Patent ID: 8800270
Filing Date: 2014-08-12
Classification: F01N

Abstract:
1. A method for reducing an amount of NO 2 in an exhaust gas mixture of an internal combustion engine, the exhaust gas mixture having a mixture of carbon monoxide, hydrocarbons, and NO 2 , the NO 2 being present in a first NO 2 concentration, the method comprising: contacting a first portion of the exhaust gas mixture with a first catalyst, the exhaust mixture being a diesel exhaust, the first catalyst including platinum in an amount from about 0.1 to 300 g/cubic foot, the first portion of the exhaust gas mixture being converted into a first oxidized exhaust mixture comprising NO passing a second portion of the exhaust gas mixture through a bypass; combining the second portion of the exhaust gas mixture with the first oxidized exhaust mixture at a position downstream of the first catalyst to produce a combined exhaust gas mixture; and contacting the combined exhaust gas mixture with a second catalyst positioned downstream of the first catalyst such that NO