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US4049580A
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US
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Method for producing supported Raney nickel catalyst
Assignee: United States Department of the Interior
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Filing: 1976-07-23
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Granted: 1977-09-20
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Expires: 1996-07-23
Abstract
Abstract A method for making a supported Raney nickel catalyst by coating a nickel substrate with aluminum or aluminum-nickel alloy, heat treating the coated substrate above the melting point of aluminum but below 1133 DEG C, quenching at a temperature below 854 DEG C to form NiAl3 as a solid phase in the substrate. The Raney nickel alloy coating is activated in the usual manner by leaching with sodium hydroxide solution.
Inventors
- 👤 Laurance L. Oden
- 👤 Philip E. Sanker
- 👤 James H. Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:03
CPC Classifications
B; B01; B01J; B01J25/00; B01J25/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
113 words
A process for making a Raney nickel catalyst comprising: dipping a nickel support or substrate into a bath comprising molten aluminum; removing the support from the bath of molten aluminum, the said support now being coated with a layer of aluminum to form a specimen; heat treating the specimen in the absence of oxygen at a temperature of from about 700° to 1133° C.; and quenching the heat treated specimen at a temperature of from about 640° to 854° C. in the absence of oxygen to form NiAl 3 as a solid phase coating on the substrate; and leaching the coated substrate with sodium hydroxide solution to produce a supported Raney nickel catalyst.
Claim 2
Dependent Claim
113 words
A process for making a Raney nickel catalyst comprising: dipping a nickel support or substrate into a bath comprising molten aluminum; removing the support from the bath of molten aluminum, the said support now being coated with a layer of aluminum to form a specimen; heat treating the specimen in the absence of oxygen at a temperature of from about 700° to 1133° C.; and quenching the heat treated specimen at a temperature of from about 640° to 854° C. in the absence of oxygen to form NiAl 3 as a solid phase coating on the substrate; and leaching the coated substrate with sodium hydroxide solution to produce a supported Raney nickel catalyst.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the aluminum contains up to 30 percent by weight of nickel.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein the nickel support or substrate is formed by joining a nickel screen to at least one side of a nickel sheet.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein the nickel support or substrate is formed by indenting or perforating a nickel sheet.
Claim 6
Dependent Claim
135 words
The process for making a supported Raney nickel catalyst comprising the steps of: preheating a nickel support or substrate at from about 700° C. to about 1133° C. in a first molten salt bath; immersing said support in a bath comprising molten aluminum maintained at substantially the same temperature as the first salt bath; removing the support from said first molten salt bath whereby a continuous coating of aluminum on said support is obtained forming a specimen; heat treating the specimen in the said first salt bath; quenching the specimen in a second molten salt bath at a temperature of from about 640° C. to 854° C. to form NiAl 3 as a solid phase coating on the support; and leaching the coated support with sodium hydroxide solution to produce a supported Raney nickel catalyst.
Claim 7
Dependent Claim
135 words
The process for making a supported Raney nickel catalyst comprising the steps of: preheating a nickel support or substrate at from about 700° C. to about 1133° C. in a first molten salt bath; immersing said support in a bath comprising molten aluminum maintained at substantially the same temperature as the first salt bath; removing the support from said first molten salt bath whereby a continuous coating of aluminum on said support is obtained forming a specimen; heat treating the specimen in the said first salt bath; quenching the specimen in a second molten salt bath at a temperature of from about 640° C. to 854° C. to form NiAl 3 as a solid phase coating on the support; and leaching the coated support with sodium hydroxide solution to produce a supported Raney nickel catalyst.
Claim 8
Dependent Claim
17 words
The process of claim 5 wherein the aluminum contains up to 30 percent by weight of nickel.
Claim 9
Dependent Claim
74 words
The process of claim 5 wherein the nickel support is immersed in the molten aluminum bath for from 1 to 15 seconds, the temperature of the first molten salt bath is from about 700° C. to 1050° C., and the heat treatment time is from 21/2 to about 30 seconds; and wherein the higher the temperature of the molten aluminum and the salt bath the shorter is the immersion and the treatment time, respectively.
Claim 10
Dependent Claim
16 words
The method of claim 7 wherein temperature of the first molten salt bath is 1050° C.
Claim 11
Dependent Claim
40 words
The method of claim 7 wherein the first molten salt bath has the composition in weight percent of 50% cryolite, 25% NaCl and 25% LiF and the second molten salt bath has the composition 65.5% CaCl 2 , 34.5% NaCl.
Claim 12
Dependent Claim
22 words
The method of claim 9 wherein the first molten salt bath has the composition in weight percent of 92% cryolite, 8% LiF.
Claim 13
Dependent Claim
92 words
The process of claim 5 which comprises: first forming a pool of molten aluminum within the first molten salt bath, so that said aluminum forms a layer below said salt bath; and thereafter performing the preheating step by immersing the nickel support in the first molten salt bath; and performing the coating step by immersing the substrate in the molten aluminum by lowering said substrate through the molten salt into the molten aluminum layer; and performing the heat treatment step by raising the aluminum coated substrate into the first molten salt bath.
Claim 14
Dependent Claim
54 words
The method of claim 8 wherein the first molten salt bath has the composition in weight percent of 50% cryolite, 25% NaCl and 25% LiF, and the second molten salt bath has the composition of 65.5% CaCl 2 and 34.5% NaCl, and the temperature of the first molten salt bath is about 1050° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |