US4613582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making ternary fuel cell catalysts containing platinum cobalt and chromium
Assignee: RTX Corp
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Filing: 1984-01-30
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Granted: 1986-09-23
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Expires: 2004-01-30
Abstract
Abstract An improved ternary noble metal-containing, alloy catalyst which has a catalytic activity for the electrochemical reduction of oxygen greater than two and one-half times that of the supported unalloyed noble metal alone. In addition, a disclosure of the method of preparing said catalyst is by intimately contacting two metallic elements with a supported noble metal, then heating this material to form the ternary alloy catalyst. This catalyst has particular utility for the electrochemical reduction of oxygen which makes it particularly useful as a cathode in acid fuel cells. The preferred embodiment of this catalyst is finely divided platinum alloyed with chromium and cobalt supported on an electrically conductive carbon-black support material.
Inventors
- 👤 Francis J. Luczak
- 👤 Douglas A. Landsman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:35
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/92; H01M4/925; H01M4/926; H01M2004/8678; H01M2004/8689; H01M2300/00; H01M2300/0002; H01M2300/0005; H01M2300/0008; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A method for making a ternary metal alloy catalyst comprising intimately contacting a finely divided noble metal supported on electrically conductive carbon-black with a solution of a compound of an element selected from transition Groups IV, V, VI and VII and a compound of cobalt, heating and reducing the intimately contacted materials in a nitrogen atmosphere to form the catalyst.
Claim 2
Independent Claim
60 words
A method for making a ternary metal alloy catalyst comprising intimately contacting a finely divided noble metal supported on electrically conductive carbon-black with a solution of a compound of an element selected from transition Groups IV, V, VI and VII and a compound of cobalt, heating and reducing the intimately contacted materials in a nitrogen atmosphere to form the catalyst.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein the noble metal is platinum.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the cobalt compound is cobaltous nitrate.
Claim 5
Dependent Claim
10 words
The method of claim 1 wherein the element is chromium.
Claim 6
Dependent Claim
11 words
The method of claim 4 wherein the compound is ammonium chromate.
Claim 7
Independent Claim
85 words
A method for making a supported ternary metal alloy catalyst comprising: dispersing finely divided platinum supported on electrically conductive carbon-black particles in water; preparing separate aqueous solutions of cobalt and chromium compounds; sequentially adding each solution to the platinum-carbon dispersion; adsorbing each compound onto the platinum-carbon-black by intimately contacting them with the particles by stirring, separating the particles then heating and reducing these particles in a nitrogen atmosphere at temperatures from about 815° C. to about 980° C. to form the supported ternary alloy catalyst.
Claim 8
Independent Claim
85 words
A method for making a supported ternary metal alloy catalyst comprising: dispersing finely divided platinum supported on electrically conductive carbon-black particles in water; preparing separate aqueous solutions of cobalt and chromium compounds; sequentially adding each solution to the platinum-carbon dispersion; adsorbing each compound onto the platinum-carbon-black by intimately contacting them with the particles by stirring, separating the particles then heating and reducing these particles in a nitrogen atmosphere at temperatures from about 815° C. to about 980° C. to form the supported ternary alloy catalyst.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |