US4175954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-disintegrating Raney metal alloys
Assignee: United States Department of Energy
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Filing: 1978-07-24
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Granted: 1979-11-27
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Expires: 1998-07-24
Abstract
Abstract A method of preparing a Raney metal alloy which is capable of self-disintegrating when contacted with water vapor. The self-disintegrating property is imparted to the alloy by incorporating into the alloy from 0.4 to 0.8 weight percent carbon. The alloy is useful in forming powder which can be converted to a Raney metal catalyst with increased surface area and catalytic activity.
Inventors
- 👤 Laurance L. Oden
- 👤 James H. Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:41
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/02; C22C1/026
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
71 words
A method of preparing a self-disintegrating Raney metal alloy comprising: (a) heating a mixture which comprises from 29.2 to 50.6 weight percent of at least one catalytically-active metal selected from the group consisting of nickel, cobalt, manganese, iron, copper, and silver, from 0.4 to 0.8 weight percent carbon, and from 49 to 70 weight percent aluminum to form a molten mixture, and (b) cooling the molten mixture to form a solid.
Claim 2
Independent Claim
71 words
A method of preparing a self-disintegrating Raney metal alloy comprising: (a) heating a mixture which comprises from 29.2 to 50.6 weight percent of at least one catalytically-active metal selected from the group consisting of nickel, cobalt, manganese, iron, copper, and silver, from 0.4 to 0.8 weight percent carbon, and from 49 to 70 weight percent aluminum to form a molten mixture, and (b) cooling the molten mixture to form a solid.
Claim 3
Dependent Claim
20 words
A method of preparing a self-disintegrating Raney metal alloy as described in claim 1 wherein said catalytically-active metal is nickel.
Claim 4
Dependent Claim
34 words
A method of preparing a self-disintegrating Raney metal alloy as described in claim 1 wherein said solid is heat-treated at a temperature of from 600° C. to 854° C. for at least two hours.
Claim 5
Dependent Claim
20 words
A method of preparing a self-disintegrating Raney metal alloy as described in claim 3 wherein said catalytically-active metal is nickel.
Claim 6
Independent Claim
102 words
A method of preparing a Raney metal alloy powder comprising: (a) heating a mixture which comprises from 29.2 to 50.6 weight percent of at least one catalytically-active metal selected from the group consisting of nickel, cobalt, manganese, iron, copper, and silver, from 0.4 to 0.8 weight percent carbon, and from 49 to 70 weight percent aluminum to form a molten mixture; (b) cooling the mixture to form a solid; and (c) contacting said solid with water vapor which reacts with the carbide phase within said solid to cause the carbide phase to hydrolyze which cracks and disintegrates the solid into a powder.
Claim 7
Independent Claim
102 words
A method of preparing a Raney metal alloy powder comprising: (a) heating a mixture which comprises from 29.2 to 50.6 weight percent of at least one catalytically-active metal selected from the group consisting of nickel, cobalt, manganese, iron, copper, and silver, from 0.4 to 0.8 weight percent carbon, and from 49 to 70 weight percent aluminum to form a molten mixture; (b) cooling the mixture to form a solid; and (c) contacting said solid with water vapor which reacts with the carbide phase within said solid to cause the carbide phase to hydrolyze which cracks and disintegrates the solid into a powder.
Claim 8
Dependent Claim
20 words
A method of preparing a Raney metal alloy powder as described in claim 7 wherein said catalytically-active metal is nickel.
Claim 9
Dependent Claim
42 words
A method of preparing a Raney metal alloy powder as described in claim 5 wherein said solid is heat-treated at a temperature of from 600° C. to 854° C. for at least two hours prior to contacting said solid with water vapor.
Claim 10
Dependent Claim
32 words
A method of preparing a Raney metal alloy powder as described in claim 7 wherein said solid is maintained at temperature of approximately 100° C. while in contact with the water vapor.
Claim 11
Dependent Claim
40 words
A method of preparing a Raney metal catalyst comprising: (a) contacting the alloy powder prepared in accordance with claim 5 with a caustic solution to leach out the aluminum, and (b) rinsing the resulting Raney metal catalyst powder with water.
Claim 12
Dependent Claim
53 words
A self-disintegrating nickel-aluminum alloy comprising about 49.6 weight percent nickel, about 49.6 weight percent aluminum and about 0.8 weight percent carbon with the nickel, aluminum, and carbon being present in the alloy as an aluminum carbide phase, a Ni 2 Al 3 phase, a NiAl 3 phase and a Al-NiAl 3 eutectic phase.
Claim 13
Dependent Claim
53 words
A self-disintegrating nickel-aluminum alloy comprising about 49.6 weight percent nickel, about 49.6 weight percent aluminum and about 0.8 weight percent carbon with the nickel, aluminum, and carbon being present in the alloy as an aluminum carbide phase, a Ni 2 Al 3 phase, a NiAl 3 phase and a Al-NiAl 3 eutectic phase.
Claim 14
Dependent Claim
48 words
A self-disintegrating nickel-aluminum alloy comprising about 49.6 weight percent nickel, about 49.6 weight percent aluminum and about 0.8 weight percent carbon with the nickel, aluminum, and carbon being present in the alloy as an aluminum carbide phase, a Ni 2 Al 3 phase and a NiAl 3 phase.
Claim 15
Dependent Claim
48 words
A self-disintegrating nickel-aluminum alloy comprising about 49.6 weight percent nickel, about 49.6 weight percent aluminum and about 0.8 weight percent carbon with the nickel, aluminum, and carbon being present in the alloy as an aluminum carbide phase, a Ni 2 Al 3 phase and a NiAl 3 phase.
References Cited (Backward Citations)
US3627790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |