Patent US4049582A successfully refreshed from Google Patents.
US4049582A
Expired / Lapsed
US
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Method for producing a supported catalyst
Assignee: Atlantic Richfield Co
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Filing: 1976-03-25
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Granted: 1977-09-20
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Expires: 1996-03-25
Abstract
Abstract Improved methods for reducing the amounts of hydrocarbon, carbon monoxide and nitrogen oxides in the exhaust gases of internal combustion engines involving the use of catalysts comprising a major amount of crystalline magnesium aluminate spinel. Improved catalysts as well as improved methods for making the present catalyst are also included.
Inventors
- 👤 Henry Erickson
- 👤 John Mooi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:03
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J21/00; B01J21/005; F; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S502/00; Y10S502/524
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
233 words
A method for producing a supported metal-containing catalyst comprising a first magnesium alumina spinel support, and disposed as a coating on said first magnesium aluminate spinel support, a mixture comprising second magnesium aluminate spinel and at least one catalytically active metal component sufficient to promote at least one of the following: (a) the oxidation of at least a portion of the hydrocarbon and carbon monoxide contained in the exhaust gases of an internal combustion engine and (b) the chemical reduction of at least a portion of the nitrogen oxides contained in the exhaust gases of an internal combustion engine, said metal being less basic than magnesium, which comprises: 1. forming an aqueous slurry comprising magnesium aluminate spinel precursor, and at least one compound of said metal, said precursor being derived from contacting in an aqueous medium a soluble inorganic magnesium salt and a soluble salt having aluminum in the anion to precipitate a first spinel precursor, the amount of water in said slurry being such as to allow said slurry to be applied to said support as a film of desired uniformity and thickness; 2. contacting said support with said aqueous slurry to form a coated support including a metal-containing film of desired thickness and uniformity on said support; and 3. treating said coated support at a temperature and for a time sufficient to calcine said material and form said supported metal-containing catalyst.
Claim 2
Independent Claim
233 words
A method for producing a supported metal-containing catalyst comprising a first magnesium alumina spinel support, and disposed as a coating on said first magnesium aluminate spinel support, a mixture comprising second magnesium aluminate spinel and at least one catalytically active metal component sufficient to promote at least one of the following: (a) the oxidation of at least a portion of the hydrocarbon and carbon monoxide contained in the exhaust gases of an internal combustion engine and (b) the chemical reduction of at least a portion of the nitrogen oxides contained in the exhaust gases of an internal combustion engine, said metal being less basic than magnesium, which comprises: 1. forming an aqueous slurry comprising magnesium aluminate spinel precursor, and at least one compound of said metal, said precursor being derived from contacting in an aqueous medium a soluble inorganic magnesium salt and a soluble salt having aluminum in the anion to precipitate a first spinel precursor, the amount of water in said slurry being such as to allow said slurry to be applied to said support as a film of desired uniformity and thickness; 2. contacting said support with said aqueous slurry to form a coated support including a metal-containing film of desired thickness and uniformity on said support; and 3. treating said coated support at a temperature and for a time sufficient to calcine said material and form said supported metal-containing catalyst.
Claim 3
Dependent Claim
36 words
The method of claim 1 wherein said metal is selected from the group consisting of Group IB metal, Group IV metal, Group V metal, Group VI metal, Group VII metal, Group VIII metal and mixtures thereof.
Claim 4
Dependent Claim
52 words
The method of claim 2 wherein the ratio of said spinel precursor to said metal compound in said aqueous slurry is in the range from about 1000:1 to about 1:1 and the amount of water in said aqueous slurry ranges from about 50% to about 99% by weight of the total slurry.
Claim 5
Dependent Claim
36 words
The method of claim 3 wherein step (3) is carried out at a temperature in the range from about 800° F. to about 2000° F. for a time from about one-half hour to about 10 hours.
Claim 6
Dependent Claim
36 words
The method of claim 4 wherein said metal is selected from the group consisting of Group IB metal, Group IV metal, Group V metal, Group VI metal, Group VII metal, Group VIII metal and mixtures thereof.
Claim 7
Dependent Claim
21 words
The method of claim 3 wherein said metal is selected from the group consisting of platinum group metal and mixtures thereof.
Claim 8
Dependent Claim
22 words
The method of claim 6 wherein said metal is selected from the group consisting of platinum and mixtures of platinum and palladium.
References Cited (Backward Citations)
US2071119A
Cited
US3791992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |