Patent US4126582A successfully refreshed from Google Patents.
US4126582A
Expired / Lapsed
US
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Manufacture of supported silver catalysts
Assignee: BASF SE
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Filing: 1977-08-15
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Granted: 1978-11-21
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Expires: 1997-08-15
Abstract
Abstract An improved process for the manufacture of silver catalysts, in which the silver is applied to conventional dimensionally stable and chemically inert carriers, eg. alumina or quartz moldings, preferably by electroless deposition from silver salt solutions onto a great variety of surfaces acting as carriers, by the use of suitable reducing agents. In a particular embodiment, a uniform deposition of silver and a dense and well-adhering silver layer on the surface of the carrier are achieved by adding certain materials to the silver salt solutions.
Inventors
- 👤 Hans Diem
- 👤 Christian Dudeck
- 👤 Werner Simmler
- 👤 Siegfried Marquardt
- 👤 Walter Stingl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:36
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/16; B01J23/00; B01J23/38; B01J23/48; B01J23/50; C; C07; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/37; C07C45/38
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
A process for the manufacture of supported silver catalysts in which metallic silver is deposited on a carrier as a dense, well-adhering layer which comprises the steps of: (a) contacting the carrier with a reducing agent wherein said carrier surface has not been subjected to prior activation or sensitization, and (b) treating the carrier from step (a) with a silver salt solution, said solution containing a water-soluble silver salt, ammonium hydroxide and at least one carboxylic acid amino compound of the formula ##STR2## where R, R' and R" are identical or different hydrocarbon radicals or their salts, whereby the silver is deposited by an electroless method in reaction times of from about 1 to 10 minutes.
Claim 2
Dependent Claim
116 words
A process for the manufacture of supported silver catalysts in which metallic silver is deposited on a carrier as a dense, well-adhering layer which comprises the steps of: (a) contacting the carrier with a reducing agent wherein said carrier surface has not been subjected to prior activation or sensitization, and (b) treating the carrier from step (a) with a silver salt solution, said solution containing a water-soluble silver salt, ammonium hydroxide and at least one carboxylic acid amino compound of the formula ##STR2## where R, R' and R" are identical or different hydrocarbon radicals or their salts, whereby the silver is deposited by an electroless method in reaction times of from about 1 to 10 minutes.
Claim 3
Dependent Claim
28 words
A process as set forth in claim 1, in which any chemically inert material which is dimensionally stable at up to 800° C is used as the carrier.
Claim 4
Dependent Claim
21 words
A process as set forth in claim 1, in which hydrazine or a hydrazine derivative is used as the reducing agent.
Claim 5
Dependent Claim
33 words
A process as set forth in claim 1, in which the carboxylic acid amines are used in amounts of from 0.02 to 0.3 mole per gram atom of silver present in the solution.
Claim 6
Dependent Claim
18 words
A process as set forth in claim 1, in which the reducing agents are glucose, formalin or hydroxylamine.
Claim 7
Dependent Claim
19 words
A process as set forth in claim 1, in which the reaction temperature is from 0° to 100° C.
Claim 8
Dependent Claim
19 words
A process as set forth in claim 1, in which the reaction temperature is from 10° to 30° C.
Claim 9
Dependent Claim
17 words
A process as set forth in claim 1, in which the carboxylic acid amine is nitrilotriacetic acid.
Claim 10
Dependent Claim
18 words
A process as set forth in claim 1, in which the reducing agent is added 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) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |