Claims
- 1. A catalyst composition useful for the conversion of synthesis gas to liquid hydrocarbons which comprises cobalt dispersed and impregnated as a catalytically active layer upon the surface of a support, the support being at least about 80% by weight titania, the layer ranging in average thickness from about 0.2 mm to about 0.20 mm with the cobalt loading being about 0.04 g/cc to about 0.15 g/cc, calculated as metallic cobalt per packed bulk volume of catalysts, and having a productivity and methane selectivity at 200.degree. C. of at least 150 hr.sup.-1 and no more than 10 mole %, respectively.
- 2. The composition of claim 1 wherein the cobalt loading is about 0.05 g/cc.
- 3. The composition of claim 1 wherein rhenium is included as a promoter in the catalytically active surface layer in a weight ratio of cobalt to rhenium of about 30:1 to about 2:1.
- 4. The composition of claim 1 wherein hafnium is included as a promoter in the catalytically active surface layer in a weight ratio of cobalt to hafnium of about 30:1 to about 2:1.
- 5. The composition of claim 1 wherein the titania support has a rutile:anatase ratio of at least about 3:2.
- 6. A catalyst composition useful for the conversion of synthesis gas to liquid hydrocarbons which comprises cobalt dispersed and impregnated as a catalytically active layer upon the surface of a support which is at least about 80% by weight titania, the layer ranging in average thickness from about 0.04 mm to about 0.20 mm, with the loading of cobalt ranging from about 0.04 g/cc to about 0.15 g/cc, calculated as metallic cobalt per packed bulk volume of catalyst, and having a productivity and methane selectivity at 200.degree. C. of at least 150 hr.sup.-1 and no more than 10 mole %, respectively.
- 7. The composition of claim 6 wherein rhenium is included as a promoter in the catalytically active surface layer in a weight ratio of cobalt to rhenium of about 30:1 to about 2:1.
- 8. The composition of claim 6 wherein the cobalt loading ranges from about 0.05 g/cc to about 0.15 g/cc.
- 9. In a process for the production of catalysts having a productivity and methane at 200.degree. C. selectively of at least 150 hr.sup.-1 and no more than 10 mole %, respectively, wherein cobalt is dispersed and impregnated as a catalytically active material upon a particulate titania or substantially titania-containing support, the steps comprising heating said support to a temperature equal to or in excess of 140.degree. C., and repetitively contacting said heated support with a spray of a solution which contains from about 0.05 g/ml to about 0.25 g/ml of a cobalt compound, calculated as metallic cobalt, while drying and calcining the cobalt-containing support between each contact with the solution, to form a catalytically active layer upon the surface of said support of average thickness ranging from about 0.02 mm to about 0.20 mm, with the loading of cobalt ranging from about 0.04 g/cc to about 0.15 g/cc, calculated as metallic cobalt per packed volume of catalyst.
- 10. The process of claim 9 wherein the average thickness of the layer of cobalt ranges from about 0.04 mm to about 0.20 mm with the cobalt loading ranging from about 0.05 g/cc to about 0.15 g/cc.
- 11. The process of claim 9 wherein the particulate support is heated to a temperature ranging from about 140.degree. C. to about 185.degree. C.
- 12. The process of claim 9 wherein the particulate support is subjected to from about 3 to about 12 contacts with the spray solution.
- 13. The process of claim 12 wherein the particulate titania or titania-containing support is subjected to from about 5 to about 8 contacts with the spray solution.
- 14. The process of claim 9 wherein the cobalt containing solution contains rhenium.
CROSS REFERENCE TO RELATED APPLICATIONS
This is a continuation-in-part of U.S. Ser. No. 046,649 filed May 7, 1987 now abandoned.
US Referenced Citations (13)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
46649 |
May 1987 |
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