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AssigneeExxon Research & Engineering Co.
InventorsM. Albert Vannice, Samuel J. Tauster
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An improved method for the synthesis of hydrocarbons with reduced methane formation and for the selective generation of olefinic hydrocarbons, preferably C.sub.2 -C.sub.5 olefins inclusive, which method comprises the steps of passing a CO and H.sub.2 synthesis gas stream over a catalyst at a temperature and pressure for a time sufficient to generate the desired olefinic products, wherein the improvement consists in using as a catalyst ruthenium on a support comprising at least one refractory Group VB metal oxide. The weight loading of the ruthenium may range from about 0.01 to about 15 wt. % based on the total catalyst weight. The ruthenium average crystallite size is preferably less than 5 nm (50A). The operating conditions of the instant process are typical for Fischer-Tropsch synthesis.
A process for the synthesis of olefins of from C.sub.2 to C.sub.5 chain length inclusive, said process comprising the steps of passing H.sub.2 and CO at a H.sub.2 /CO ratio of 0.1 to about 10 over a catalyst comprising ruthenium on a support selected from the group consisting of V.sub.2 O.sub.3, Nb.sub.2 O.sub.5, Ta.sub.2 O.sub.5, Al.sub.2 O.sub.3 -V.sub.2 O.sub.3, Al.sub.2 O.sub.3 -Nb.sub.2 O.sub.5, Al.sub.2 O.sub.3 -Ta.sub.2 O.sub.5, SiO.sub.2 -V.sub.2 O.sub.3, SiO.sub.2 -Nb.sub.2 O.sub.5, SiO.sub.2 -Ta.sub.2 O.sub.5, V.sub.2 O.sub.3 -carbon, Nb.sub.2 O.sub.5 -carbon, Ta.sub.2 O.sub.5 -carbon, alkaline earth-group VB oxides, alkali-Group VB oxides, rare earth-Group VB oxides, Group IVB-Group VB oxides and mixtures thereof, at a space velocity of from 100 to 50,000 hr.sup.-1 , at a temperature of from 100.degree. to 500.degree. C., at a pressure of from 100 to 10.sup.5 kPa for a time sufficient to effect the generation of the desired olefinic products wherein the concentration of said ruthenium in said catalyst is from 0.01 to 15 wt. % based on total catalyst weight.
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