US4120824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetravalent manganese-carbon oxidation catalysts and methods of their preparation
Assignee: Zeneca Inc
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Filing: 1977-04-18
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Granted: 1978-10-17
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Expires: 1997-04-18
Abstract
Abstract Tetravalent manganese precipitated on porous carbon provide useful oxidation catalysts. They may be prepared by slurrying potassium permanganate and porous carbon under alkaline conditions.
Inventors
- 👤 Walter M. Kruse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:36
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/44; B; B01; B01J; B01J23/00; B01J23/16; B01J23/32; B01J23/34; C07; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/37; C07C45/38; C07C45/39; C07C46/00; C07C46/02; C07C46/06; C07C46/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
27 words
A heterogeneous oxidation catalyst consisting essentially of about 1 to 10% by weight of tetravalent manganese precipitated on porous carbon which is substantially free of mineral impurities.
Claim 2
Dependent Claim
27 words
A heterogeneous oxidation catalyst consisting essentially of about 1 to 10% by weight of tetravalent manganese precipitated on porous carbon which is substantially free of mineral impurities.
Claim 3
Dependent Claim
22 words
A catalyst as claimed in claim 1 wherein the porous carbon has a surface area of at least 500 m 2 /grams.
Claim 4
Dependent Claim
47 words
A method of preparing a catalyst as claimed in claim 1 which comprises slurry a aqueous solution of a permanganate salt with a porous carbon substantially free of mineral impurities and subsequent thereto drying the slurry at temperatures of below 25° C. to obtain a solid catalyst.
Claim 5
Dependent Claim
16 words
A method as claimed in claim 3 wherein the permanganate salt is an alkali permanganate salt.
Claim 6
Dependent Claim
14 words
A method as claimed in claim 4 wherein the permanganate salt is potassium permanganate.
Claim 7
Dependent Claim
15 words
A method as claimed in claim 3 wherein the drying is accomplished by vacuum drying.
Claim 8
Dependent Claim
15 words
A method as claimed in claim 3 wherein the drying is accomplished by freeze drying.
References Cited (Backward Citations)
FR1329505A
Cited
US2055475A
Cited
US3434479A
Cited
US3541025A
Cited
US3700605A
Cited
US3884830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |