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Control of NO/NO2 Ratio to Improve SCR Efficiency for Treating Engine Exhaust Using Bypass Oxidation Catalyst

Abstract: 

Methods and systems for treating NOx-containing exhaust from an internal combustion engine. An exhaust aftertreatment system has at least a primary oxidation catalyst, a particulate filter, and a selective reduction catalyst (SCR). A bypass line diverts a portion of the exhaust from the exhaust line from a point downstream the particulate filter to a point upstream the SCR. A secondary oxidation catalyst on the bypass line is used to generate NO or NO2 to be returned to the exhaust line upstream the SCR.

Patent Number: 
8,420,036
Date Of Issue: 
04/16/2013
Inventors: 

Jason T. Miwa