NO.sub.x selective reduction catalyst with broadened active temp

Details NO.sub.x selective reduction catalyst with broadened active temp NO.sub.x selective reduction catalyst with broadened active temp

1998-06-12

1999-10-19

Langel, Wayne

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

502 65, 502 75, B01J 802, B01J 2906, B01J 2100

Patent

active

059684631

ABSTRACT:
The invention is a selective reduction catalyst useful for converting exhaust gases generated by a lean-burn engine where the atmosphere is oxidizing. The catalyst comprises zeolite containing two forms or rhodium, small metal particles and ion-exchanged into the zeolite, the latter being in significant excess. In addition, the catalyst contains a rare-earth metal having primarily a +3 or higher valence such as lanthanum in a significantly higher amount relative the total amount of rhodium.

REFERENCES:
patent: 4584287 (1986-04-01), Ward
ESR study of Rh/y-A1.sub.2 O.sub.3 and Rh/HZSM-5 promoted by Cu.sup.2+, Gd.sup.3+, PO.sup.3- .sub.4, by A.V. Kucherov*, S. G. Lakeev and M. Shelef, Applied Catalysis B: Environmental 16 (1998) 245-254.
Spectroscopic studies of the stability of zeolitic deNO.sub.x catalysts, by M. J. Rokosz, A. V. Kucherov, H.-W. Jen, and M. Shelef, Catalysis Today 35 (1997) 65-73.

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