Claims
- 1. In the process of carrying out aromatization hydrocarbon conversion reactions over a catalyst comprising a crystalline zeolite characterized by a silica to alumina molar ratio of at least 12 and a Constraint Index of from about 1 to 12, the improvement which comprises:
- pretreating said catalyst to reduce the rate of catalyst aging and detrimental formation of coke thereon which occurs during said conversion reactions, by reacting said catalyst with a phosphorus-containing compound to deposit between 2% and 15% by weight of phosphorus on said catalyst and by subjecting said catalyst to an atmosphere comprising from 5% to 100% of steam at a temperature of from about 250.degree. C. to about 1000.degree. C. for a period of from about 15 minutes to about 100 hours.
- 2. A process as recited in claim 1 wherein said catalyst additionally comprises a binder therefor.
- 3. A process as recited in claim 2 wherein said binder is Al.sub.2 O.sub.3.
- 4. A process according to claim 1 wherein said catalyst is contacted with steam before being reacted with phosphorus-containing compound in order to effect catalyst pretreatment.
- 5. A process as recited in claim 4 wherein said catalyst additionally comprises a binder therefor.
- 6. A process as recited in claim 5 wherein said binder is Al.sub.2 O.sub.3.
- 7. A process according to claim 1, 2, 3, 4, 5 or 6 wherein said crystalline zeolite is selected from ZSM-5, ZSM-11, ZSM-23, ZSM-35 and ZSM-38.
- 8. A process according to claim 7 wherein said crystalline zeolite is ZSM-5.
CROSS-REFERENCE TO RELATED APPLICATION
This application is divisional of the abandoned application of Lewis B. Young having Ser. No. 061,223 filed July 27, 1979, now abandoned.
US Referenced Citations (8)
Divisions (1)
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Number |
Date |
Country |
Parent |
61223 |
Jul 1979 |
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