Patent US4090978A successfully refreshed from Google Patents.
US4090978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrocatalysts and a method for the preparation thereof
Assignee: Honeywell UOP LLC
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Filing: 1976-12-28
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Granted: 1978-05-23
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Expires: 1996-12-28
Abstract
Abstract Electrocatalysts which may be used in the preparation of electrodes for electrochemical cells such as fuel cells comprise a carbonaceous pyropolymer having the surface thereof impregnated with at least one catalytically active metal. The electrocatalysts may be prepared by treating a refractory inorganic oxide with a pyrolyzable organic compound at pyrolysis conditions to form a carbonaceous pyropolymer on the surface of said refractory inorganic oxide. Thereafter the composite may be impregnated with a soluble salt of at least one catalytically active metal and thereafter the composite may be leached to remove the refractory inorganic oxide. Alternatively, the composite may be leached to remove the refractory inorganic oxide prior to impregnation with the catalytically active metal.
Inventors
- 👤 Lawrence B. Welsh
- 👤 Richard W. Leyerle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:19
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/06; B01J23/00; B01J23/38; B01J23/40; H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
135 words
An electrocatalyst which may be used in the preparation of an electrode for an electrochemical cell prepared by the steps which comprises: (a) treating a refractory inorganic oxide having a surface area from 1 to 500 square meters per gram with an organic pyrolyzable compound in a reducing atmosphere at a temperature of from about 400° to about 1200° C to pyrolyze said organic compound to form a carbonaceous pyropolymer having a conductivity at room temperature of from about 10 -8 to 10 2 inverse ohm-centimeters on the surface of said refractory inorganic oxide; (b) leaching said carbonaceous pyropolymer depositedrefractory inorganic oxide with an acid or base to remove said refractory inorganic oxide; (c) impregnating the remaining carbonaceous pyropolymer with a soluble salt of at least one catalytically active metal; and (d) recovering said electrocatalyst.
Claim 2
Dependent Claim
135 words
An electrocatalyst which may be used in the preparation of an electrode for an electrochemical cell prepared by the steps which comprises: (a) treating a refractory inorganic oxide having a surface area from 1 to 500 square meters per gram with an organic pyrolyzable compound in a reducing atmosphere at a temperature of from about 400° to about 1200° C to pyrolyze said organic compound to form a carbonaceous pyropolymer having a conductivity at room temperature of from about 10 -8 to 10 2 inverse ohm-centimeters on the surface of said refractory inorganic oxide; (b) leaching said carbonaceous pyropolymer depositedrefractory inorganic oxide with an acid or base to remove said refractory inorganic oxide; (c) impregnating the remaining carbonaceous pyropolymer with a soluble salt of at least one catalytically active metal; and (d) recovering said electrocatalyst.
Claim 3
Dependent Claim
35 words
The catalytic composition of matter of claim 1 in which said catalytically active metal is present in said composite in a range of from about 5% to about 50% by weight of the carbonaceous pyropolymer.
Claim 4
Dependent Claim
16 words
The catalytic composition of matter of claim 1 in which said catalytically active metal is platinum.
Claim 5
Dependent Claim
16 words
The catalytic composition of matter of claim 1 in which said catalytically active metal is palladium.
Claim 6
Dependent Claim
18 words
The catalytic composition of matter of claim 1 in which said catalytically active metals are platinum and rhenium.
Claim 7
Dependent Claim
18 words
The catalytic composition of matter of claim 1 in which said catalytically active metals are platinum and rhodium.
Claim 8
Dependent Claim
18 words
The catalytic composition of matter of claim 1 in which said catalytically active metals are palladium and ruthenium.
Claim 9
Dependent Claim
20 words
The catalytic composition of matter prepared by the steps of claim 1 in which said refractory inorganic oxide is alumina.
Claim 10
Dependent Claim
20 words
The catalytic composition of matter prepared by the steps of claim 1 in which said refractory inorganic oxide is silica.
Claim 11
Dependent Claim
32 words
The catalytic composition of matter prepared by the steps of claim 1 in which said leaching is effected at a temperature in the range of from about ambient to about 250° C.
Claim 12
Dependent Claim
25 words
The catalytic composition of matter prepared by the steps of claim 1 in which said refractory inorganic oxide is leached by treatment with phosphoric acid.
Claim 13
Dependent Claim
25 words
The catalytic composition of matter prepared by the steps of claim 1 in which said refractory inorganic oxide is leached by treatment with sulfuric acid.
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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) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |