US3909452A
Expired / Lapsed
US
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Catalysis
Assignee: Johnson Matthey PLC
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Filing: 1972-06-13
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Granted: 1975-09-30
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Expires: 1992-06-13
Abstract
Abstract This invention relates to catalysts for use in the oxidation of organic compounds, for example methane, ethane, propylene and carbon monoxide, as well as for the production of methane by the steam reforming of naptha and naptha distillates. The catalyst includes an inert material on which there is applied an intermediate coating of at least one oxide selected from the group consisting of the oxides of titanium, zirconium, hafnium and thorium and a final or surface coating of a mixture or alloy of platinum, rhodium and optionally a base metal in which rhodium constitutes from 1-50 weight % and the base metal, if present, constitutes from 0.01 to 25 weight % of the total metal content.
Inventors
- 👤 Gary James Keith Acres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:59
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/46; B01J23/464; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J23/54; B01J23/70; B01J23/89; B01J23/8933; B01J35/00; B01J35/50; B01J35/56; B01J35/57; C; C01; C01B; C01B3/00; C01B3/02; C01B3/32; C01B3/34; C01B3/38; C01B3/40; C01B2203/00; C01B2203/10; C01B2203/1005; C01B2203/1023; C01B2203/1041; C01B2203/1047; C01B2203/1052; C01B2203/1064; C01B2203/107; C01B2203/1076; C01B2203/1082; F; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
105 words
A CATALYST FOR THE OXIDATION OF ARGANIC COMPOUND WHICH WOULD OTHERWISE CAUSE ATMOSPHERIC CONTAMINATION CONSISTING ESSENTIALLY OF AN INERT RIGID POROUS REFRACTORY CERAMIC HONEYCOMB HAVING APPLIED THERETO A FIRST ADHERENT CATALYTICALLY ATIVE REFRACTORY METAL OXIDE COATING CONTAINING AT LEAST 50% BY WEIGHT OF ALUMIAN IN WHICH ONE OR MORE OF THE OXIDES TITANIA, ZIRCONIA, HAFNIA, AND THORIA CONSTITUTE AT LEAST 5% BY WEIGHT OF THE REFRACTORY METAL OXIDE AND HAVING A SECOND COATING OF AN ALLOY CONTAINING 1-50 WT% RHODIUM, FROM 001-25 WT% BASE METAL SELECTED FROM THE GROUP CONSISTING OF CHROMIUM, IRON, COBALT, NICKEL, COPPER, SILVER ZINC, INDIUM TIN, AND NEODYMIUM SAID BALANCE PLATINUM.
Claim 2
Dependent Claim
105 words
A CATALYST FOR THE OXIDATION OF ARGANIC COMPOUND WHICH WOULD OTHERWISE CAUSE ATMOSPHERIC CONTAMINATION CONSISTING ESSENTIALLY OF AN INERT RIGID POROUS REFRACTORY CERAMIC HONEYCOMB HAVING APPLIED THERETO A FIRST ADHERENT CATALYTICALLY ATIVE REFRACTORY METAL OXIDE COATING CONTAINING AT LEAST 50% BY WEIGHT OF ALUMIAN IN WHICH ONE OR MORE OF THE OXIDES TITANIA, ZIRCONIA, HAFNIA, AND THORIA CONSTITUTE AT LEAST 5% BY WEIGHT OF THE REFRACTORY METAL OXIDE AND HAVING A SECOND COATING OF AN ALLOY CONTAINING 1-50 WT% RHODIUM, FROM 001-25 WT% BASE METAL SELECTED FROM THE GROUP CONSISTING OF CHROMIUM, IRON, COBALT, NICKEL, COPPER, SILVER ZINC, INDIUM TIN, AND NEODYMIUM SAID BALANCE PLATINUM.
Claim 3
Dependent Claim
31 words
A catalyst according to claim 1 in which the base metal is neodymium and comprises at least 50% by weight of the total base metal component present in the said alloy.
Claim 4
Dependent Claim
30 words
A catalyst according to claim 1 in which the base metal component is neodymium and comprises at least 5% by weight of the total metal present in the said alloy.
Claim 5
Dependent Claim
28 words
A catalyst according to claim 1 in which the ceramic is selected from the group consisting of zircon-mullite, mullite, alpha-alumina, sillimanite, magnesium-silicates, zircon, petalite, spodumene, cordierite and alumino-silicates.
Claim 6
Dependent Claim
23 words
A catalyst according to claim 1 in which the ceramic honeycomb contains macropores in communication with channels to provide increased accessible catalyst surface.
Claim 7
Dependent Claim
29 words
A catalyst according to claim 5 in which the structure has a macropore distribution, such that over 95% of the pores have a size greater than 2000 A units.
Claim 8
Dependent Claim
25 words
A catalyst according to claim 1 in which over 50% of the pore volume is in pores having a size of over 20,000 A units.
Claim 9
Dependent Claim
27 words
A catalyst according to claim 5 in which the superficial area of the support structure is within the range of 0.5-6.0 square metre per liter of support.
Claim 10
Dependent Claim
23 words
A catalyst according to claim 8 in which the superficial surface area is within the range 1-2.5 square metre per liter of support.
Claim 11
Dependent Claim
40 words
A catalyst according to claim 5 in which the channels through the unitary structure are large enough to permit free passage of contaminent containing gas to be purified and to prevent plugging by any solid matter entrained in the gas.
Claim 12
Dependent Claim
39 words
A catalyst according to claim 10 in which the channels are parallel and extend through the support from one side to the other and have openings which are separated from one another by thin walls defining the said openings.
Claim 13
Dependent Claim
19 words
A catalyst according to claim 11 in which a network of channels permeates the body of the support structure.
Claim 14
Dependent Claim
43 words
A catalyst according to claim 1 in which the refractory metal oxide layer containing one or more oxides of titanium, zirconium, hafnium and thorium is deposited upon the support structure in the form of a film of from 0.0004 to 0.001 inches thick.
Claim 15
Dependent Claim
27 words
A catalyst according to claim 1 in which the ceramic honeycomb has been stabilized by heating to at least 0.4 times its melting point in degrees Kelvin.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |