초록 ▼

An apparatus for treating an exhaust gas stream from cold startup through continuous operating conditions of an internal combustion engine includes an oxidizing catalyst bed disposed in an exhaust pipe and a reducing catalyst bed disposed in the exhaust pipe downstream from the oxidizing catalyst be

An apparatus for treating an exhaust gas stream from cold startup through continuous operating conditions of an internal combustion engine includes an oxidizing catalyst bed disposed in an exhaust pipe and a reducing catalyst bed disposed in the exhaust pipe downstream from the oxidizing catalyst bed. The oxidizing catalyst bed has one or more oxidizing catalysts and the reducing catalyst bed has one or more reducing catalysts. A method is provided for treating an exhaust gas stream both during cold start and during continuous operating conditions of an internal combustion engine by passing the stream through an oxidizing catalyst bed having one or more oxidizing catalysts at a light off temperature; a reducing catalyst bed having one or more reducing catalysts and providing hydrogen into the reducing catalyst bed to condition the reducing catalyst; and introducing hydrogen into the internal combustion engine during cold startup.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for treating exhaust from an internal combustion engine in communication with an exhaust pipe, comprising:an oxidizing catalyst bed disposed in the exhaust pipe;a reducing catalyst bed disposed in the exhaust pipe downstream from the oxidizing catalyst bed;a

[ What is claimed is:] [1.] An apparatus for treating exhaust from an internal combustion engine in communication with an exhaust pipe, comprising:an oxidizing catalyst bed disposed in the exhaust pipe;a reducing catalyst bed disposed in the exhaust pipe downstream from the oxidizing catalyst bed;a source of hydrogen having a first control valve providing fluid communication with the oxidizing catalyst bed, a second control valve providing fluid communication with the reducing catalyst bed, and a third control valve providing fluid communication with the internal combustion engine;a source of oxygen having a control valve providing fluid communication with the oxidizing catalyst bed; anda control system for conditioning the oxidizing catalyst bed prior to receiving significant amounts of exhaust having a component selected from hydrocarbons, carbon monoxide, and combinations thereof, conditioning the reducing catalyst bed prior to receiving significant amounts of exhaust having NO.sub.x, and providing hydrogen to the internal combustion engine during cold start.