NOx control for IC engines
First Claim
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1. A method for reducing the NOx content of combustion exhaust comprising:
- passing combustion gases through a multi-zone NOx reduction catalytic treatment system, wherein reagent for NOx reduction is introduced by means provided at least one point upstream of each catalyst zone.
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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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8 Claims
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1. A method for reducing the NOx content of combustion exhaust comprising:
passing combustion gases through a multi-zone NOx reduction catalytic treatment system, wherein reagent for NOx reduction is introduced by means provided at least one point upstream of each catalyst zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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