Reduction in the quantity of NO.sub.x in lean exhaust gas of mot

Details Reduction in the quantity of NO.sub.x in lean exhaust gas of mot Reduction in the quantity of NO.sub.x in lean exhaust gas of mot

1993-03-04

1994-10-11

Dees, Carl F.

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

And additional al or si containing component

502 65, 502 66, 502 78, B01J 2922, B01J 3504

Patent

active

053547209

ABSTRACT:
A catalyst is described for reducing the quantity of nitrogen oxides in lean exhaust gas of motor vehicle engines. The catalyst contains, on a structure reinforcing body, a first catalytic coating of an aluminum oxide and/or cerium oxide of large surface area impregnated with a mixture of iridium and platinum as catalytically active noble metal components. A second catalytic coating including a zeolite of the mordenite type containing copper and/or iron is applied to the first coating layer.

REFERENCES:
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patent: 5053378 (1991-10-01), Blanchard et al.
patent: 5116586 (1992-05-01), Baacke et al.
patent: 5157007 (1992-10-01), Domesle
patent: 5177041 (1993-01-01), Huriuchi et al.
Brettschneider, "Berechnung des Luftverhaeltnisses .lambda. von Luft-Kraftstoff-Gemischen und des Einflusses von Messfehlern auf .lambda." Bosch Techn., Berichte, 6, (1979), pp. 177-186.
Database WPI, Week 8926, Dewent Publications, Ltd., No. 89-188667 to Toyota, which relates to JP-A-1,127,044.
Database WPI, Week 8928, Derwent Publications, Ltd., No. 89-201843 to Toyota, which relates to JP-A-1,139,144.

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