with each, for use in series or in parallel. A controller directs reagent introduction to one catalyst or the other as temperature and other conditions dictate. Valving can redirect exhaust to particular catalyst zones, if necessary.
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