Multistage reductant injection strategy for slipless, high...

Details Multistage reductant injection strategy for slipless, high... Multistage reductant injection strategy for slipless, high...

2006-02-14

2006-02-14

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S276000, C060S301000

Reexamination Certificate

active

06996975

ABSTRACT:
One aspect of the invention relates to an exhaust treatment apparatus having an NOxreduction system comprising first and second catalyst beds in series with associated first and second ammonia injectors. The first catalyst bed with its associated ammonia injector preferably targets removing only about 80 to about 95% percent of the NOxin the vehicle exhaust. The second catalyst bed with its associated injector preferably target removing about 70 to about 100% of the remaining NOx. Staging the reduction system in this manner improves control over NOxreduction and reduces the risk of ammonia slip. Other aspects of the invention relate to methods of treating vehicle exhaust to remove NOxand an SCR reactor comprising a housing having an entrance port, an exit port, and an ammonia injection port, wherein the injection port is configured to inject ammonia in between SCR catalyst beds contained in the housing.

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