Claims
- 1. A process for the catalytic cracking of a hydrocarbon feed which comprises: contacting said feed at catalytic cracking conditions with a catalyst comprising: (a) a crystalline metallosilicate zeolite; (b) a non-zeolitic inorganic oxide matrix, said zeolite being dispersed in said matrix, and (c) discrete particles of phosphorus-containing alumina also dispersed in said matrix, said discrete particles having been prepared by contacting alumina having a BET surface area greater than 50 square meters per gram with a phosphorus compound selected from the group consisting of phosphoric acid, a salt of phosphoric acid, phosphorous acid, a salt of phosphorous acid, and mixtures thereof, for a time sufficient to incorporate an effective amount of phosphorus in said alumina.
- 2. The process of claim 1 wherein said phosphorus compound is selected from the group consisting of an ammonium salt of phosphoric acid and ammonium salt of phosphorous acid and mixtures thereof.
- 3. The process of claim 1 wherein said phosphorus is present in said discrete particles of alumina in an amount of at least about 0.1 wt.% based on the weight of said discrete particles of alumina, calculated as elemental phosphorus.
- 4. The process of claim 1 wherein said phosphorus is present in said discrete particles of alumina in an amount ranging from about 0.2 to about 5.0 wt.%, calculated as elemental phosphorus, based on the weight of said discrete particles of alumina.
- 5. The process of claim 1 wherein said catalyst comprises from about 0.04 to about 2.0 wt.% of said phosphorus.
- 6. The process of claim 1 wherein said zeolite is a Y-type zeolite having a unit cell size below 24.7 angstroms.
- 7. The process of claim 1 wherein said zeolite is an ultrastable Y-zeolite having a unit cell size below about 24.5 Angstroms.
- 8. The process of claim 1 wherein said matrix is selected from the group consisting of silica, alumina, silica-alumina, magnesia, zirconia, titania, boria, chromia and mixtures thereof.
- 9. The process of claim 1 wherein said matrix comprises silica-alumina.
- 10. The process of claim 1 wherein said zeolite is an ultrastable Y-type zeolite present in an amount ranging from about 1 to about 40 wt.%, said discrete particles of phosphorus-containing alumina being present in an amount ranging from about 5 to about 40 wt.%, said phosphorus being present in an amount ranging from about 0.5 to about 5.0 wt.%, based on said discrete particles of alumina, and wherein said matrix comprises silica-alumina.
- 11. The process of claim 1 wherein said catalytic cracking conditions include a temperature ranging from about 700.degree. to about 1,300.degree. F.
Parent Case Info
This is a division of application Ser. No. 681 450 filed Dec. 13, 1984.
US Referenced Citations (14)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0150441 |
Sep 1982 |
JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
681450 |
Dec 1984 |
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