US3945946A
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Compositions and methods for high temperature stable catalysts
Assignee: Engelhard Minerals and Chemicals Corp
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Filing: 1973-12-10
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Granted: 1976-03-23
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Expires: 1993-12-10
Abstract
Abstract Catalysts having good high temperature stability which are particularly useful for selected high temperature reactions are disclosed as are methods for their preparation and use. The catalytically-active materials include platinum group metal deposited on a catalytic slip or composite which contains a mixture of alumina and a mixture of IVB and selected VIB metal oxides. The slips or carrier compositions are calcined at a temperature of at least 850°C. before deposition of platinum group metal and characterized by having a surface area of at least 20 m 2 /g after calcination at a temperature of 1200°C. for two hours.
Inventors
- 👤 Saul G. Hindin
- 👤 Joseph C. Dettling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:36
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/864; B01J23/10; B01J23/16; B01J23/24; B01J23/40; B01J35/00; B01J35/60; B01J35/61; B01J35/612
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
106 words
A catalyst composition characterized by a surface area of at least 20 m 2 /g after calcination for two hours at 1200° C. consisting essentially of (a) a catalytically-active, calcined composite consisting essentially of alumina, and a mixture of two metal components wherein the first component is selected from the group consisting of an oxide of chromium, tungsten, and mixtures thereof and the second component is selected from the group consisting of an oxide of a Group IVB metal, and mixtures thereof, and (b) a catalytically-effective amount of platinum group metal added thereto after calcination of said composite at a temperature of at least 850° C.
Claim 2
Dependent Claim
106 words
A catalyst composition characterized by a surface area of at least 20 m 2 /g after calcination for two hours at 1200° C. consisting essentially of (a) a catalytically-active, calcined composite consisting essentially of alumina, and a mixture of two metal components wherein the first component is selected from the group consisting of an oxide of chromium, tungsten, and mixtures thereof and the second component is selected from the group consisting of an oxide of a Group IVB metal, and mixtures thereof, and (b) a catalytically-effective amount of platinum group metal added thereto after calcination of said composite at a temperature of at least 850° C.
Claim 3
Dependent Claim
43 words
A composition as defined in claim 1 wherein said composite contains about 80 to 95 weight percent of said alumina, about 2 to 15 weight percent of said first component oxide and about 2 to 15 weight percent of said second component oxide.
Claim 4
Dependent Claim
24 words
A composition as defined in claim 2 wherein said first component oxide is predominantly chromia and wherein said second component oxide is predominantly zirconia.
Claim 5
Dependent Claim
43 words
A composition as defined in claim 1 wherein said platinum group metal is present in an amount of about 0.1 to 20 percent by weight of said composite and is selected from the group consisting of platinum, palladium, platinum-palladium alloys, and mixtures thereof.
Claim 6
Dependent Claim
12 words
A composition as defined in claim 1 wherein said composite is pellets.
Claim 7
Dependent Claim
126 words
A catalyst composition consisting essentially of (a) an inert support, (b) a catalytically-active calcined composite deposited on said support, said composite consisting essentially of alumina, and a mixture of two metal oxide components wherein the first component is selected from the group consisting of an oxide of chromium, tungsten, and mixtures thereof and the second component is selected from the group consisting of an oxide of a Group IVB metal, and mixtures thereof, said composite having been calcined at a temperature of at least 850° C before deposition on said support and characterized by a surface area of at least 20 m 2 /g after calcination for two hours at 1200° C. and (c) a catalytically-effective amount of a platinum group metal incorporated in said composite.
Claim 8
Dependent Claim
126 words
A catalyst composition consisting essentially of (a) an inert support, (b) a catalytically-active calcined composite deposited on said support, said composite consisting essentially of alumina, and a mixture of two metal oxide components wherein the first component is selected from the group consisting of an oxide of chromium, tungsten, and mixtures thereof and the second component is selected from the group consisting of an oxide of a Group IVB metal, and mixtures thereof, said composite having been calcined at a temperature of at least 850° C before deposition on said support and characterized by a surface area of at least 20 m 2 /g after calcination for two hours at 1200° C. and (c) a catalytically-effective amount of a platinum group metal incorporated in said composite.
Claim 9
Dependent Claim
13 words
A catalyst composition as defined in claim 6 wherein said support is pellets.
Claim 10
Dependent Claim
15 words
A catalyst composition as defined in claim 6 wherein said support is a ceramic honeycomb.
Claim 11
Dependent Claim
49 words
A catalyst composition as defined in claim 6 wherein said platinum group metal is present in an amount of about 0.2 to 10 percent by weight of said composite and wherein said platinum group metal is selected from the group consisting of platinum, palladium, platinum-palladium alloys, and mixtures thereof.
Claim 12
Dependent Claim
44 words
A catalyst composition as defined in claim 6 wherein said composite contains about 80 to 95 weight percent of said alumina, about 2 to 15 weight percent of said first component oxide, and about 2 to 15 weight percent of second second component oxide.
Claim 13
Dependent Claim
25 words
A catalyst composition as defined in claim 6 wherein said first component oxide is predominantly chromia and wherein said second component oxide is predominantly zirconia.
Claim 14
Independent Claim
142 words
A method for the preparation of a catalyst composition including the steps of (a) forming an intimate admixture consisting essentially of an alumina-producing aluminum compound and a mixture of two metal compound components which upon calcining yield the corresponding oxide wherein the first of said metal compound components is selected from the group consisting of a compound of chromium, tungsten, and mixtures thereof and the second of said metal compounds components is selected from the group consisting of a compound of a Group IVB metal and mixtures thereof, (b) calcining said intimate admixture at a temperature of at least 850° C to form a catalytically-active composite thereof characterized by a surface area of at least 20 m 2 /g after calcination for two hours at 1200° C, and (c) incorporating a catalytically-effective amount of a platinum group metal with said calcined admixture.
Claim 15
Independent Claim
142 words
A method for the preparation of a catalyst composition including the steps of (a) forming an intimate admixture consisting essentially of an alumina-producing aluminum compound and a mixture of two metal compound components which upon calcining yield the corresponding oxide wherein the first of said metal compound components is selected from the group consisting of a compound of chromium, tungsten, and mixtures thereof and the second of said metal compounds components is selected from the group consisting of a compound of a Group IVB metal and mixtures thereof, (b) calcining said intimate admixture at a temperature of at least 850° C to form a catalytically-active composite thereof characterized by a surface area of at least 20 m 2 /g after calcination for two hours at 1200° C, and (c) incorporating a catalytically-effective amount of a platinum group metal with said calcined admixture.
Claim 16
Dependent Claim
13 words
A method as claimed in claim 12 wherein said aluminum compound is alumina.
Claim 17
Dependent Claim
29 words
A method as defined in claim 12 further including the steps of depositing said composite on a relatively inert substrate to form a coating thereon prior to step (c).
Claim 18
Dependent Claim
20 words
A method as defined in claim 12 further including the step of forming said intimate admixture into pellets before calcining.
Claim 19
Dependent Claim
29 words
A method as defined in claim 12 further including the step of depositing said catalyst composition on a relatively inert substrate to form a coating thereon after step (c).
Claim 20
Dependent Claim
29 words
A method as defined in claim 12 wherein said metal of said first metal compound component is chromium and said metal of said second metal compound component is zirconium.
Claim 21
Dependent Claim
24 words
A method as defined in claim 12 wherein said intimate admixture is formed by coprecipitation of said compounds from an essentially aqueous solution itself.
Claim 22
Dependent Claim
26 words
A method as defined in claim 18 wherein said coprecipitation is accomplished by adding an effective amount of a water soluble base to said aqueous solution.
Claim 23
Dependent Claim
29 words
A method as defined in claim 18 further including the step of depositing said composite on a relatively inert substrate to form a coating thereon prior to step (c).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |