US4414182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing hydrogen
Assignee: Hitachi Ltd
•
Filing: 1982-02-02
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Granted: 1983-11-08
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Expires: 2002-02-02
Abstract
Abstract Hydrogen is generated by contacting an alkaline aqueous solution of formaldehyde with at least one catalyst selected from the group consisting of molybdenum, tungsten, molybdenum carbides, tungsten carbides, molybdenum nitrides, tungstenum borides, copper, silver, gold and compounds of copper, silver and gold. Hydrogen can be generated at ambient temperature under atmospheric pressure and, therefore, complicated steps or complicated devices are unnecessary.
Inventors
- 👤 Hiroshi Okamoto
- 👤 Tetsuichi Kudo
- 👤 Go Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:53
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/22; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/36
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
51 words
A process for generating hydrogen from an alkaline aqueous solution of formaldehyde wherein the solution is contacted with at least one catalyst selected from the group consisting of molybdenum, tungsten, molybdenum carbides, tungsten carbides, tungsten molybdenum carbides, molybdenum nitrides, and tungsten borides to catalyze the generation of hydrogen from said solution.
Claim 2
Dependent Claim
51 words
A process for generating hydrogen from an alkaline aqueous solution of formaldehyde wherein the solution is contacted with at least one catalyst selected from the group consisting of molybdenum, tungsten, molybdenum carbides, tungsten carbides, tungsten molybdenum carbides, molybdenum nitrides, and tungsten borides to catalyze the generation of hydrogen from said solution.
Claim 3
Dependent Claim
25 words
A process according to claim 1 wherein the alkaline aqueous solution of formaldehyde contains at least about 0.3 mol/l of potassium hydroxide or sodium hydroxide.
Claim 4
Dependent Claim
15 words
A process according to claim 2 wherein formaldehyde concentration is at least about 0.1 mol/l.
Claim 5
Dependent Claim
14 words
A process according to claim 1, wherein said at least one catalyst is WC.
References Cited (Backward Citations)
US2414120A
Cited
JPS49101319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |