Two-stage exhaust gas conversion catalyst system

Details Two-stage exhaust gas conversion catalyst system Two-stage exhaust gas conversion catalyst system

B - Operations, Transporting

01

J

B01J 29/06 (2006.01) B01D 53/94 (2006.01) B01J 29/14 (2006.01) F01N 3/10 (2006.01) B01D 53/36 (1990.01) B01J 29/34 (1990.01)

Patent

CA 2115040

- 16 - ABSTRACT TWO-STAGE EXHAUST GAS CONVERSION CATALYST SYSTEM This invention is directed to a two-stage catalyst system and a method of using the system for purification of exhaust gases containing nitrogen oxides, carbon monoxide and hydrocarbons. The exhaust gas may be automobile exhaust gas and invention is adapted to be useful in lean-burn situations, i.e, with oxygen rich environments. The system comprises as a first stage catalyst a combination of (i) refractory oxide impregnated with transition metal and (ii) transition metal-containing zeolite; and as a second stage catalyst an oxidative catalyst such as palladium on alumina.

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