Claims
- 1. A process for the conversion of alkane to alkene comprising, contacting at a temperature in the range of approximately 200° C. to 400° C.:
(a) a feedstream comprising alkane and an oxygen-containing gas; and (b) a supported silver catalyst comprising
(i) an inert refractory solid support comprised of alkaline earth metal carbonate, (ii) a catalytically effective amount of silver, (iii) an effective promoting amount of a halide anion, (iv) an effective promoting amount of a rare earth metal promoter, (v) an effective promoting amount of a sodium promoter, and (vi) an optional effective promoting amount of a transition metal promoter.
- 2. A process of claim 1, wherein the catalyst is prepared by precipitation.
- 3. A process of claim 1, wherein the feedstream is essentially free of carbon dioxide.
- 4. The process of claim 1, wherein the rare earth metal promoter is lanthanum.
- 5. The process of claim 1, wherein the alkaline earth metal carbonate support is selected from the group consisting of strontium carbonate, calcium carbonate, barium carbonate and mixtures thereof.
- 6. The process of claim 5, wherein the alkaline earth metal carbonate is a barium carbonate support.
- 7. A process for the conversion of propane to propylene comprising contacting at a temperature in the range of approximately 250° C. to 350° C.:
(a) a feedstream comprising propane and an oxygen-containing gas; and (b) a supported silver catalyst comprising
(i) an inert refractory solid support comprised of alkaline earth metal carbonate, (ii) a catalytically effective amount of silver, (iii) an effective promoting amount of a halide anion, (iv) an effective promoting amount of a rare earth metal promoter, (v) an effective promoting amount of a sodium promoter, and (vi) an optional effective promoting amount of a transition metal promoter.
- 8. A process of claim 7, wherein the catalyst is prepared by precipitation.
- 9. A process of claim 7, wherein the feedstream is essentially free of carbon dioxide.
- 10. The process of claim 7, wherein the rare earth metal promoter is lanthanum.
- 11. The process of claim 7, wherein the alkaline earth metal carbonate support is selected from the group consisting of strontium carbonate, calcium carbonate, barium carbonate and mixtures thereof.
- 12. The process of claim 11, wherein the alkaline earth metal carbonate support is a barium carbonate support.
- 13. The process of claim 7, wherein the alkali metal halide is sodium chloride.
- 14. The process of claim 7, wherein the sodium promoter is sodium nitrate.
- 15. The process of claim 7, wherein the promoting amount of transition metal promoter is present.
- 16. The process of claim 15, wherein the transition metal promoter is selected from the group consisting of chromium, copper and magnesium.
- 17. The process of claim 16, wherein the transition metal promoter is chromium.
CROSS REFERENCE To RELATED APPLICATIONS
[0001] This application is a divisional of U.S. Ser. No. 09/792,390, filed on Feb. 22, 2001.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09792390 |
Feb 2001 |
US |
Child |
10346679 |
Jan 2003 |
US |