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US 4,714,694 AGranted
Aluminum-stabilized ceria catalyst compositions, and methods of making the same
AssigneeEngelhard Corporation
InventorsChung-Zong Wan, Joseph C. Dettling
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AssigneeEngelhard Corporation
InventorsChung-Zong Wan, Joseph C. Dettling
Estimating the term…
A catalyst material comprises an aluminum-stabilized ceria which optionally may be combined with an activated alumina and may also comprise one or more platinum group metal catalytic components. A method of making the material includes impregnating bulk ceria or a bulk ceria precursor with an aluminum compound and calcining the impregnated ceria to provide an aluminum-stabilized ceria. The bulk ceria advantageously comprises a high purity (at least 90 weight percent CeO.sub.2) ceria and may be admixed with activated aluminia having one or more platinum group metal catalytic components dispersed thereon. The catalyst material may be coated onto a suitable carrier substrate and then calcined. Specified minimum levels of the aluminum-stabilized bulk ceria are advantageously employed in the catalyst materials of the invention. The bulk ceria may have one or more preferably non-rhodium platinum group metal catalytic components dispersed thereon, e.g., a platinum catalytic component, and one or more platinum group metal catalytic components dispersed on the activated alumina.
A method of making a catalyst composition comprising an aluminum-stabilized ceria, the method comprising:
A method of making a catalyst composition comprising a mixture of an activated alumina and an aluminum-stabilized ceria and one or more platinum group metal catalytic components including at least one platinum group catalytic component other than rhodium, the method comprising:
A method of making a catalyst composition comprising a mixture of an activated alumina and an aluminum-stabilized ceria and one or more platinum group metal catalytic components, the method comprising:
A catalyst composition comprising aluminum-stabilized bulk ceria containing not more than about 20% by weight aluminum, measured as Al.sub.2 O.sub.3, based on the total weight of stabilized ceria.
Dependencies are inferred from the claim text.