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US5139992A
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Three-way conversion catalyst including a ceria-containing zirconia support
Assignee: BASF Catalysts LLC
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Filing: 1990-10-23
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Granted: 1992-08-18
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Expires: 2010-10-23
Abstract
Abstract A catalyst composition includes a zirconia support on which is dispersed a limited amount of ceria to provide a zirconia/dispersed ceria support, and a rhodium catalytic component. The ceria content of the zirconia support does not exceed about fifteen percent by weight based on the combined weight of ceria plus zirconia. The resultant catalyst composition enhances the efficiency of three-way conversion catalyst systems in which it is employed, possibly by promoting the water gas shift reaction and the steam reforming of hydrocarbon. The rhodium on zirconia/dispersed ceria support may be combined with a catalytically effective amount of a platinum catalytic component to provide an effective three-way conversion catalyst.
Inventors
- 👤 Samuel J. Tauster
- 👤 Harold N. Rabinowitz
- 👤 Joseph C. Dettling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:58
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/63; B01J35/00; B01J35/19; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
70 words
A catalyst composition comprising a carrier on which is disposed a catalytic material comprising: a zirconia support having thereon from about 0.1 to 15 percent by weight ceria, calculated as CeO 2 and based on the combined weight of zirconia and ceria; a catalytically effective amount of a first rhodium catalytic component dispersed on the zirconia support; and a second rhodium catalytic component dispersed on a second activated alumina support.
Claim 2
Dependent Claim
70 words
A catalyst composition comprising a carrier on which is disposed a catalytic material comprising: a zirconia support having thereon from about 0.1 to 15 percent by weight ceria, calculated as CeO 2 and based on the combined weight of zirconia and ceria; a catalytically effective amount of a first rhodium catalytic component dispersed on the zirconia support; and a second rhodium catalytic component dispersed on a second activated alumina support.
Claim 3
Dependent Claim
20 words
The catalyst composition of claim 1 wherein the zirconia support contains from about 0.5 to 15 percent by weight ceria.
Claim 4
Dependent Claim
20 words
The catalyst composition of claim 1 wherein the zirconia support contains from about 2 to 13 percent by weight ceria.
Claim 5
Dependent Claim
24 words
The catalyst composition of claim 1 further including a catalytically effective amount of a platinum catalytic component dispersed on a first activated alumina support.
Claim 6
Dependent Claim
67 words
The catalyst composition of claim 4 wherein the catalytic material further comprises a minor amount of a high-porosity refractory metal oxide which has a greater porosity than any of the first activated alumina support, the second activated alumina support or the zirconia support, and thereby increases the porosity of the catalytic material relative to what it would be if the high-porosity refractory metal oxide were not present.
Claim 7
Dependent Claim
58 words
The catalyst composition of claim 1 or claim 2 wherein the catalytic material comprises (i) a second activated alumina support which is substantially free of rare earth oxides and has a first portion of a platinum catalytic component dispersed thereon, and (ii) an alumina-stabilized ceria support which has a second portion of the platinum catalytic component dispersed thereon.
Claim 8
Dependent Claim
19 words
The catalyst composition of claim 6 wherein the second activated alumina support is substantially free of rare earth oxides.
Claim 9
Dependent Claim
27 words
The catalyst composition of claim 6 wherein the catalytic material comprises a topcoat overlying an undercoat adhered to the carrier, the undercoat comprising a stabilized alumina support.
Claim 10
Dependent Claim
14 words
The catalyst composition of claim 8 wherein the undercoat comprises a ceria-stabilized alumina support.
Claim 11
Dependent Claim
102 words
A catalyst composition comprising a carrier on which is disposed a catalytic material comprising: (a) a zirconia/dispersed ceria phase support containing from about 0.5 to 15 percent by weight ceria, calculated as CeO 2 and having a first rhodium catalytic component dispersed thereon, (b) a first activated activated alumina support which is substantially free of rare earth metal oxides and contains a first platinum catalytic component thereon, (c) an alumina-stabilized ceria support containing a platinum catalytic component thereon, and (d) a second activated alumina support which is substantially free of rare earth metal oxides and contains a second rhodium catalytic component thereon.
Claim 12
Dependent Claim
102 words
A catalyst composition comprising a carrier on which is disposed a catalytic material comprising: (a) a zirconia/dispersed ceria phase support containing from about 0.5 to 15 percent by weight ceria, calculated as CeO 2 and having a first rhodium catalytic component dispersed thereon, (b) a first activated activated alumina support which is substantially free of rare earth metal oxides and contains a first platinum catalytic component thereon, (c) an alumina-stabilized ceria support containing a platinum catalytic component thereon, and (d) a second activated alumina support which is substantially free of rare earth metal oxides and contains a second rhodium catalytic component thereon.
Claim 13
Dependent Claim
65 words
The catalyst composition of claim 12 wherein the catalytic material further includes a minor amount of a high-porosity refractory metal oxide which has a greater porosity than either of the first and second activated alumina supports or the zirconia support and thereby increases the porosity of the catalytic material relative to what it would be if the high porosity refractory metal oxide were not present.
Claim 14
Dependent Claim
24 words
The catalyst composition of claim 10 or claim 11 wherein the catalytic material comprises a topcoat overlying an undercoat comprising a stabilized alumina support.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-08-18 | 1996-02-17 | 1996-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-18 | 2000-02-17 | 2000-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-18 | 2004-02-17 | 2004-08-18 | $7700.00 | Window Closed / Lapsed |