Cobalt-promoted fischer-tropsch catalysts
AssigneeExxon Research & Engineering Co.
InventorsRocco A. Fiato, Stuart L. Soled, Angelo A. Montagna
Life of this patent
Estimating the term…
Abstract
Iron-cobalt spinels which contain low levels of cobalt, in an iron/cobalt atomic ratio of 7:1 to 35:1, are converted to Fischer-Tropsch catalysts upon reduction and carbiding that exhibit high activity and selectivity to C.sub.2 -C.sub.6 olefins and low CH.sub.4 production.
Claims15
A fixed bed process for synthesizing a hydrocarbon mixture containing C.sub.2 -C.sub.6 olefins comprising the step of contacting a fixed bed of a catalyst composition comprised of an unsupported Group IA or IIA metal salt promoted iron-cobalt spinel:
- said spinel exhibiting a single spinel phase, being isostructural with Fe.sub.3 O.sub.4 as determined by X-ray diffractometry and possessing a BET nitrogen surface area of up to 5 m.sup.2 /g, and an iron-cobalt atomic ratio of 7:1 or above;
- with a mixture of CO/hydrogen under process conditions of pressure, space velocity (SHSV) and elevated temperature for a time sufficient to produce said C.sub.2 -C.sub.6 olefins.
A fixed bed process for synthesizing a hydrocarbon mixture containing C.sub.2 -C.sub.6 olefins comprising the step of contacting a fixed bed of a catalyst composition comprised of an unsupported iron-cobalt spinel of the formula:
- Fe.sub.2.85 CO.sub.0.15 O.sub.4, containing about 1 gram-atom percent potassium as the carbonate, wherein said spinel exhibits a single spinel phase being isostructural with Fe.sub.3 O.sub.4 as determined by X-ray diffractometry and initially possessing a surface area of about 1 m.sup.2 /g, with a 2:1 to 1:1 H.sub.2 /CO mixture, at about 150-300 psig, 1000-1800 v/v/hr (SHSV) and about 230.degree.-270.degree. C. for a time sufficient to produce said C.sub.2 -C.sub.6 olefins.
Dependencies are inferred from the claim text.