Umicore Autocat USA Inc.

Umicore Ag & Co Kg

Robert Reginald Loucks

Owen Herman Bailey

Christopher Simon Owens

An exhaust system for treating an exhaust gas composition having NOin a first NOconcentration. The exhaust system includes a first catalyst that contacts a first portion of the exhaust gas composition converting it into a first oxidized exhaust mixture that includes NOin a second NOconcentration that is greater than the first NOconcentration. The system further includes a bypass that receives a second portion of the exhaust gas composition and a recombination section positioned downstream of the first catalyst. The first oxidized exhaust mixture is combined with the second portion of the exhaust gas composition to produce a first combined exhaust gas mixture. A second catalyst converts the first combined exhaust gas mixture to a second combined exhaust gas mixture having a third NOconcentration that is less than the second NOconcentration. The method used by the exhaust system is also provided.

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LaSalle, Canada

Robert Reginald Loucks