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US 3,944,504 AGranted
Catalyst for the diminution of automobile exhaust gases
AssigneeOlin Corporation
InventorsJames A. Ford, Sheldon H. Butt
Life of this patent
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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.
Claims12
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.degree. to 1,000.degree.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.
1 more element
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.degree. to 1,000.degree.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.
1 more element
Dependencies are inferred from the claim text.