초록 ▼

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 alumin

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 CeO2) 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.

대표청구항 ▼

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) dispersing one or more platinum group metal catalytic components on an activated alumina; (b)

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) dispersing one or more platinum group metal catalytic components on an activated alumina; (b) impregnating bulk ceria or a bulk ceria precursor with a liquid dispersion of an aluminum-stabilizer precursor and calcining the impregnated ceria to provide an aluminum-stabilized ceria; (c) dispersing one or more non-rhodium platinum group metal components on the aluminum-stabilized ceria; and (d) combining the ceria from step (b) with the activated alumina to form an alumina-ceria mixture.