Catalyst system for treating the exhaust from a lean-burn...

Details Catalyst system for treating the exhaust from a lean-burn... Catalyst system for treating the exhaust from a lean-burn...

F - Mech Eng,Light,Heat,Weapons

01

N

F01N 3/28 (2006.01) B01D 53/94 (2006.01) B01J 23/63 (2006.01) B01J 35/00 (2006.01)

Patent

CA 2081963

-16- Abstract of the Disclosure A catalyst system for converting NOX, CO, and HC contained in the exhaust gas from a gasoline-fueled engine controlled to operate under lean-burn conditions (R = .03 .9) such that the a ratio of NOX to HC in the exhaust gas is in the range of 1/3 to 3/1 (i.e., minimum C3H6 of 250 ppm and NOX of 200-400 ppm). The system comprises a first stage catalyst containing a transition metal-exchanged zeolite (i.e., Cu-ZSM5), and a three-way catalyst for treating the effluent from said first stage catalyst. The second stage catalyst consists of a high surface area alumina support impregnated with an intimate mixture of .5-20% lanthana, .2-30% palladium, and advantageously an outer washcoat TiO2. A method of treating the exhaust gas from a fossil-fueled engine comprising operating the engine under lean-burn conditions while controlling the emission ratio of NOX/hydrocarbon to be in the range of 1/3 to 3/1; exposing the exhaust gas to a first stage catalyst comprising a copper ion-exchanged ZSM5 zeolite having at least 3% by weight copper; and exposing the effluent from said first stage catalyst to a second stage catalyst comprising an alumina support impregnated with an intimate mixture of .5-20% lanthana and 2-30% palladium. 6224L

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