US4431567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing electrodes using precious metal-catalyst containing partially fluorinated active carbon
Assignee: Diamond Shamrock Chemicals Co
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Filing: 1982-02-22
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Granted: 1984-02-14
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Expires: 2002-02-22
Abstract
Abstract This disclosure is directed to preparing deashed, precious metal catalyst-containing, partially fluorinated active carbon particles of the formula CFx, where x ranges from 0.l to about 0.18, preferably using either platinum or silver as the catalyzing material, which can be incorporated into an active layer component of a gas electrode, e.g., an oxygen (air) cathode suitable for use in a chlor-alkali electrolytic cell for producing chlorine and caustic while conserving electrical energy. These particles are deashed to have a B.E.T. surface area of at least 600 m2/g and contain less than about 4 weight percent ash. Active electrode layers containing such particles demonstrate an unusually desirable combination of resistance to corrosion, retention of conductive properties and retention of catalytic surface area.
Inventors
- 👤 Lawrence J. Gestaut
- 👤 Frank Solomon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:34
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/88; H01M4/8875; B; B01; B01J; B01J27/00; B01J27/06; B01J27/08; B01J27/12; B01J31/00; B01J31/02; B01J31/06; B01J33/00; C; C01; C01B; C01B32/00; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/095; H01M4/8663; H01M4/8668; H01M4/90; H01M4/92; C01P; C01P2006/00; C01P2006/12; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
68 words
A method of preparing active carbon catalyst particles comprising depositing precious metal catalyst on partially fluorinated active carbon particles of the formula CF x , where x=0.1 to about 0.18, and having an ash content of less than about 4 weight percent and a B.E.T. surface area of at least 600 m 2 /g and discontinuously coating said partially fluorinated active carbon particles with smaller adherent polytetrafluoroethylene particles.
Claim 2
Independent Claim
68 words
A method of preparing active carbon catalyst particles comprising depositing precious metal catalyst on partially fluorinated active carbon particles of the formula CF x , where x=0.1 to about 0.18, and having an ash content of less than about 4 weight percent and a B.E.T. surface area of at least 600 m 2 /g and discontinuously coating said partially fluorinated active carbon particles with smaller adherent polytetrafluoroethylene particles.
Claim 3
Dependent Claim
12 words
A method as in claim 1 wherein said precious metal is platinum.
Claim 4
Dependent Claim
12 words
A method as in claim 1 wherein said precious metal is silver.
Claim 5
Independent Claim
92 words
A method for preparing an electrode active layer comprising depositing a precious metal catalyst on partially fluorinated active carbon particles of the formula CF x , where x=0.1 to about 0.18 and having an ash content of less than about 4 weight percent and a B.E.T. surface area of at least 600 m 2 /g, discontinuously coating said particles with smaller adherent polytetrafluoroethylene particles, and combining said discontinuously coated particles with an intimate mix of carbon black particles and polytetrafluoroethylene particles and particulate pore-forming agent, and forming said mix into a sheet.
Claim 6
Independent Claim
92 words
A method for preparing an electrode active layer comprising depositing a precious metal catalyst on partially fluorinated active carbon particles of the formula CF x , where x=0.1 to about 0.18 and having an ash content of less than about 4 weight percent and a B.E.T. surface area of at least 600 m 2 /g, discontinuously coating said particles with smaller adherent polytetrafluoroethylene particles, and combining said discontinuously coated particles with an intimate mix of carbon black particles and polytetrafluoroethylene particles and particulate pore-forming agent, and forming said mix into a sheet.
Claim 7
Dependent Claim
12 words
A process as in claim 4 wherein said precious metal is platinum.
Claim 8
Dependent Claim
12 words
A process as in claim 4 wherein said precious metal is silver.
Claim 9
Dependent Claim
23 words
A process as in claim 4 wherein said active carbon particles have a particle size ranging from about 5 to about 20 microns.
Claim 10
Dependent Claim
14 words
A process as in claim 4 wherein said carbon black is acetylene carbon black.
Claim 11
Dependent Claim
13 words
A process as in claim 4 wherein said pore-former is a soluble pore-former.
Claim 12
Dependent Claim
12 words
A process as in claim 9 wherein said pore-former is sodium carbonate.
Claim 13
Dependent Claim
13 words
A process as in claim 4 wherein said pore-former is a volatile pore-former.
Claim 14
Dependent Claim
12 words
A process as in claim 11 wherein said pore-former is ammonium benzoate.
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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) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |