US3663166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Platinum catalyst for the production of hydroxylamine
Assignee: Bayer AG
•
Filing: 1970-07-30
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Granted: 1972-05-16
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Expires: 1990-07-30
Abstract
Abstract Improved platinum catalyst with high life period, activity and selectivity for the production of hydroxylammonium salts by the reduction of nitric oxide with hydrogen, the catalyst being obtained by hydrolyzing the water soluble platinum compound at a pH of 4.5 to 9.0 and at a temperature of 20* to 100* C. in the presence of a carrier which is insoluble in strong acids, thereby precipitating platinum oxide hydrate onto said carrier in finely divided form and thereafter reducing the platinum oxide hydrate to metallic platinum.
Inventors
- 👤 Johannes Weise
- 👤 Hans Zirngibl
- 👤 Heinz Heine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:27
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; C; C01; C01B; C01B21/00; C01B21/082; C01B21/14; C01B21/1409; C01B21/1418
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
34 words
Process according to claim 1 wherein the water soluble platinum compound is a member selected from the group consisting of hexachloro platinic acid, tetrachloro platinous acid and the potassium salts of tetrachloro platinous acid.
Claim 2
Dependent Claim
31 words
Process according to claim 1 wherein the hydrolyzing is carried out at a pH of from about 6.0 to 7.0 and at a temperature of from about 70* to 100* C.
Claim 3
Dependent Claim
22 words
Process according to claim 1 wherein the reduction of the platinum oxide hydrate is carried out with hydrogen in sulfuric acid solution.
Claim 4
Dependent Claim
21 words
Process according to claim 1 wherein the reduction of the platinum catalyst is carried out with formic acid in aqueous solution.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |