Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1976-01-23
1977-08-16
Shine, W. J.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
48214A, 260449M, B01J 2104, B01J 2374
Patent
active
040425320
ABSTRACT:
Nickel-alumina catalysts having a remarkably high degree of thermal stability, and active for the hydrogenation of carbon oxides (methanation), steam reforming, gasification, etc. are prepared by a novel "precipitative-occlusion" method. This method involves digesting a slurry of an alumina hydrate in an aqueous solution of an ammino complex of a nickel salt. The digestion is carried out at a temperature sufficiently high to decompose the ammino complex and "release" the nickel (II) ions. This results in a gradual precipitation of nickel hydroxide in the pores and interstices formed by the agglomerating particles of alumina hydrate. The coflocculated solids are recovered as by filtration, washed, dried and calcined. The resulting compositions are found, in high temperature reactions such as methanation, to retain their activity for much longer periods of time than do conventional nickel-alumina catalysts prepared by the most widely used prior art technique, viz., coprecipitation.
REFERENCES:
patent: 3156657 (1964-11-01), Pinder et al.
patent: 3361535 (1968-01-01), Pollitzer et al.
Hartman Richard C.
Henderson Lannas S.
Sandford Dean
Shine W. J.
Union Oil Company of California
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