Claims
- 1. A method for catalytically converting alkanes comprising contacting the alkanes under converting conditions with a catalyst by forming a reaction mixture consisting essentially of said alkanes and a catalyst consisting essentially of components selected from the group consisting of:
- (A) two alkaline earth oxides and a promoting amount of a promoter selected from the group consisting of manganese oxide and a mixture of manganese oxide and rhenium oxide,
- (B) at least one alkaline earth oxide and a promoting amount of rhenium oxide, and
- (C) an alkaline earth oxide selected from the group consisting of strontium and barium and a promoting amount of a promoter selected from the group consisting of manganese oxide and a mixture of manganese oxide and rhenium oxide.
- 2. The method of claim 1 wherein the promoting amount is in the range of from about 0.1 to about 30 parts by weight per 100 parts by weight alkaline earth oxide.
- 3. The method of claim 1 wherein the promoting amount is in the range of from about 1 to about 15 parts by weight per 100 parts by weight alkaline earth oxide.
- 4. The method of claim 1 wherein the alkaline earth oxide in (A) and (B) is selected from the group consisting of magnesium, calcium, and strontium.
- 5. The method of claim 1 wherein the alkanes are catalytically cracked employing the catalyst which is treated with dry air at a temperature in the range of from about 750.degree. to about 1200.degree. F (approximately 400.degree. to about 650.degree. C) for a period of time ranging from about 0.1 hour to about 20 hours prior to contacting said alkanes.
- 6. The method of claim 5 wherein the cracking temperature is in the range of from about 450.degree. to about 600.degree. C (842.degree. to about 1112.degree. F); wherein the cracking pressure is in the range of from about 0 to about 200 psig; and wherein the feed-to-catalyst contact time is in the range of from about 0.1 to about 50 seconds.
- 7. The method of claim 5 wherein the alkaline earth oxide in (A) and (B) is a mixture of magnesium oxide and calcium or strontium oxide, the weight ratio of magnesium oxide to calcium or strontium oxide is in the range of from about 20:1 to about 8:1, and the catalyst is treated at a temperature ranging from about 950.degree. to about 1050.degree. F (510.degree. to about 566.degree. C) for a period of time ranging from about 1 to about 4 hours.
- 8. The method of claim 1 wherein the alkanes are catalytically dehydrocyclized employing the catalyst which is treated with hydrogen at a temperature in the range of from about 750.degree. to about 1200.degree. F (approximately 400.degree. to about 650.degree. C) for a period of time ranging from about 0.1 hour to about 20 hours prior to contacting said alkanes, and wherein said alkanes are linear or branched substituted or unsubstituted alkanes having 6 or more carbon atoms per molecule.
- 9. The method of claim 8 wherein the alkanes contain carbon chains of at least 6 carbon atoms, either unsubstituted or substituted with one or more alkyl side chains.
- 10. The method of claim 8 wherein the dehydrocyclization temperature is in the range of from about 450.degree. to about 600.degree. C (842.degree. to about 1112.degree. F); wherein the dehydrocyclization pressure is in the range of from about 0 to about 200 psig; and wherein the feed to catalyst contact time is in the range of from about 0.1 to about 50 seconds.
- 11. The method of claim 8 wherein the alkaline earth oxide in (A) and (B) is a mixture of magnesium oxide and calcium or strontium oxide, the weight ratio of the magnesium oxide to calcium or strontium oxide is in the range of from about 100:1 to about 5:1, and the catalyst is treated at a temperature ranging from about 950.degree. to about 1050.degree. F (510.degree. to about 566.degree. C) for a period of time ranging from about 1 to about 4 hours.
RELATED APPLICATION
This application is a continuation in part of my copending application Ser. No. 460,935 filed Apr. 15, 1974, now abandoned.
US Referenced Citations (17)
Continuation in Parts (1)
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Number |
Date |
Country |
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460935 |
Apr 1974 |
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