Patent US4635496A successfully refreshed from Google Patents.
US5259754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Partial combustion catalyst of palladium on a zirconia support and a process for using it
Assignee: Tanaka Precious Metal Technologies Co Ltd
•
Filing: 1990-11-26
•
Granted: 1993-11-09
•
Expires: 2010-11-26
Abstract
Abstract This invention is a catalyst comprising palladium on a support containing zirconium and a partial combustion process in which the fuel is partially combusted using that catalyst. The choice of catalysts and supports solves a problem dealing with the long term stability of palladium as a partial combustion catalyst. The catalyst structure is stable in operation, has a comparatively low operating temperature, has a low temperature at which oxidation begins, and yet is not susceptible to temperature "runaway". The combustion gas produced by the catalytic process typically is at a temperature below the autocombustive temperature and may be used at that temperature or it may be fed to other combustion stages for further use in a gas turbine, furnace, boiler, or the like.
Inventors
- 👤 Ralph A. Dalla Betta
- 👤 Kazunori Tsurumi
- 👤 Toru Shoji
- 👤 Robert L. Garten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:41
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; F; F01; F01N; F01N2330/00; F01N2330/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
117 words
A partial combustion process comprising the steps of: a. mixing an amount of air and methane to produce a combustible gas mixture having an adiabatic combustion temperature, and b. passing the combustible gas mixture into a combustion zone containing a catalyst support of a spiral of corrugated ferrous alloy sheet having longitudinal passageways for the passage and partial combustion of the combustible gas mixture and having a catalyst comprising palladium and a coating of a zirconium containing material in at least a portion of the passageways in said support, to produce a partially combusted exhaust gas having a bulk temperature and a catalyst temperature less than less than the adiabatic combustion temperature of the combustible gas mixture.
Claim 2
Dependent Claim
117 words
A partial combustion process comprising the steps of: a. mixing an amount of air and methane to produce a combustible gas mixture having an adiabatic combustion temperature, and b. passing the combustible gas mixture into a combustion zone containing a catalyst support of a spiral of corrugated ferrous alloy sheet having longitudinal passageways for the passage and partial combustion of the combustible gas mixture and having a catalyst comprising palladium and a coating of a zirconium containing material in at least a portion of the passageways in said support, to produce a partially combusted exhaust gas having a bulk temperature and a catalyst temperature less than less than the adiabatic combustion temperature of the combustible gas mixture.
Claim 3
Dependent Claim
22 words
The process of claim 1 where the catalyst is at least partially covered by a diffusion barrier comprising a catalytically inactive oxide.
Claim 4
Dependent Claim
11 words
The process of claim 2 where the diffusion barrier comprises zirconia.
Claim 5
Dependent Claim
28 words
The process of claim 3 where the combustible gas mixture is preheated to a temperature of more than about 325° C. prior to passage into the combustion zone.
Claim 6
Dependent Claim
19 words
The process of claim 4 where only a portion of the surfaces of the longitudinal passageways comprise the catalyst.
Claim 7
Dependent Claim
40 words
The process of claim 5 where the portion of the surfaces of the longitudinal passageway surfaces containing the catalyst are adjacent to passageway surfaces not containing the catalyst and those surfaces are in integral heat exchange relationship to each other.
Claim 8
Dependent Claim
53 words
A catalyst structure comprising of: a. a catalyst support having longitudinal passageways adapted for the passage of combustible gas and having surfaces in those passageways for the placement of a catalyst material, b. a catalyst material comprising palladium on a zirconium-containing material in at least a portion of the metallic support longitudinal passageways.
Claim 9
Dependent Claim
53 words
A catalyst structure comprising of: a. a catalyst support having longitudinal passageways adapted for the passage of combustible gas and having surfaces in those passageways for the placement of a catalyst material, b. a catalyst material comprising palladium on a zirconium-containing material in at least a portion of the metallic support longitudinal passageways.
Claim 10
Dependent Claim
35 words
The structure of claim 7 additionally comprising a diffusion barrier on at least a portion of the longitudinal passageways of a member selected from the group of refractory metal oxides, non-catalytic oxides, or mixtures thereof.
Claim 11
Dependent Claim
11 words
The structure of claim 8 where the diffusion barrier comprises zirconia.
Claim 12
Dependent Claim
21 words
The structure of claim 7 where the catalyst support comprises a corrugated steel sheet having opposite surfaces rolled into a monolith.
Claim 13
Dependent Claim
25 words
The structure of claim 10 where the catalyst support additionally comprises a steel separator sheet adjacent the corrugated steel sheet all rolled into a monolith.
Claim 14
Dependent Claim
18 words
The structure of claim 10 where catalytic material is placed on alternating surfaces on the corrugated steel sheet.
Claim 15
Dependent Claim
15 words
The structure of claim 7 where the palladium is in intimate admixture with the material.
Claim 16
Dependent Claim
30 words
The structure of claim 7 where the catalyst material also contains up to about 50 mole percent of an adjunct catalyst selected from Group VIII noble and Group IB metals.
Claim 17
Dependent Claim
11 words
The structure of claim 7 where the structure is substantially chloride-free.
References Cited (Backward Citations)
US3969082A
Cited
US3956188A
Cited
US3966391A
Cited
US4008037A
Cited
US4021185A
Cited
US4088435A
Cited
US3920583A
Cited
US3970435A
Cited
US4019969A
Cited
GB1528455A
Cited
US4287856A
Cited
US4331631A
Cited
US4279782A
Cited
US4318828A
Cited
US4366668A
Cited
US4673663A
Cited
US4414023A
Cited
JPS6014939A
Cited
JPS6014938A
Cited
JPS6026211A
Cited
JPS6051545A
Cited
JPS6051543A
Cited
JPS6051544A
Cited
JPS6054736A
Cited
JPS6060411A
Cited
JPS6060424A
Cited
JPS6066022A
Cited
US4601999A
Cited
US4731989A
Cited
JPS60147243A
Cited
JPS60175925A
Cited
JPS60196511A
Cited
JPS60202745A
Cited
JPS60200021A
Cited
JPS60202235A
Cited
JPS60205115A
Cited
JPS60205129A
Cited
JPS60205116A
Cited
JPS60222145A
Cited
US4521532A
Cited
JPS60238148A
Cited
JPS6133233A
Cited
JPS6138627A
Cited
JPS61147014A
Cited
JPS61235609A
Cited
EP0198948A2
Cited
JPS61237905A
Cited
JPS61252408A
Cited
JPS61252409A
Cited
JPS6241151A
Cited
JPS6246116A
Cited
JPS6249125A
Cited
JPS6279847A
Cited
JPS6280419A
Cited
JPS6280420A
Cited
JPS6284215A
Cited
JPS62112910A
Cited
US4742038A
Cited
JPS62125210A
Cited
JPS62158910A
Cited
US4784984A
Cited
JPS62216642A
Cited
US4752599A
Cited
JPS62261803A
Cited
JPS6341720A
Cited
EP0266875A1
Cited
JPS63190644A
Cited
JPS6380849A
Cited
JPS6380848A
Cited
JPS6380847A
Cited
JPS63213723A
Cited
JPS63267804A
Cited
US4870824A
Cited
JPH01139911A
Cited
JPH01210707A
Cited
JPH01242151A
Cited
US5026611A
Cited
JPH0222117A
Cited
JPH0252930A
Cited
US4893465A
Cited
JPH0259045A
Cited
JPH02211255A
Cited
JPH02213607A
Cited
JPH02238206A
Cited
JPH02268830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |