Patent US4471071A successfully refreshed from Google Patents.
US4471071A
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Silver catalysts, and a process for their preparation
Assignee: Clariant Produkte Deutschland GmbH
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Filing: 1983-06-02
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Granted: 1984-09-11
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Expires: 2003-06-02
Abstract
Abstract A method for making a silver catalyst by applying a promoter and a complex formed between a silver salt and a mixture of a tert.-alkyl amine and a sec.-alkyl amine to a heat resistant porous support and then thermally decomposing said complex to metallic silver.
Inventors
- 👤 Siegfried Rebsdat
- 👤 Sigmund Mayer
- 👤 Josef Alfranseder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:19
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/04; C07D301/08; C07D301/10; B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/66; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
164 words
A method for making a silver catalyst consisting of a heat resistant porous support material having thereon from 3 to 20 percent of silver and from 0.003 to 0.05 percent of a promoter which is a compound of potassium, rubidium, cesium, or a mixture thereof, said percentages being by weight of the finished catalyst, which method comprises impregnating said support material with said promoter compound and with a complex formed between a silver salt and an amine mixture comprising from 10 to 40 percent by weight of at least one tert.-alkyl amine of the formula ##STR8## and from 60 to 90 percent by weight of at least one sec.-alkyl amine of the formula ##STR9## wherein R 1 , R 2 , R 3 , R 4 , and R 5 are each alkyl having 1 to 4 carbon atoms, and then drying and heating the impregnated support material at a temperature from 70° C. to 400° C. to decompose said complex into metallic silver.
Claim 2
Independent Claim
164 words
A method for making a silver catalyst consisting of a heat resistant porous support material having thereon from 3 to 20 percent of silver and from 0.003 to 0.05 percent of a promoter which is a compound of potassium, rubidium, cesium, or a mixture thereof, said percentages being by weight of the finished catalyst, which method comprises impregnating said support material with said promoter compound and with a complex formed between a silver salt and an amine mixture comprising from 10 to 40 percent by weight of at least one tert.-alkyl amine of the formula ##STR8## and from 60 to 90 percent by weight of at least one sec.-alkyl amine of the formula ##STR9## wherein R 1 , R 2 , R 3 , R 4 , and R 5 are each alkyl having 1 to 4 carbon atoms, and then drying and heating the impregnated support material at a temperature from 70° C. to 400° C. to decompose said complex into metallic silver.
Claim 3
Dependent Claim
14 words
A method as in claim 1 wherein said amine mixture comprises tert.-butylamine and sec.-butylamine.
Claim 4
Dependent Claim
30 words
A method as in claim 1 wherein said catalyst contains from 7 to 14 percent by weight of silver and from 0.008 to 0.035 percent by weight of said promoter.
Claim 5
Dependent Claim
11 words
A method as in claim 1 wherein said promoter is cesium.
Claim 6
Dependent Claim
10 words
A silver catalyst prepared by the method of claim 1.
Claim 7
Dependent Claim
10 words
A silver catalyst prepared by the method of claim 2.
Claim 8
Dependent Claim
10 words
A silver catalyst prepared by the method of claim 3.
Claim 9
Dependent Claim
10 words
A silver catalyst prepared by the method of claim 4.
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) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |