1969 Volume 42 Issue 10 Pages 2961-2965
A novel method of synthesizing cobalt carbonyl was investigated by using noble metal catalysts. It has been observed that the materials containing palladium, i. e., palladium black, palladium chloride, palladium acetylacetonate, bistriphenylphosphine dichloropalladium, and palladium-on-carriers, have a catalytic effect on the cobalt carbonylation reaction, and that palladium-on-carbon (Pd-C) is the most active catalyst. The reactivity of cobalt compounds in the cobalt carbonylation reaction catalyzed by noble metals increases in this order: CoSO4<<CoO\lesssimCo(OAc)2\lesssimCo-oleate<Co(OH)2. When the Pd-C catalyst is used, cobalt hydroxide reacts with synthesis gas of 150 kg/cm2 to give cobalt carbonyl almost quantitatively, even at from 50 to 55°C. The catalytic activities of noble metals were shown to be, in the order of decreasing activity: Pd>Au>Pt>>Ag. The effect of the catalyst concentration and the activity of noble-metal catalysts were also compared with those in the case of dicobalt octacarbonyl, as an autocatalyst.
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