Cobalt-promoted catalysts for use in Fischer-Tropsch slurry process
AssigneeExxon Research & Engineering Co.
InventorsRocco A. Fiato, Stuart L. Soled
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Abstract
Slurried low initial surface area Fe--Co spinels, containing low levels of cobalt, which are fully reduced/carburized ex situ, provide exceptionally high activity and selectivity in the conversion of CO/H.sub.2 to alpha olefins in a slurry type process. These slurried unsupported iron-cobalt catalysts maintain good activity and selectivity under low pressure reaction conditions.
Claims23
A slurry process for synthesizing a hydrocarbon mixture containing C.sub.2 -C.sub.4 olefins comprising the step of contacting a liquid slurry catalyst system, comprised of a slurry liquid and a carbided and reduced, unsupported iron-cobalt single phase spinel catalyst containing a Group IA or IIA metal salt promoter agent, and said spinel having the initial empirical formula:
- Fe.sub.x Co.sub.y O.sub.4
- wherein x and y are integer or decimal values, other than zero, with the provisos that the sum of x+y is 3 and the ratio of x/y is 7:1 or above, said spinel exhibiting a single phase X-ray diffraction pattern substantially isostructural with that of Fe.sub.3 O.sub.4 and said spinel having a measured BET surface area of up to 5 m.sup.2 /g, said process being conducted with a mixture of CO and hydrogen under conditions of pressure, space velocity, and elevated temperature, for a time sufficient to produce said product C.sub.2 -C.sub.4 olefins.
A process for synthesizing a hydrocarbon mixture containing C.sub.2 -C.sub.4 olefins comprising the step of contacting a liquid slurry catalyst system, comprised of octacosane and ex situ reduced and carbided unsupported Fe.sub.2.85 Co.sub.0.15 O.sub.4 /1% K single phase spinel catalyst having a measured BET surface area of up to 5 m.sup.2 /g, with a 1:1 H.sub.2 /CO mixture at 250.degree. C., 1200 v/v/hr., 70 psig, for a sufficient time to produce said C.sub.2 -C.sub.4 olefins.
Dependencies are inferred from the claim text.