Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Method for producing supported Raney nickel catalyst.

Authors
Oden-LL; Shanker-PE; Russell-JH
Source
U S Pat 4,049,580 1977 Sep; :1-7
NIOSHTIC No.
10012028
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 1,133 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. Thus, Al pieces sufficient to form a molten pool 8 cm deep were placed in a graphite crucible and covered with an equal depth of a mixture of cryolite 50, NaCl 25, and lif 25 wt pct. The crucible was placed in an electric furnace and heated to a temperature of 1,050 deg C to melt the aluminum and salt mixture; the crucible then contained a layer of molten salt floating on the molten aluminum. Ni substrate was prepared by spot welding 16 mesh Ni screen (0.305 Mm wire) to a 0.5 Mm thick Ni sheet, using 2 welds per square inch. The screen was fastened to both sides of the Ni sheet. These pieces then were heated to 1,050 deg C by lowering them into the salt bath for 5 s. Thereafter they were lowered into the molten Al for 1 s to secure a continuous coating of Al and then raised into the molten salt bath and held there for 2.5 S for heat treatment. The specimens then were quickly transferred to a cooling molten salt bath of a eutectic mixture of 65.5 pct CaCl2 and 34.5 pct NaCl at a temperature of 700 deg C and kept there for 30 s for rapid cooling and to replace insoluble fluoride salts present. After cooling to room temperature the specimens were washed with (Abstract Truncated)
Keywords
Metallurgical-processes; Metallurgy; Nickel-compounds; Aluminum-compounds; Metal-compounds; Metallic-compounds; Metallic-salts; Metals
Publication Date
19770920
Document Type
Patent
Fiscal Year
1977
NTIS Accession No.
NTIS Price
Identifying No.
PAT 4,049,580
NIOSH Division
ALRC
Source Name
U.S. Pat. 4,049,580, Sept. 20, 1977
State
OR
TOP