Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine
Patent
1997-04-08
1999-03-30
Lewis, Michael
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Mixture is exhaust from internal-combustion engine
502302, 502304, 502325, 502349, 423230, 4232391, B01J 2310
Patent
active
058884645
ABSTRACT:
A catalytic material effective for the reduction of NO.sub.x and the oxidation of at least carbon monoxide includes an oxygen storage component that provides superior oxygen storage function. The oxygen storage component includes an intimately combined mixed oxides including cerium, neodymium and zirconium. Typically, the ceria constitutes more than about 30 percent by weight of the ceria plus zirconia in the intimately combined mixed oxide, e.g., from about 32 to 44 weight percent. Preferably, the intimately combined mixed oxide also includes up to about 26 percent neodymia by weight of the ceria, e.g., from 18.6 to 23.5 percent. The intimately combined mixed oxide may be a co-formed material that may be prepared by, e.g., co-precipitating compounds of zirconium and the rare earth metal and calcining the co-precipitate.
REFERENCES:
patent: 4714694 (1987-12-01), Wan et al.
patent: 5057483 (1991-10-01), Wan
patent: 5075276 (1991-12-01), Ozawa et al.
patent: 5212142 (1993-05-01), Dettling
patent: 5248650 (1993-09-01), Sekiba et al.
patent: 5478543 (1995-12-01), Murota et al.
patent: 5532198 (1996-07-01), Chopin et al.
E. Luccini et al; Preparation of Zirconia-Ceria Powders by Coprecipitation . . . With Urea; 1989; Int. J. of Materials and Product Technology; vol. 4, No. 2, pp. 167-175 no month.
Steger John J.
Wan Chung-Zong
Wu Joseph Hui-Zhao
Engelhard Corporation
Ghyka Alexander G.
Lewis Michael
Negin Richard A.
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