US3920583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supports for catalyst materials
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1974-05-13
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Granted: 1975-11-18
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Expires: 1994-05-13
Abstract
Abstract A self supporting substrate support for a catalyst system is provided by a metal, preferably an aluminium bearing ferritic alloy. The metal carries an electrically insulating surface layer, such as alumina, compatible with catalytic material deposited thereon. The system is particularly suitable for catalyst systems for treating exhaust gases of internal combustion engines.
Inventors
- 👤 Stanley Frederick Pugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:28
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/92; B01D53/94; B01D53/944; B01J23/85; B01J23/86; B01J23/862; B01J23/89; B01J23/8933; B01J23/8993; B01J37/00; B01J37/02; B01J37/024
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
129 words
A CATALYST SYSTEM COMPRISING AN ALUMINUM BEARING FERRITIC STEEL SUBSTRATE, AN ELECTRICALLY INSULATING CERAMIC LAYER O A SURFACE OF SAID FERRITIC STEEL SUBSTRATE, AND A CATLYTIC MATERIAL SUPPOSED UPON THE CERAMIC LAYER, SAID ALUMINUM BEARING STEEL SUBSTRATE COMPRISING AN ALLOY OF IRON, CHROMIUM, ALUMINUM, AND YTTRIUM, AND HAVING THE PROPERTY OF FORMING AN ALUMINUM LAYER ON HEATING IN AIR, SAID ALUMINA LAYER PROTECTING THE STEEL SUBSTRATE AGAINST FURTHER OXIDATION ATTACH, AND SAID CERAMIC LAYEER COMPRISING A LAYER OF ALUMINA FORMED BY HEATING THE ALUMINUM BEARING FERRIC STEEL SUBSTRATE IN THE PRESENCE OF OXYGEN TO AUSE THE FORMATION OF A LAYER OF ALUMINA ON THE SURFACE OF THE FERRITIC STEEL SUBSTRATE FROM ALUMINUM WITHIN THE FERRITIC STEEL SUBSTRATE THEREBY FORMING A TENACIOUSLY ADHERENT CERAMIC LAYER ON SAID FERRIC STEEL SUBSTRATE.
Claim 2
Dependent Claim
129 words
A CATALYST SYSTEM COMPRISING AN ALUMINUM BEARING FERRITIC STEEL SUBSTRATE, AN ELECTRICALLY INSULATING CERAMIC LAYER O A SURFACE OF SAID FERRITIC STEEL SUBSTRATE, AND A CATLYTIC MATERIAL SUPPOSED UPON THE CERAMIC LAYER, SAID ALUMINUM BEARING STEEL SUBSTRATE COMPRISING AN ALLOY OF IRON, CHROMIUM, ALUMINUM, AND YTTRIUM, AND HAVING THE PROPERTY OF FORMING AN ALUMINUM LAYER ON HEATING IN AIR, SAID ALUMINA LAYER PROTECTING THE STEEL SUBSTRATE AGAINST FURTHER OXIDATION ATTACH, AND SAID CERAMIC LAYEER COMPRISING A LAYER OF ALUMINA FORMED BY HEATING THE ALUMINUM BEARING FERRIC STEEL SUBSTRATE IN THE PRESENCE OF OXYGEN TO AUSE THE FORMATION OF A LAYER OF ALUMINA ON THE SURFACE OF THE FERRITIC STEEL SUBSTRATE FROM ALUMINUM WITHIN THE FERRITIC STEEL SUBSTRATE THEREBY FORMING A TENACIOUSLY ADHERENT CERAMIC LAYER ON SAID FERRIC STEEL SUBSTRATE.
Claim 3
Dependent Claim
69 words
A catalyst system according to claim 1 wherein said ceramic layer further comprises a layer of ceramic material having a high exposed surface area bonded by a further heat treatment in air to said alumina layer, said heat treatment causing additional alumina from within the ferritic steel substrate to grow into and tenaciously bond to said alumina layer, the layer of ceramic material having a high exposed surface area.
Claim 4
Dependent Claim
13 words
A catalyst system according to claim 1 wherein said catalytic material comprises platinum.
Claim 5
Dependent Claim
28 words
A catalyst system according to claim 1 wherein said catalytic material is deposited on the layer of alumina formed by heating the substrate in the presence of oxygen.
Claim 6
Dependent Claim
28 words
A catalyst system according to claim 1 wherein said steel substrate comprises up to 15% chromium, 0.5 to 12% aluminum, 0.1 to 3% yttrium and the balance iron.
Claim 7
Dependent Claim
14 words
A catalyst system according to claim 1 wherein said steel substrate is finely divided.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |