Claims
- 1. A method for dehydrogenating a dehydrogenatable hydrocarbon comprising contacting the hydrocarbon, at dehydrogenation conditions, with a catalytic composite comprising a porous carrier material containing, on an elemental basis, about 0.01 to about 2 wt. % platinum group metal, about 0.01 to about 5 wt. % germanium and about 0.01 to about 3 wt. % Group VI-B transition metal; wherein the platinum group metal, germanium and Group VI-B transition metal are uniformly dispersed throughout the porous carrier material; wherein substantially all of the platinum group metal is present in the elemental metallic state; wherein substantially all of the germanium and Group VI-B transition metal are present in an oxidation state above that of the elemental metal; and wherein the atomic ratio of Group VI-B transition metal to platinum group metal is about 0.05:1 to about 4:1.
- 2. The method as defined in claim 1 wherein the catalytic composite contains about 0.1 to about 5 wt. % alkali or alkaline earth metal in an oxidation state above that of the elemental metal and uniformly dispersed throughout the porous carrier material.
- 3. A method as defined in claim 2 wherein the alkali metal or alkaline earth metal is potassium.
- 4. A method as defined in claim 2 wherein the alkali metal or alkaline earth metal is lithium.
- 5. A method as defined in claim 2 wherein the dehydrogenatable hydrocarbon is admixed with hydrogen when it contacts the catalytic composite.
- 6. A method as defined in claim 1 wherein the dehydrogenatable hydrocarbon is admixed with hydrogen when it contacts the catalytic composite.
- 7. A method as defined in claim 6 wherein the dehydrogenation conditions include a temperature of 700 to about 1200.degree. F., a pressure of 0.1 to 10 atmospheres, an LHSV of 1 to 40 hr..sup.-1, and a hydrogen to hydrocarbon mole ratio of about 1:1 to about 20:1.
- 8. A method as defined in claim 1 wherein the porous carrier material is a refractory inorganic oxide.
- 9. A method as defined in claim 8 wherein the refractory inorganic oxide is alumina.
- 10. A method as defined in claim 1 wherein the platinum group metal is platinum.
- 11. A method as defined in claim 1 wherein the platinum group metal is palladium.
- 12. A method as defined in claim 1 wherein the platinum group metal is iridium.
- 13. A method as defined in claim 1 wherein the Group VI-B transition metal is tungsten.
- 14. A method as defined in claim 1 wherein the Group VI-B transition metal is molybdenum.
- 15. A method as defined in claim 1 wherein the Group VI-B transition metal is chromium.
- 16. A method as defined in claim 1 wherein the composite contains, on an elemental basis, about 0.05 to about 1 wt. % platinum group metal, about 0.05 to about 2 wt. % germanium and about 0.05 to about 1 wt. % Group VI-B transition metal.
- 17. A method as defined in claim 1 wherein the metals content of the catalytic composite is adjusted so that the atomic ratio of Group IV-A metal to platinum group metal is about 0.05:1 to about 10:1.
- 18. A method as defined in claim 1 wherein the catalytic composite contains about 0.05 to about 0.5 wt. % sulfur, calculated on an elemental basis.
CROSS-REFERENCES TO RELATED APPLICATIONS
This application is a continuation-in-part of my prior, copending application Ser. No. 442,714 filed Feb. 14, 1974, now U.S. Pat. No. 3,928,177, which in turn is a continuation-in-part of my prior application Ser. No. 216,739 filed Jan. 10, 1972, and now U.S. Pat. No. 3,806,446; and which in turn is a division of my prior, now abandoned application Ser. No. 17,886 filed Mar. 9, 1970. All of the teachings of these prior applications are specifically incorporated herein by reference.
US Referenced Citations (8)
Divisions (1)
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Date |
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Parent |
17886 |
Mar 1070 |
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Continuation in Parts (2)
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442714 |
Feb 1974 |
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Parent |
216739 |
Jan 1972 |
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