US4088435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the combustion of carbonaceous fuels utilizing high temperature stable catalysts
Assignee: Engelhard Minerals and Chemicals Corp
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Filing: 1976-04-05
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Granted: 1978-05-09
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Expires: 1996-04-05
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, selected VIB metal oxides, and a metallic oxide or oxide mixture wherein the metal or metals are selected IIA, IVA, and IIA-IVA mixtures, selected IIA and IVB mixtures and selected IVA and IVB mixtures. The slips or carrier compositions are calcined at a temperature of at least 500 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 2 hours.
Inventors
- 👤 Saul G. Hindin
- 👤 George R. Pond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:42
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/864; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/64; B01J23/652
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 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 comprising: (a) a catalytically-active, calcined composite of alumina; a first metal oxide component selected from the group consisting of an oxide of chromium, tungsten, and mixtures thereof; and a second metal oxide component selected from the group consisting of an oxide of (i) a metal selected from the group consisting of calcium, strontium, barium, silicon, tin, and mixtures thereof and (ii) mixtures of zirconium with a metal selected from the group consisting of calcium, strontium, barium, silicon, tin, 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 500° C.
Claim 2
Independent Claim
166 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 comprising: (a) a catalytically-active, calcined composite of alumina; a first metal oxide component selected from the group consisting of an oxide of chromium, tungsten, and mixtures thereof; and a second metal oxide component selected from the group consisting of an oxide of (i) a metal selected from the group consisting of calcium, strontium, barium, silicon, tin, and mixtures thereof and (ii) mixtures of zirconium with a metal selected from the group consisting of calcium, strontium, barium, silicon, tin, 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 500° C.
Claim 3
Dependent Claim
226 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 in vaporous form and 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. comprising: (a) a catalytically-active, calcined composite of alumina; a first metal oxide component selected from the group consisting of an oxide of chromium, tungsten, and mixtures thereof; and a second metal oxide component selected from the group consisting of an oxide of (i) a metal selected from the group consisting of calcium, strontium, barium, silicon, tin, and mixtures thereof and (ii) mixtures of zirconium with a metal selected from the group consisting of calcium, strontium, barium, silicon, tin, 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 500° 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)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |