US5405260A
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: 1993-07-27
•
Granted: 1995-04-11
•
Expires: 2013-07-27
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 a 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. Della Betta
- 👤 Kazunori Tsurumi
- 👤 Toru Shoji
- 👤 Robert L. Garten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:57
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: 21
Claim 1
Independent Claim
109 words
A partial combustion process comprising the steps of: a. mixing an amount of an oxygen containing gas with a combustible fuel 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 configuration comprising palladium on a coated aluminum-containing metallic catalyst support wherein the coating is comprised of a zirconium compound and the catalyst support has longitudinal passageways for the passage and partial combustion of the combustible gas mixture to produce a partially combusted exhaust gas having a bulk temperature and a catalyst temperature less than the adiabatic combustion temperature of the combustible gas mixture.
Claim 2
Dependent Claim
109 words
A partial combustion process comprising the steps of: a. mixing an amount of an oxygen containing gas with a combustible fuel 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 configuration comprising palladium on a coated aluminum-containing metallic catalyst support wherein the coating is comprised of a zirconium compound and the catalyst support has longitudinal passageways for the passage and partial combustion of the combustible gas mixture to produce a partially combusted exhaust gas having a bulk temperature and a catalyst temperature less than the adiabatic combustion temperature of the combustible gas mixture.
Claim 3
Dependent Claim
26 words
The process of claim 1 where the catalyst support additionally comprises a material selected from the group of metal and a metal having an oxide coating.
Claim 4
Dependent Claim
13 words
The process of claim 2 where the catalyst support comprises a ferrous alloy.
Claim 5
Dependent Claim
25 words
The process of claim 3 where the catalyst support comprises a ferrous alloy coated by a non-catalytic oxide, a refractory metal oxide, or mixtures thereof.
Claim 6
Dependent Claim
22 words
The process of claim 4 where the palladium is at least partially covered by a diffusion layer comprising a catalytically inactive oxide.
Claim 7
Dependent Claim
11 words
The process of claim 5 where the diffusion barrier comprises zirconia.
Claim 8
Dependent Claim
12 words
The process of claim 5 where the diffusion layer is a washcoat.
Claim 9
Dependent Claim
22 words
The process of claim 2 where the catalyst is at least partially covered by a diffusion barrier comprising a catalytically inactive oxide.
Claim 10
Dependent Claim
11 words
The process of claim 8 where the diffusion barrier comprises zirconia.
Claim 11
Dependent Claim
13 words
The process of claim 8 where the diffusion barrier layer is a washcoat.
Claim 12
Dependent Claim
23 words
The process of claim 2 where the catalyst support having longitudinal passageways is in the form of a honeycomb, tubes, or rolled corrugation.
Claim 13
Dependent Claim
16 words
The process of claim 11 where only a portion of the longitudinal passageway surfaces contain catalyst.
Claim 14
Dependent Claim
35 words
The process of claim 12 where the portion of the longitudinal passageways surfaces containing catalyst are adjacent to passageway surfaces not containing palladium and those surfaces are in integral heat exchange relationship to each other.
Claim 15
Dependent Claim
21 words
The process of claim 1 where the combustible fuel is selected from liquid fuels, gaseous fuels, oxygen containing fuels, and mixtures.
Claim 16
Dependent Claim
14 words
The process of claim 14 where the liquid fuels are selected from vaporizable fuels.
Claim 17
Dependent Claim
22 words
The process of claim 14 where the gaseous fuels are selected from the group consisting of methane, ethane, ethylene, propane, and propylene.
Claim 18
Dependent Claim
18 words
The process of claim 14 where the oxygen-containing fuels comprise C 1 -C 5 alcohols, ethers, or mixtures.
Claim 19
Dependent Claim
32 words
The process of claim 1 where the combustible gas comprises methane and the combustible gas mixture is passed into the partial combustion zone at a temperature of at least about 325°0 C.
Claim 20
Dependent Claim
20 words
The process of claim 18 where the partial combustion zone has a gauge pressure between -0.25 atm and 35 atm.
Claim 21
Dependent Claim
16 words
The process of claim 19 where the gauge pressure is between zero atm and 17 atm.
References Cited (Backward Citations)
SU189361A1
Cited
US3873469A
Cited
US3969082A
Cited
US4021185A
Cited
US3966391A
Cited
US3956188A
Cited
US4008037A
Cited
US4088435A
Cited
US3920583A
Cited
US3970435A
Cited
US4270896A
Cited
US4019969A
Cited
GB1528455A
Cited
FR2382584A1
Cited
US4287856A
Cited
US4233189A
Cited
US4331631A
Cited
US4279782A
Cited
US4318828A
Cited
US4603547A
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
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
JPS6241511A
Cited
JPS6246116A
Cited
JPS6249125A
Cited
JPS6279847A
Cited
JPS6280419A
Cited
JPS6280420A
Cited
JPS6284215A
Cited
JPS62112910A
Cited
US4742038A
Cited
JPS62125210A
Cited
JPS62158910A
Cited
US4784984A
Cited
JPS62205115A
Cited
JPS62216642A
Cited
US4752599A
Cited
JPS62261803A
Cited
JPS6341720A
Cited
JPS63190644A
Cited
JPS6380847A
Cited
JPS6380848A
Cited
JPS6380849A
Cited
JPS63213723A
Cited
JPS63267804A
Cited
US4870824A
Cited
JPH01139911A
Cited
JPH01210707A
Cited
JPH01242151A
Cited
US5026611A
Cited
JPH0222117A
Cited
JPH0252930A
Cited
US4893465A
Cited
EP0356197A1
Cited
JPH0259045A
Cited
EP0370244A1
Cited
JPH02211255A
Cited
JPH02213607A
Cited
JPH02238206A
Cited
JPH02268830A
Cited
US5183401A
Cited
US5232357A
Cited
US5248251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-10 | 1998-10-10 | 1999-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-10 | 2002-10-10 | 2003-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-10 | 2006-10-10 | 2007-04-11 | $7700.00 | Window Closed / Lapsed |