US4021185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions and methods for high temperature stable catalysts
Assignee: PROSSER/ENPO INDUSTRIES Inc A DE CORP
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Filing: 1975-11-18
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Granted: 1977-05-03
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Expires: 1995-11-18
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, a rare earth metal oxide, and a metallic oxide wherein the metal is IVB, selected VIB metals, and mixtures thereof. The slips or carrier compositions are calcined at a temperature of at least 850 DEG C. before deposition of platinum group metal and characterized by having a surface area of at least 20 m2/g after calcination at a temperature of 1200 DEG C. for two hours.
Inventors
- 👤 Saul G. Hindin
- 👤 Joseph C. Dettling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:02
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/24; B01J19/248; B01J19/2485; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01D53/864; B01J12/00; B01J12/007; B01J23/00; B01J23/10; B01J23/16; B01J23/24; B01J23/38; B01J23/40; B01J23/54; B01J23/56; B01J35/00; B01J35/60; F; F23; F23C; F23C13/00; B01J35/61; B01J35/612; B01J35/613
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
A method for the combustion of carbonaceous fuel comprising: forming an intimate admixture of said fuel and air; contacting said fuel-air admixture with an oxidation catalyst at a temperature sufficient to combust said admixture, said catalyst having a surface area of at least 20 m 2 /g after calcination for two hours at a temperature of 1200° C., said catalyst consisting essentially of (a) a catalytically-active calcined composite of alumina, a rare earth metal oxide, and a metal oxide wherein said metal is selected from the group consisting of Cr, W, 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
Independent Claim
122 words
A method for the combustion of carbonaceous fuel comprising: forming an intimate admixture of said fuel and air; contacting said fuel-air admixture with an oxidation catalyst at a temperature sufficient to combust said admixture, said catalyst having a surface area of at least 20 m 2 /g after calcination for two hours at a temperature of 1200° C., said catalyst consisting essentially of (a) a catalytically-active calcined composite of alumina, a rare earth metal oxide, and a metal oxide wherein said metal is selected from the group consisting of Cr, W, 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
186 words
A method as defined in claim 1 wherein said combustion is catalytically-supported thermal combustion forming an effluent of high thermal energy said fuel being intimately admixed with air; said combustion being under essentially adiabatic conditions and being characterized by said fuel-air admixture having an adiabatic flame temperature such that upon contact with said catalyst, the operating temperature of said catalyst is substantially above the instantaneous auto-ignition temperature of said fuel-air admixture but below a temperature that would result in any substantial formation of oxides of nitrogen comprising: contacting said fuel-air admixture with an oxidation catalyst having a surface area of at least 20 m 2 /g after calcination for two hours at a temperature of 1200° C. consisting essentially of (a) a catalytically-active calcined composite of alumina, a rare earth metal oxide, and a metal oxide wherein said metal is selected from the group consisting of W, a Group IVB metal, and mixtures thereof, and mixtures of Cr and Group IVB metal 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 4
Dependent Claim
29 words
A method as defined in claim 2 further comprising depositing said composite on a relatively inert substrate to form a coating thereon prior to said platinum group metal addition.
Claim 5
Dependent Claim
13 words
A method as defined in claim 3 wherein said substrate is a honeycomb.
References Cited (Backward Citations)
US3692863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |