Claims
- 1. A process for producing hydrocarbon and oxygenate-containing mixtures which are limited compositionally in being virtually free of C.sub.11.spsb.+ compounds which comprises contacting synthesis gas comprising hydrogen and carbon oxides with a catalyst at a temperature within the range of between about 500.degree. F. and about 1000.degree. F., a pressure within the range of between about 10 atmospheres and about 200 atmospheres and a gas hourly space velocity within the range of between about 100 and about 10,000, said catalyst comprising a zeolite which is virtually free of acid sites having an acid activity, as measured by the C.P.I. Index, of no greater than 50, and characterized by a silica to alumina mole ratio of at least about 12, a constraint index within the range of 1 to 12, having intimately combined therewith a metal selected from the group consisting of rhodium, platinum, palladium and iridium.
- 2. The process of claim 1 wherein said zeolite has an acid activity as measured by the C.P.I. Index of no greater than 10.
- 3. The process of claim 1 wherein said zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, and ZSM-38.
- 4. The process of claim 3 wherein said zeolite is ZSM-5.
- 5. The process of claim 1 wherein the metal is rhodium.
- 6. The process of claim 1 wherein said metal is impregnated into said zeolite.
- 7. The process of claim 1 wherein the temperature is between about 700.degree. F. and about 900.degree..
- 8. The process of claim 1 wherein the pressure is between about 60 atmospheres and about 100 atmospheres.
- 9. The process of claim 1 wherein the gas hourly space velocity is between about 200 GHSV and about 2,000 GHSV.
- 10. The process of claim 1 wherein said oxygenate-containing mixtures comprise alcohols, aldehydes, ketones, esters and acids.
- 11. The process of claim 1 wherein said zeolite is rendered virtually free of acid sites by base exchange of an acidic zeolite.
- 12. The process of claim 11 wherein said base exchange is carried out with cations selected from the group consisting of metals from Group IA of the Periodic Chart, Group IIA of the Periodic Chart and ammonium cations.
- 13. The process of claim 12 wherein said Group IA cation is a sodium cation.
- 14. The process of claim 1 wherein said zeolite is highly siliceous and sodium exchanged.
- 15. The process of claim 1 wherein said metal is contained in amounts in the range between about 0.1 and about 10 wt. percent in total catalyst.
- 16. The process of claim 15 wherein said metal is contained in amounts in the range between about 0.2 and about 5 wt. percent in total catalyst.
- 17. In a catalytic process for converting synthesis gas comprising hydrogen and carbon oxide, the improvement which comprises
- contacting synthesis gas with a catalyst composition which comprises a zeolite which is virtually free of acid sites and which has an acid activity, as measured by the C.P.I. Index, of no greater than 50, and characterized by a silica to alumina mole ratio of at least about 12, a constraint index within the range of 1 to 12, having intimately combined therewith a metal selected from the group consisting of rhodium, platinum, palladium and iridium to form a product comprising hydrocarbons and organic oxygenates virtually free of C.sub.11.spsb.+ compounds.
- 18. A process according to claim 17 wherein said acid activity, as measured by the C.P.I. Index, is no greater than 10 and wherein said zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35 and ZSM-38.
- 19. A process according to claim 18 wherein said zeolite is ZSM-5 and wherein said metal is rhodium.
- 20. A process according to claim 17 wherein said metal is impregnated in said zeolite in the range of about 0.2 to 5 weight percent of the total composition.
- 21. A process according to claim 17 wherein said zeolite is rendered virtually free of acid sites by base exchange of an acidic zeolite and wherein said base exchange is carried out with cations selected from the group consisting of metals from Group IA of the Periodic Chart, Group IIA of the Periodic Chart and ammonium cations.
- 22. A process according to claim 17 wherein said zeolite is highly siliceous, sodium exchanged ZSM-5 and wherein said metal intimately combined with said zeolite is in the range of from about 0.1 to about 10 weight percent of the total composition.
- 23. The process of claim 17 wherein the synthesis conversion is conducted at a temperature of about 500.degree. F. to 1000.degree. F., at a pressure of about 10 to 200 atmospheres and gas volume hourly space velocity of about 100 to 10,000 GHSV.
- 24. The process of claim 23 wherein the catalyst is contained in a fixed bed of catalyst particles.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a division of U.S. patent application Ser. No. 137,943 filed Apr. 7, 1980, now U.S. Pat. No. 4,344,868, which is a continuation-in-part of application Ser. No. 065,821, filed Aug. 13, 1979, now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1501892 |
Feb 1978 |
GBX |
Divisions (1)
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Number |
Date |
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Parent |
137943 |
Apr 1980 |
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Continuation in Parts (1)
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Number |
Date |
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65821 |
Aug 1979 |
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