High cobalt content, high cobalt surface area catalysts, preparation and use thereof
AssigneeJohnson Matthey PLC
InventorsCornelis Martinus Lok, John West
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Abstract
A particulate catalyst comprises an intimate mixture of cobalt and aluminum compounds at an atomic ratio in the range 10:1 to 2:1 (Co:Al), which when reduced at 425° C., has a cobalt surface area as measured by hydrogen chemisorption at 150° C. of at least 30 m2/g of catalyst. The catalyst is prepared by sequential precipitation of cobalt with aluminum ions in the presence of an alkaline precipitation agent. The catalyst may be used for the hydrogenation of unsaturated compounds or the Fischer-Tropsch synthesis of hydrocarbons.
Claims19
A process for the Fischer-Tropsch synthesis of hydrocarbons comprising the step of reacting a mixture of carbon monoxide and hydrogen in the presence of a particulate catalyst comprising a precipitated intimate mixture of precipitated cobalt and aluminum compounds in which the cobalt compounds are supported on cobalt-aluminum compounds, said mixture having a cobalt content ≧60% wt and a cobalt and aluminum at an atomic ratio in the range 10:1 to 2:1 (Co:Al), which when reduced at 425° C., has a cobalt surface area as measured by hydrogen chemisorption at 150° C. of at least 30 m2/g of catalyst wherein the catalyst is prepared by steps comprising:
- (i) precipitating an insoluble cobalt compound from an aqueous solution of a cobalt salt with an excess alkaline precipitating agent,
- (ii) adding a soluble aluminum compound,
- (iii) aging the resulting precipitate in suspended form,
- (iv) recovering and drying the catalyst composition, and
- (v) activating the catalyst by reduction using a hydrogen-containing gas.
Dependencies are inferred from the claim text.