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US 7,732,370 B2Granted
Catalysts
AssigneeJohnson Matthey PLC
InventorsJohn Leonello Casci, Carl Leonard Huitson, Cornelis Martinus Lok
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AssigneeJohnson Matthey PLC
InventorsJohn Leonello Casci, Carl Leonard Huitson, Cornelis Martinus Lok
Estimating the term…
A catalyst including cobalt, zinc oxide and aluminium is described, having a total cobalt content of 15-75% by weight (on reduced catalyst), an aluminium content ≧10% by weight (based on ZnO) and which when reduced at 425° C., has a cobalt surface area as measured by hydrogen chemisorption at 150° C. of at least 20 m2/g cobalt. A method for preparing the catalyst is also described including combining a solution of cobalt, zinc and aluminium with an alkaline solution to effect co-precipitation of a cobalt-zinc-aluminium composition from the combined solutions, separating of the co-precipitated composition form the combined solutions, heating the composition to form an oxide composition, and optionally reducing at least a portion of the cobalt to cobalt metal. The catalysts may be used for hydrogenation reactions and for the Fischer-Tropsch synthesis of hydrocarbons.
An unreduced catalyst consisting of cobalt species, zinc oxide, and aluminium, and optionally one or more promoters selected from the group consisting of magnesia, ceria, lanthana, titania, zirconia, hafnia, ruthenium, platinum, palladium, rhenium, and a combination thereof, wherein the cobalt species are intimately mixed with aluminium containing zinc oxide in which the aluminium is in the form of at least one of alumina or ZnAl2O4, the aluminium is present in an amount of about 10-66% by weight (based on ZnO) and the cobalt species are present in an amount such that when the catalyst precursor is reduced to form a reduced catalyst the cobalt content is about 15-75% based on the reduced catalyst, and when the catalyst precursor is reduced at 425° C., the reduced catalyst has a cobalt surface area as measured by hydrogen chemisorption at 150° C. of at least 20 m2/g of cobalt.
A reduced catalyst consisting of cobalt species, zinc oxide, and aluminium, wherein at least a portion of the cobalt species is elemental cobalt and the cobalt species are intimately mixed with aluminium containing zinc oxide in which the aluminium is in the form of at least one of alumina or ZnAl2O4, and optionally one or more promoters selected from the group consisting of magnesia, ceria, lanthana, titania, zirconia, hafnia, ruthenium, platinum, palladium, rhenium, and a combination thereof, the aluminium is present in an amount in the range of 10-66% by weight (based on ZnO) and the cobalt is present in an amount of 15-75% based on the reduced catalyst, and when reduced at 425° C., the reduced catalyst has a cobalt surface area as measured by hydrogen chemisorption at 150° C. of at least 20 m2/g of cobalt.
Dependencies are inferred from the claim text.