Patent DE666550C successfully refreshed from Google Patents.
Patent EP0251752A1 successfully refreshed from Google Patents.
EP0251752A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Aluminum-stabilized ceria catalyst compositions and method of making same
Assignee: BASF Catalysts LLC
•
Filing: 1987-06-29
•
Granted: —
•
Expires: 2007-06-29
Abstract
Abstract 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 Ce0 2 ) ceria and may be admixed with activated alumina having one or more platinum group metal catalytic components dispersed thereon. The catalyst material may be coated onto 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.
Inventors
- 👤 Chung-Zong Wan
- 👤 Joseph C. Dettling
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 22:34
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J23/10; B01J23/63; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
30 words
A catalyst composition comprising aluminum-stabilized bulk ceria containing not more than 20% by weight aluminum, measured as Ai 2 O 3 , based on the total weight of stabilized ceria.
Claim 2
Dependent Claim
30 words
A catalyst composition comprising aluminum-stabilized bulk ceria containing not more than 20% by weight aluminum, measured as Ai 2 O 3 , based on the total weight of stabilized ceria.
Claim 3
Dependent Claim
34 words
The catalyst composition of claim 1 wherein the aluminum-stabilized ceria contains from 5 to 10 weight per cent aluminum, measured as AI 2 0 3 , based on the total weight of stabilized ceria.
Claim 4
Dependent Claim
31 words
The catalyst composition of claim 1 wherein the aluminum-stabilized ceria contains from 0.05 to 5 weight percent aluminum, measured as AI2 03 , based on the total weight of stabilized ceria.
Claim 5
Dependent Claim
22 words
The catalyst composition of any preceding claim wherein the stabilized ceria comprises from 5 to 95 weight percent of the catalyst composition,
Claim 6
Dependent Claim
33 words
The catalyst composition of any preceding claim wherein the aluminum-stabilized ceria has a particle size range such that at least 95% by weight of the particles have a diameter greater than 0.5 microns.
Claim 7
Dependent Claim
35 words
The catalyst composition of any preceding claim wherein the aluminum-stabilized ceria comprises at least 90 weight percent measured as CeO 2 , of the total of rare earth oxide constituents exclusive of its aluminum-stabilized content.
Claim 8
Dependent Claim
34 words
The catalyst composition of claim 6 wherein the aluminum-stabilized ceria comprises at least 95 weight percent measured as Ce0 2 , of the total of rare earth oxide constituents exclusive of its aluminum-stabilizer content.
Claim 9
Dependent Claim
34 words
The catalyst composition of claim 6 wherein the aluminum-stabilized ceria comprises at least 99 weight percent measured as Ce0 2 , of the total of rare earth oxide constituents exclusive of its aluminum-stabilizer content.
Claim 10
Dependent Claim
22 words
The catalytic composition of any preceding claim including one or more non-rhodium platinum group metal catalytic components dispersed on the aluminum-stabilized ceria.
Claim 11
Dependent Claim
23 words
The catalyst composition of claim 9 wherein the one or more non-rhodium platinum group metal catalytic components dispersed on the ceria comprises platinum.
Claim 12
Dependent Claim
22 words
The catalyst composition of any preceding claim further including activated alumina having one or more platinum group metal catalytic components dispersed thereon.
Claim 13
Dependent Claim
20 words
The catalyst composition of claim 11 wherein the one or more platinum group metal catalytic components comprise a platinum component.
Claim 14
Dependent Claim
20 words
The catalyst composition of claim 11 wherein the one or more platinum group metal catalytic components comprise a palladium component.
Claim 15
Dependent Claim
24 words
The catalyst composition of claim 11 wherein the one or more platinum group metal catalytic components comprise a platinum component and a palladium component.
Claim 16
Dependent Claim
24 words
The catalyst composition of claim 12 or claim 13 wherein the one or more platinum group metal catalytic components further comprise a rhodium component.
Claim 17
Dependent Claim
52 words
The catalyst composition of any of claims 11 to 15 wherein at least the activated alumina includes a modifier selected from the group consisting of one or more of alkaline earth metal oxides, rare earth metal oxides, silicon dioxide, Group IVB metal oxides, chromium oxide, iron oxide, nickel oxide, and precursors thereof.
Claim 18
Dependent Claim
17 words
The catalyst composition of any preceding claim wherein the aluminum-stabilized ceria is coated upon a carrier substrate.
Claim 19
Dependent Claim
33 words
The catalyst composition of any of claims 11 to 16 wherein the aluminum-stabilized ceria and the activated alumina plus the catalytic components respectively dispersed thereon, comprise a calcined coating on a carrier substrate.
Claim 20
Dependent Claim
37 words
The catalyst composition of claim 17 or claim 18 wherein the carrier substrate has a plurality of gas flow passages extending therethrough, the gas flow passages being defined by walls which are coated with the catalyst composition.
Claim 21
Independent Claim
41 words
A method of making a catalyst composition comprising an aluminum-stabilized ceria, the method comprising: (a) impregnating bulk ceria or a bulk ceria precursor with a liquid dispersion of an aluminum-stabilizer precursor; and (b) calcining the impregnated ceria obtained from step (a).
Claim 22
Independent Claim
41 words
A method of making a catalyst composition comprising an aluminum-stabilized ceria, the method comprising: (a) impregnating bulk ceria or a bulk ceria precursor with a liquid dispersion of an aluminum-stabilizer precursor; and (b) calcining the impregnated ceria obtained from step (a).
Claim 23
Independent Claim
44 words
A method of making a catalyst according to any of claims 1 to 19, the method comprising: (a) impregnating bulk ceria or a bulk ceria precursor with a liquid dispersion of an aluminum-stabilizer precursor; and (b) calcining the impregnated ceria obtained from step (a).
Claim 24
Dependent Claim
33 words
The method of claim 20 or claim 21 wherein the liquid dispersion of the aluminum-stabilizer precursor comprises an aqueous solution of an aluminum compound with which the ceria or ceria precursor is impregnated.
Claim 25
Dependent Claim
20 words
The method of claim 22 wherein the liquid dispersion of the aluminum-stabilizer precursor comprises an aqueous solution of aluminum nitrate.
Claim 26
Independent Claim
26 words
The method of any of claims 20 to 23 including carrying out the calcining step (b) at a temperature of from 300° C to 600° C.
Claim 27
Dependent Claim
18 words
The method of claim 24 including carrying out the calcining for a period of at least one-half hour.
Claim 28
Dependent Claim
18 words
The method of claim 24 or claim 25 including carrying out the calcining of step (b) in air.
Claim 29
Independent Claim
97 words
A method according to any of claims 20 to 26, the method comprising: (a) 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; (b) combining the ceria from step (a) with an activated alumina to form a mixture of alumina and aluminum-stabilized ceria; and (c) dispersing one or more platinum group metal catalytic components on at least one of the aluminum-stabilized ceria, the activated alumina, and the mixture thereof, provided however, only non-rhodium catalytic components are deposited on the ceria.
Claim 30
Independent Claim
85 words
A method according to any of claims 20 to 26, 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.
Claim 31
Dependent Claim
35 words
The method of claim 27 or claim 28 further including: (e) applying a coating of the mixture of alumina and aluminum-stabilized ceria to a carrier substrate; and (f) calcining the substrate coated with the mixture.
Claim 32
Dependent Claim
22 words
The method of claim 29 including carrying out the calcining step (f) at a temperature of not more than 350 0 C.
Claim 33
Dependent Claim
12 words
The method of claim 30 including carrying out the calcining in air.
Claim 34
Independent Claim
33 words
The method of any of claims 27 to 31 further including: (g) impregnating at least the activated alumina with a solution of a thermal stabilizer precursor; and (h) calcining the stabilizer-impregnated activated alumina.
Claim 35
Dependent Claim
21 words
The method of claim 32 including carrying out the calcining step (h) at a temperature of not more than 350° C.
Claim 36
Dependent Claim
14 words
The method of claim 33 including carrying out the calcining step (h) in air.
Claim 37
Independent Claim
29 words
The method of any of claims 32 to 34 wherein the activated alumina which is impregnated with the solution of a thermal stabilizer precursor is an unstabilized activated alumina.
Claim 38
Independent Claim
55 words
The method of any of claims 32 to 35 wherein the solution of a thermal stabilizer precursor is an aqueous solution containing a thermal stabilizer precursor selected from the group consisting of one or more of alkaline earth metal oxide precursors, rare earth metal oxide precursors, silicon dioxide precursors and Group IVB metal oxide precursors.
Claim 39
Dependent Claim
21 words
The method of claim 36 wherein the thermal stabilizer precursor comprises a mixture of a barium compound and a lanthanum compound.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.