US3870455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for catalytically supported thermal combustion
Assignee: BASF Catalysts LLC
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Filing: 1973-12-10
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Granted: 1975-03-11
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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, 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*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 1,200*C. for 2 hours.
Inventors
- 👤 Saul G Hindin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:25
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/63; B01J23/64; B01J23/652; B01J23/6522
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
A METHOD FOR THE CATALYTICALLY SUPPORTED THERMAL COMBUSTION OF CARBONACEOUS FUEL TO FORM AN EFFLUENT OF HIGH THERMAL ENERGY SAID FUEL BEING IN VAPOUOUS 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 INTANTANEOUS OUTOIGNITION TEMPERATURE OF SAID FUEL-AIR ADMIXTURE BUT BELOW A TEMPERATURE THAT WOULD RESULT IN ANY SUBSTANTIAL FORMATION OF OXIDES OF NITOGROGEN COMPRISING: CONTACTING SAID FUEL-AIR ADMIXTURE WITH AN OXIDATION CATALYST HAVING A SURFACE AREA OF AT LEAST 20 M2/G AFTER CALCINATION FOR 2 HOURS AT 1,200*C. CONSISTING ESSENTIALLY OF (A) A CATALYTICALLY-ACTIVE, CALCINED COMPOSITE OF ALUMINA, CERIA, AND CHROMIA 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
149 words
A METHOD FOR THE CATALYTICALLY SUPPORTED THERMAL COMBUSTION OF CARBONACEOUS FUEL TO FORM AN EFFLUENT OF HIGH THERMAL ENERGY SAID FUEL BEING IN VAPOUOUS 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 INTANTANEOUS OUTOIGNITION TEMPERATURE OF SAID FUEL-AIR ADMIXTURE BUT BELOW A TEMPERATURE THAT WOULD RESULT IN ANY SUBSTANTIAL FORMATION OF OXIDES OF NITOGROGEN COMPRISING: CONTACTING SAID FUEL-AIR ADMIXTURE WITH AN OXIDATION CATALYST HAVING A SURFACE AREA OF AT LEAST 20 M2/G AFTER CALCINATION FOR 2 HOURS AT 1,200*C. CONSISTING ESSENTIALLY OF (A) A CATALYTICALLY-ACTIVE, CALCINED COMPOSITE OF ALUMINA, CERIA, AND CHROMIA 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
Independent Claim
149 words
A method for the catalytically supported thermal combustion of carbonaceous fuel to form 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 m2/g after calcination for 2 hours at 1,200*C. consisting essentially of (a) a catalytically-active, calcined composite of alumina, ceria, and chromia 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
Independent Claim
149 words
A method for the catalytically supported thermal combustion of carbonaceous fuel to form 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 m2/g after calcination for 2 hours at 1,200*C. consisting essentially of (a) a catalytically-active, calcined composite of alumina, ceria, and chromia 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 5
Dependent Claim
32 words
A method as defined in claim 1 said composite consisting essentially of about 50 to 95 weight percent alumina, 2 to 25 weight percent ceria, and 2 to 25 weight percent chromia.
Claim 6
Dependent Claim
29 words
A method as defined in claim 1 further comprising depositing said composite on a relatively inert substrate to form a coating thereon prior to said platinum group metal addition.
Claim 7
Dependent Claim
13 words
A method as defined in claim 3 wherein said substrate is a honeycomb.
Claim 8
Dependent Claim
26 words
A method as defined in claim 1 wherein said platinum group metal is selected from the group consisting of platinum, palladium, platinum-palladium alloys, and mixtures thereof.
References Cited (Backward Citations)
US3565830A
Cited
US3299156A
Cited
US3810732A
Cited
US3741725A
Cited
US3789022A
Cited
US3794588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |