Claims
- 1. A method of activation a catalyst composition comprising a framework aluminum-deficient crystalline aluminosilicate zeolite containing non-framework aluminum which comprises
- providing said aluminum-deficient zeolite, which as been deactivated by removal of aluminum from said framework, during exposure to at least one gas selected from the group consisting of oxygen and steam, under conditions effective to remove said aluminum from said framework
- contacting said catalyst composition with a dilute aqueous fluoride solution of from about 0.001 to 0.1 N, wherein said solution is essentially free of zeolite framework substituting atoms at a temperature of about 20 to 100.degree. C. for about 0.1 to 48 hours, wherein said fluoride solution is prepared from at least one fluoride reagent selected from the group consisting of, ammonium hydrogen fluoride and a mixture of ammonium fluoride and hydrogen fluoride converting said fluoride solution treated catalyst to its ammonium exchanged form, thereafter calcining said converted catalyst, wherein said catalyst composition treated by said method has been previously utilized in an organic compound conversion or contacted with steam, under conditions sufficient to deactivate said composition by removal of aluminum from said zeolite framework; and
- recovering said zeolite which exhibits a hexane cracking activity greater than that of the aluminum-deficient zeolite.
- 2. The method of claim 1 wherein said fluoride solution contacted catalyst composition is converted to its ammonium exchanged form under conditions including contact with an aqueous ammonium ion solution of from about 0.05N to 5N at a temperature of from about 20.degree. C. to 100.degree. C. for from about 0.25 to 6 hours.
- 3. The method of claim 2 which includes calcining said aqueous ammonium ion solution contacted catalyst composition at a temperature of from about 200.degree. to about 600.degree. C. for about 1 minute to 48 hours.
- 4. The method of claim 3 wherein said contacting with fluoride solution is with a fluoride solution of from about 0.01 to 0.1 N at a temperature of from about 60.degree. to 95.degree. C. for about 6 to 18 hours.
- 5. The method of claim 4 wherein said contacting with aqueous ammonium ion solution is with an ammonium ion solution of about 0.5 to 2 N, a temperature of from about 25.degree. to 50.degree. C., for from about 0.5 to 3 hours, and said calcining occurs at a temperature of from about 500.degree. to about 550.degree. C. for about 0 to 6 hours.
- 6. The method of claim 3 wherein said zeolite has a silica to alumina molar ratio of at least about 4.
- 7. The method of claim 4 wherein said zeolite has a silica to alumina molar ratio of at least about 26.
- 8. The method of claim 3 wherein said zeolite is selected from the group consisting of large pore structure zeolites exhibiting a Constraint Index of less than about 1 and intermediate pore structure zeolites exhibiting a Constraint Index of from about 1 to 12.
- 9. The method of claim 8 wherein said zeolite is a zeolite selected from the group consisting of zeolite Y, Ultrastable Y, zeolite X, and mordenite.
- 10. The method of claim 8 wherein said zeolite is a zeolite selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38, ZSM-48 and zeolite beta.
- 11. The method of claim 3 wherein said activation is carried out in the absence of added aluminum.
- 12. The method of claim 3 wherein said catalyst composition is a composition of said zeolite and an inorganic oxide matrix.
- 13. The method of claim 3 wherein said catalyst composition is a composite of said zeolite and an inorganic oxide matrix.
- 14. The method of claim 9 wherein the hexane cracking activity is measured as the alpha value and wherein the alpha value of said catalyst composition is increased.
- 15. The method of claim 9 wherein the crystallinity of said catalyst composition is increased.
Parent Case Info
This application is a continuation of Ser. No. 060,542, filed June 11, 1987 (now abandoned), which in turn is a continuation-in-part of Ser. No. 059,368, filed June 8, 1987 (now abandoned).
US Referenced Citations (16)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0072920 |
Mar 1983 |
EPX |
0108611 |
May 1983 |
EPX |
2010496 |
Mar 1969 |
DEX |
Continuations (1)
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Number |
Date |
Country |
Parent |
60542 |
Jun 1987 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
59368 |
Jun 1987 |
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