US4056489A
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High temperature stable catalyst composition and method for its preparation
Assignee: Engelhard Minerals and Chemicals Corp
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Filing: 1976-04-05
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Granted: 1977-11-01
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Expires: 1996-04-05
Abstract
Abstract Catalysts having good high temperature stability which are particularly used 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 catalyst slip or composite which contains a mixture of alumina, a rare earth metal oxide, and a mixture of metallic oxides of selected IIA and IVA metals and selected VIB metals. The slips or carrier compositions are calcined at a temperature of at least 500° 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 2 hours.
Inventors
- 👤 Saul G. Hindin
- 👤 George R. Pond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:12
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/002; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/864; B01J23/10; B01J23/16; B01J23/24; B01J23/38; B01J23/40; B01J23/54; B01J23/56; B01J35/00; B01J35/60; B01J2523/00; B01J35/61; B01J35/613
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
135 words
A catalyst composition consisting essentially of (a) a catalytically-active calcined composite of alumina, a rare earth metal oxide and a mixture of two metal oxide components wherein the first metal oxide component is selected from the group consisting of an oxide of chromium, tungsten and mixtures thereof and the second oxide component is selected from the group consisting of an oxide of calcium, strontium, barium, silicon, tin and mixtures thereof, said composite having been formed by calcination at a temperature of at least 500° C. and being characterized by a surface area of at least 20 m 2 /g when heated for 2 hours at 1200° C.; and (b) a catalytically-effective amount of a platinum group metal incorporated in said calcined composite after calcination of said composite at a temperature of at least 500° C.
Claim 2
Dependent Claim
135 words
A catalyst composition consisting essentially of (a) a catalytically-active calcined composite of alumina, a rare earth metal oxide and a mixture of two metal oxide components wherein the first metal oxide component is selected from the group consisting of an oxide of chromium, tungsten and mixtures thereof and the second oxide component is selected from the group consisting of an oxide of calcium, strontium, barium, silicon, tin and mixtures thereof, said composite having been formed by calcination at a temperature of at least 500° C. and being characterized by a surface area of at least 20 m 2 /g when heated for 2 hours at 1200° C.; and (b) a catalytically-effective amount of a platinum group metal incorporated in said calcined composite after calcination of said composite at a temperature of at least 500° C.
Claim 3
Dependent Claim
55 words
A composition as defined in claim 1 wherein said composite contains about 50 to 95 weight percent of said alumina, about 2 to 25 weight percent of said rare earth metal oxide, 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
33 words
A composition as defined in claim 2 wherein said rare earth metal oxide is predominantly neodymia, wherein said first component oxide is predominantly chromia and wherein said second component oxide is predominantly baria.
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
13 words
A composition as defined in claim 1 wherein said composite is pellet form.
Claim 7
Dependent Claim
162 words
A catalyst composition consisting essentially of (a) an inert support and deposited on said support (b) a catalytically-active calcined composite consisting essentially of alumina, a rare earth metal oxide and a mixture of two metal oxide components wherein the first oxide component is selected from the group consisting of an oxide of chromium, tungsten and mixtures thereof and the second oxide component is selected from the group consisting of an oxide of calcium, barium, strontium, silicon, tin and mixtures thereof, said composite having been formed by calcination at a temperature of at least 500° C. before being deposited on said support and being characterized by a surface area of at least 20 m 2 /g when heated for 2 hours at 1200° C. and (c) a catalytically-effective amount of a platinum group metal incorporated in said composite after said composite has been calcined at a temperature of at least 500° C. and after said composite has been deposited on said inert support.
Claim 8
Dependent Claim
162 words
A catalyst composition consisting essentially of (a) an inert support and deposited on said support (b) a catalytically-active calcined composite consisting essentially of alumina, a rare earth metal oxide and a mixture of two metal oxide components wherein the first oxide component is selected from the group consisting of an oxide of chromium, tungsten and mixtures thereof and the second oxide component is selected from the group consisting of an oxide of calcium, barium, strontium, silicon, tin and mixtures thereof, said composite having been formed by calcination at a temperature of at least 500° C. before being deposited on said support and being characterized by a surface area of at least 20 m 2 /g when heated for 2 hours at 1200° C. and (c) a catalytically-effective amount of a platinum group metal incorporated in said composite after said composite has been calcined at a temperature of at least 500° C. and after said composite has been deposited on said inert support.
Claim 9
Dependent Claim
14 words
A catalyst composition as defined in claim 6 wherein said support is pellet form.
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
58 words
A catalyst composition as defined in claim 6 wherein said composite contains about 50 to 95 weight percent of said alumina, about 2 to 25 weight percent of said rare earth metal oxide, about 2 to 15 weight percent of said first metal oxide component, and about 2 to 15 weight percent of said second metal oxide component.
Claim 13
Dependent Claim
36 words
A catalyst composition as defined in claim 6 wherein said rare earth metal oxide is predominantly neodymia, wherein said first metal oxide component is predominantly chromia, and wherein said second metal oxide component is predominantly baria.
Claim 14
Independent Claim
240 words
A method for the preparation of a catalyst composition comprising (a) forming an aqueous slurry or solution containing, either dispersed or dissolved therein, an alumina-producing aluminum compound, a rare earth metal compound which upon calcining yields the corresponding rare earth metal oxide, and a mixture of two metal compound components which upon calcining yield the corresponding metal oxides 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 compound components is selected from the group consisting of a compound of calcium, strontium, barium, silicon, tin, and mixtures thereof; (b) recovering from said slurry or solution an intimate admixture of solids comprising said alumina-producing aluminum compound, said rare earth metal compound, and said first and second metal compound components; (c) calcining said intimate admixture at a temperature of at least 500° C. to form a catalytically-active composite containing alumina, said rare earth metal oxide, and said metal oxides corresponding to said first and second metal compound components, said composite so formed being characterized by a surface area of at least 20 m 2 /g after heating for 2 hours at 1200° C.; and (d) adding to said calcined admixture an amount of a dispersion or solution of a platinum group metal or compound sufficient to obtain, upon drying or calcining, said catalyst composition containing a catalytically-effective amount of said platinum group metal.
Claim 15
Independent Claim
240 words
A method for the preparation of a catalyst composition comprising (a) forming an aqueous slurry or solution containing, either dispersed or dissolved therein, an alumina-producing aluminum compound, a rare earth metal compound which upon calcining yields the corresponding rare earth metal oxide, and a mixture of two metal compound components which upon calcining yield the corresponding metal oxides 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 compound components is selected from the group consisting of a compound of calcium, strontium, barium, silicon, tin, and mixtures thereof; (b) recovering from said slurry or solution an intimate admixture of solids comprising said alumina-producing aluminum compound, said rare earth metal compound, and said first and second metal compound components; (c) calcining said intimate admixture at a temperature of at least 500° C. to form a catalytically-active composite containing alumina, said rare earth metal oxide, and said metal oxides corresponding to said first and second metal compound components, said composite so formed being characterized by a surface area of at least 20 m 2 /g after heating for 2 hours at 1200° C.; and (d) adding to said calcined admixture an amount of a dispersion or solution of a platinum group metal or compound sufficient to obtain, upon drying or calcining, said catalyst composition containing a catalytically-effective amount of said platinum group metal.
Claim 16
Dependent Claim
13 words
A method as defined in claim 12 wherein said aluminum compound is alumina.
Claim 17
Dependent Claim
26 words
A method as defined in claim 12 further comprising depositing said composite on a relatively inert substrate to form a coating thereon prior to step (d).
Claim 18
Dependent Claim
17 words
A method as defined in claim 14 further comprising forming said intimate admixture into pellets before calcining.
Claim 19
Dependent Claim
25 words
A method as defined in claim 12 further comprising depositing said catalyst composition on a relatively inert substrate to form a coating after step (d).
Claim 20
Dependent Claim
40 words
A method as defined in claim 12 wherein said rare earth of said rare earth metal compound is neodymium said metal of said first metal compound component is chromium and said metal of said second metal compound component is barium.
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 thereof.
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
26 words
A method as defined in claim 18 further comprising depositing said composite on a relatively inert substrate to form a coating thereon prior to step (d).
Claim 24
Dependent Claim
214 words
A method as defined in claim 12, comprising (a) forming an aqueous slurry of alumina containing, dissolved therein, a rare earth metal compound which upon calcining yields the corresponding rare earth metal oxide, and a mixture of two metal compound components which upon calcining yield the corresponding metal oxides wherein the first of said metal compound components is a compound of chromium and the second of said metal compound components is selected from the group consisting of a compound of calcium strontium, barium, silicon, tin, and mixtures thereof; (b) recovering from said slurry an intimate admixture of solids comprising said alumina, said rare earth metal compound, and said first and second metal compound components; (c) calcining said intimate admixture at a temperature of at least 500° C. to form a catalytically-active composite containing alumina, said rare earth metal oxide, and said metal oxides corresponding to said first and second metal compound components, said composite so formed being characterized by a surface area of at least 20 m 2 /g after heating for 2 hours at 1200° C.; and (d) adding to said calcined admixture an amount of a solution of a platinum group metal compound sufficient to obtain, upon drying or calcining said catalyst composition containing a catalytically-effective amount of said platinum group metal.
References Cited (Backward Citations)
US3360330A
Cited
US3741725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |