Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1997-03-26
2000-08-22
Bos, Steven
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
502302, 502325, 502334, 502339, B01J 2310, B01J 2340, B01J 2342
Patent
active
061072400
ABSTRACT:
A catalyst suitable for the treatment of automotive engine exhaust exhibiting enhanced oxygen storage capacity. The catalyst composition contains, in addition to a catalytic material such as one or more of platinum, rhodium and palladium dispersed on an activated alumina support, an oxygen storage component ("OSC") which is an intimately mixed oxide of ceria and praseodymia having a Pr:Ce atomic ratio in the range of about 2:100 to 100:100 and optionally containing one or more other rare earth metal oxides. The OSC is segregated from the catalytic material and may optionally have dispersed thereon a limited amount of a second catalytic metal component, such as platinum, rhodium and/or palladium. The intimately mixed oxide may be formed by co-precipitation by impregnation of bulk ceria particles with a praseodymium precursor, or any other method to form an intimately mixed oxide. The OSC may comprise at least about 5% by weight of the combined weight of the OSC and the catalytic component.
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Wan Chung-Zong
Wu Joseph Hui-Zhao
Bos Steven
Engelhard Corporation
Ghyka Alexander G.
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