Patent ID: 8479500
Filing Date: 2013-07-09
Classification: B01D,F01N,Y02T

Abstract:
1. An exhaust gas treatment system for an internal combustion engine comprising: an exhaust gas conduit in fluid communication with, and configured to receive an exhaust gas from the internal combustion engine; a selective catalytic reduction device comprising a flow-through substrate packaged in a rigid canister having an inlet and an outlet in fluid communication with the exhaust gas in the exhaust gas conduit; a selective catalytic reduction composition disposed on the flow-through substrate for reduction of oxides of nitrogen (“NO a particulate filter device having a wall-flow substrate configured to filter the exhaust gas of carbon and other particulates disposed in the rigid canister downstream of the selective catalytic reduction device; a dosing system comprising a controller in signal communication with a NO an ammonia-neutral oxidation catalyst compound, that is substantially un-reactive with respect to ammonia in the exhaust gas, is dispersed into the wall-flow substrate of the particulate filter device and configured to pass-through ammonia constituents of the exhaust gas exiting the selective catalytic reduction device such that little or none of the ammonia is converted to NO