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US4956331A
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US
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Process for producing metal supported catalyst having high surface area
Assignee: Tanaka Precious Metal Technologies Co Ltd
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Filing: 1989-02-17
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Granted: 1990-09-11
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Expires: 2009-02-17
Abstract
Abstract Disclosed herein is a process for reducing metal salts in which catalyst metal containing ions are reduced to the corresponding metals with a reducing agent which contains a sulfur atom and is relatively weak in reducing ability such as sodium thiosulfate, potassium thiosulfate, ammonium thiosulfate, sodium metabisulfite, potassium metabisulfite and ammonium metabisulfite. Since the reducing agent is weak, the size of the catalyst metals supported on the supports is small to enhance the catalytic activity.
Inventors
- 👤 Kazunori Tsurumi
- 👤 Toshihide Nakamura
- 👤 Akira Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:50
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J37/00; B01J37/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
A process for producing a metal supported catalyst having a large surface area comprising: reducing one or more metal containing ions in a solution to a corresponding metal or metals employing a solution of one or more reducing agents selected from the group consisting of sodium thiosulfate, potassium thiosulfate, ammonium thiosulfate, sodium metabisulfite, potassium metabisulfite and ammonium metabisulfite; the solution of reducing agent being initially added dropwise and all at once thereafter to assure the formation of nuclei for forming finely-divided catalyst particles; and supporting the reduced metal or metals having a large surface area onto supports.
Claim 2
Dependent Claim
97 words
A process for producing a metal supported catalyst having a large surface area comprising: reducing one or more metal containing ions in a solution to a corresponding metal or metals employing a solution of one or more reducing agents selected from the group consisting of sodium thiosulfate, potassium thiosulfate, ammonium thiosulfate, sodium metabisulfite, potassium metabisulfite and ammonium metabisulfite; the solution of reducing agent being initially added dropwise and all at once thereafter to assure the formation of nuclei for forming finely-divided catalyst particles; and supporting the reduced metal or metals having a large surface area onto supports.
Claim 3
Dependent Claim
13 words
A process as defined in claim 1, wherein the supports are carbon supports.
Claim 4
Dependent Claim
14 words
A process as defined in claim 1, wherein the supports are inorganic oxide supports.
Claim 5
Dependent Claim
22 words
A process as defined in claim 1, wherein the metal or metals contained in the metal containing ions are platinum and/or palladium.
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) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |