US3944504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for the diminution of automobile exhaust gases
Assignee: Olin Corp
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Filing: 1975-01-20
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Granted: 1976-03-16
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Expires: 1995-01-20
Abstract
Abstract A catalyst for the diminution of automobile pollution and a method for forming the catalyst are described. The catalyst comprises a metal alloy substrate having a specified composition, an oxide layer containing a large proportion of alumina on the surface of the alloy and a surface layer comprising from 60 to 100% platinum and from 0 to 40% palladium.
Inventors
- 👤 James A. Ford
- 👤 Sheldon H. Butt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:46
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J; B01J23/00; B01J23/70; B01J23/89; B01J23/892; B01J35/00; B01J35/30; B01J35/391; B01J35/395; B01J35/34; B01J35/36
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
160 words
A process for producing a catalyst for the removal of carbon monoxide and hydrocarbons from automobile exhaust gases comprising the steps of: A. providing a substrate of a nickel base single-phase alloy comprising in solid solution 2 to 6% by weight aluminum and balance of 50 to 98% essentially of nickel, said alloy being capable of forming an adherent oxide layer mainly of aluminum oxide; B. oxidizing the substrate alloy to produce the adherent alumina-rich layer at a temperature of from 350° to 1,000°F for a time of from 1 minute to 20 hours, said layer having a thickness of from 100 to 10,000 A; and C. applying a layer of metal to the surface of the oxide layer, said layer having a thickness from 100 to 5,000 A and containing from .001 to 40% palladium, from 0.001 to 20% of a metal chosen from the group consisting of iridium, rhenium, osmium, ruthenium, and mixtures thereof, and balance essentially platinum.
Claim 2
Dependent Claim
160 words
A process for producing a catalyst for the removal of carbon monoxide and hydrocarbons from automobile exhaust gases comprising the steps of: A. providing a substrate of a nickel base single-phase alloy comprising in solid solution 2 to 6% by weight aluminum and balance of 50 to 98% essentially of nickel, said alloy being capable of forming an adherent oxide layer mainly of aluminum oxide; B. oxidizing the substrate alloy to produce the adherent alumina-rich layer at a temperature of from 350° to 1,000°F for a time of from 1 minute to 20 hours, said layer having a thickness of from 100 to 10,000 A; and C. applying a layer of metal to the surface of the oxide layer, said layer having a thickness from 100 to 5,000 A and containing from .001 to 40% palladium, from 0.001 to 20% of a metal chosen from the group consisting of iridium, rhenium, osmium, ruthenium, and mixtures thereof, and balance essentially platinum.
Claim 3
Dependent Claim
19 words
A process as in claim 1 wherein the thickness of the oxide layer is from 200 to 5,000 A.
Claim 4
Dependent Claim
20 words
A process as in claim 1 wherein the oxidation step is performed at a temperature of from 500° to 900°C.
Claim 5
Dependent Claim
15 words
A process as in claim 1 wherein the metal layer contains up to 20% palladium.
Claim 6
Dependent Claim
29 words
A process as in claim 1 wherein the metal contains up to 5% of a metal chosen from the group consisting of iridium, rhenium, osmium, ruthenium, and mixtures thereof.
Claim 7
Dependent Claim
27 words
A process as in claim 1 wherein the substrate alloy contains 2 to 6% aluminum, 0.5 to 4.0% silicon, 0.001 to 6.0% chromium, and balance essentially nickel.
Claim 8
Dependent Claim
15 words
A process as in claim 6 wherein the substrate alloy contains 0.001 to 1.0% magnesium.
Claim 9
Dependent Claim
18 words
A process as in claim 1 wherein the substrate alloy contains 4.5% aluminum, 3% silicon, and 2% chromium.
Claim 10
Dependent Claim
136 words
A catalyst for the diminution of automobile exhaust gases comprising: A. a substrate alloy containing in solid solution 2 to 6% aluminum and balance of 50 to 98% essentially of nickel, said alloy being capable of forming an adherent oxide layer mainly of alumina; B. an adherent alumina-rich layer formed on the surface of the substrate alloy by oxidation at 350° to 1,000°F for a time of 1 minute to 20 hours, said layer having a thickness of from 200 to 5,000 A; and C. a layer of metal on the surface of the oxide layer having a thickness of from 200 to 2,000 A and containing from 0.001 to 40% palladium, from 0.001 to 20% of a metal chosen from the group consisting of iridium, rhenium, osmium, ruthenium, and mixtures thereof, and balance essentially platinum.
Claim 11
Dependent Claim
136 words
A catalyst for the diminution of automobile exhaust gases comprising: A. a substrate alloy containing in solid solution 2 to 6% aluminum and balance of 50 to 98% essentially of nickel, said alloy being capable of forming an adherent oxide layer mainly of alumina; B. an adherent alumina-rich layer formed on the surface of the substrate alloy by oxidation at 350° to 1,000°F for a time of 1 minute to 20 hours, said layer having a thickness of from 200 to 5,000 A; and C. a layer of metal on the surface of the oxide layer having a thickness of from 200 to 2,000 A and containing from 0.001 to 40% palladium, from 0.001 to 20% of a metal chosen from the group consisting of iridium, rhenium, osmium, ruthenium, and mixtures thereof, and balance essentially platinum.
Claim 12
Dependent Claim
29 words
A catalyst as in claim 9 wherein the substrate is an alloy containing 2 to 6% aluminum, 0.5 to 4.0% silicon, 0.001 to 6.0% chromium, and balance essentially nickel.
Claim 13
Dependent Claim
29 words
A catalyst as in claim 9 wherein the substrate is an alloy containing 3 to 5% aluminum, 2 to 3.5% silicon, 3 to 5% chromium, and balance essentially nickel.
Claim 14
Dependent Claim
15 words
A catalyst as in claim 9 wherein the substrate alloy contains 0.001 to 1.0% magnesium.
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) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |