US4132673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of a catalyst
Assignee: Riken Keiki KK
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Filing: 1977-02-10
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Granted: 1979-01-02
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Expires: 1997-02-10
Abstract
Abstract A process for the preparation of a catalyst comprises abrading a solid metallic material selected from platinum, palladium, platinum-palladium alloys and mixtures thereof, in the presence of an aqueous alumina suspension to obtain a suspension which contains finely divided particles of the metallic material and the alumina uniformly dispersed throughout, applying the thus obtained suspension to a support, and then removing the water therefrom to obtain the desired catalyst.
Inventors
- 👤 Shigeto Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:16
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; G; G03; G03G; G03G2221/00; G03G2221/0005
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
A process for the preparation of a catalyst comprises abrading a metallic material selected from platinum, palladium, platinum-palladium alloys and mixtures thereof, in the presence of an aqueous alumina suspension to obtain an aqueous suspension which contains finely divided particles of the metallic material and alumina uniformly dispersed therethrough, applying the thus obtained suspension to a support and then removing the water therefrom to obtain the catalyst.
Claim 2
Dependent Claim
67 words
A process for the preparation of a catalyst comprises abrading a metallic material selected from platinum, palladium, platinum-palladium alloys and mixtures thereof, in the presence of an aqueous alumina suspension to obtain an aqueous suspension which contains finely divided particles of the metallic material and alumina uniformly dispersed therethrough, applying the thus obtained suspension to a support and then removing the water therefrom to obtain the catalyst.
Claim 3
Dependent Claim
12 words
The process of claim 1 in which the metallic material is platinum.
Claim 4
Dependent Claim
12 words
The process of claim 1 in which the metallic material is palladium.
Claim 5
Dependent Claim
15 words
The process of claim 1 in which the metallic material is a platinum-palladium metal alloy.
Claim 6
Dependent Claim
29 words
The process of claim 1 in which the suspension is applied to the support by coating the support and after the water is removed the coated support is sintered.
Claim 7
Dependent Claim
28 words
The process of claim 1 in which the suspension is applied to the support by impregnating the support with the suspension and the water is removed by drying.
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) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |