US5511972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst structure for use in a partial combustion process
Assignee: International Engine Intellectual Property Co LLC
•
Filing: 1995-01-11
•
Granted: 1996-04-30
•
Expires: 2015-01-11
Abstract
Abstract This invention is both a partial combustion process in which the fuel is partially combusted using specific catalysts and catalytic structures and also a catalyst structure for use in the process. The choice of catalysts and supports solves problems in the art dealing with the stability of the overall catalyst structure and ease of catalyst operation. The catalyst structure is stable due to its comparatively low operating temperature, has a low temperature at which catalytic combustion begins, and yet is not susceptible to temperature "runaway". The combustion gas produced by the catalytic process typically is below the autocombustive temperature for the gas mixture; the gas may be used at that temperature, or fed to other combustion stages for ultimate use in a gas turbine, furnace, boiler, or the like.
Inventors
- 👤 Ralph A. Dalla Betta
- 👤 Toru Shoji
- 👤 Kazunori Tsurumi
- 👤 Nobuyasu Ezawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:34
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/44; B01J37/00; B01J37/02; B01J37/0215; B01J37/0225
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
97 words
A catalyst structure comprised of: a. a metallic catalyst support having longitudinal passageways adapted for the passage of combustible gas and having surfaces in those passageways for the placement of a catalytic material, b. a catalyst material active for the partial combustion of a combustible fuel, the catalyst material comprising palladium on at least a portion of the metallic support longitudinal passageways, and c. means for maintaining the temperature of the catalyst structure below the TGA transition temperature of palladium, wherein the means comprises a diffusion layer of a catalytically inactive oxide upon the palladium catalytic material.
Claim 2
Dependent Claim
97 words
A catalyst structure comprised of: a. a metallic catalyst support having longitudinal passageways adapted for the passage of combustible gas and having surfaces in those passageways for the placement of a catalytic material, b. a catalyst material active for the partial combustion of a combustible fuel, the catalyst material comprising palladium on at least a portion of the metallic support longitudinal passageways, and c. means for maintaining the temperature of the catalyst structure below the TGA transition temperature of palladium, wherein the means comprises a diffusion layer of a catalytically inactive oxide upon the palladium catalytic material.
Claim 3
Dependent Claim
14 words
The structure of claim 1 where the metallic catalyst support comprises a ferrous alloy.
Claim 4
Dependent Claim
40 words
The structure of claim 2 additionally comprising a washcoat on at least a portion of the longitudinal passageways, wherein the washcoat is selected from the group consisting of alumina, zirconia, silica, titania, refractory metal oxides, noncatalytic oxides, and mixtures thereof.
Claim 5
Dependent Claim
10 words
The structure of claim 3 where the washcoat comprises alumina.
Claim 6
Dependent Claim
11 words
The structure of claim 4 where the diffusion layer comprises alumina.
Claim 7
Dependent Claim
10 words
The structure of claim 3 where the washcoat comprises zirconia.
Claim 8
Dependent Claim
11 words
The structure of claim 6 where the diffusion barrier comprises zirconia.
Claim 9
Dependent Claim
27 words
The structure of claim 1 where the catalyst material additionally comprises one or more adjunct catalyst metals selected from silver, gold, platinum, ruthenium, rhodium, iridium, or osmium.
Claim 10
Dependent Claim
13 words
The structure of claim 8 where the adjunct catalyst is silver or platinum.
Claim 11
Dependent Claim
22 words
The structure of claim 2 where the metallic catalyst support comprises a corrugated steel sheet having opposite surfaces rolled into a monolith.
Claim 12
Dependent Claim
26 words
The structure of claim 10 where the metallic catalyst support additionally comprises a steel separator sheet adjacent the corrugated steel sheet all rolled into a monolith.
Claim 13
Dependent Claim
19 words
The structure of claim 10 where the catalyst material is placed on alternating surfaces on the corrugated steel sheet.
Claim 14
Dependent Claim
22 words
The structure of claim 1 where a portion of the catalyst material on the catalyst support comprises a higher activity palladium catalyst.
Claim 15
Dependent Claim
116 words
A catalyst structure comprised of: a. a ferrous alloy metallic catalyst support having longitudinal passageways adapted for the passage of combustible gas and having surfaces in those passageways for the placement of a catalytic material, wherein the metallic catalyst support comprises a corrugated steel sheet having opposite surfaces rolled into a monolith, b. a catalyst material active for the partial combustion of a combustible fuel, the catalyst material comprising palladium on at least a portion of the metallic support longitudinal passageways, and c. means for maintaining the temperature of the catalyst structure below the TGA transition temperature of palladium, wherein the means comprises a diffusion layer of a catalytically inactive oxide upon the palladium catalytic material.
Claim 16
Dependent Claim
116 words
A catalyst structure comprised of: a. a ferrous alloy metallic catalyst support having longitudinal passageways adapted for the passage of combustible gas and having surfaces in those passageways for the placement of a catalytic material, wherein the metallic catalyst support comprises a corrugated steel sheet having opposite surfaces rolled into a monolith, b. a catalyst material active for the partial combustion of a combustible fuel, the catalyst material comprising palladium on at least a portion of the metallic support longitudinal passageways, and c. means for maintaining the temperature of the catalyst structure below the TGA transition temperature of palladium, wherein the means comprises a diffusion layer of a catalytically inactive oxide upon the palladium catalytic material.
Claim 17
Dependent Claim
26 words
The structure of claim 14 where the metallic catalyst support additionally comprises a steel separator sheet adjacent the corrugated steel sheet all rolled into a monolith.
Claim 18
Dependent Claim
18 words
The structure of claim 14 where catalytic material is placed on alternating surfaces on the corrugated steel sheet.
Claim 19
Dependent Claim
22 words
The structure of claim 14 where a portion of the catalyst material on the catalyst support comprises a higher activity palladium catalyst.
Claim 20
Dependent Claim
11 words
The structure of claim 14 where the diffusion layer comprises alumina.
Claim 21
Dependent Claim
11 words
The structure of claim 14 where the diffusion layer comprises zirconia.
Claim 22
Dependent Claim
40 words
The structure of claim 14 additionally comprising a washcoat on at least a portion of the longitudinal passageways, wherein the washcoat is selected from the group consisting of alumina, zirconia, silica, titania, refractory metal oxides, noncatalytic oxides, and mixtures thereof.
Claim 23
Dependent Claim
10 words
The structure of claim 20 where the washcoat comprises alumina.
Claim 24
Dependent Claim
11 words
The structure of claim 21 where the diffusion layer comprises alumina.
Claim 25
Dependent Claim
10 words
The structure of claim 20 where the washcoat comprises zirconia.
Claim 26
Dependent Claim
11 words
The structure of claim 23 where the diffusion layer comprises zirconia.
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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) | 1999-04-30 | 1999-10-30 | 2000-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-30 | 2003-10-30 | 2004-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-30 | 2007-10-30 | 2008-04-30 | $7700.00 | Window Closed / Lapsed |