Claims
- 1. A process for the catalytic cracking of a hydrocarbon by contact of said hydrocarbon with a catalytic cracking catalyst at catalytic cracking conditions to produce cracked products, characterized by use of a catalyst composition comprising:
- 1 to 60 weight percent framework dealuminated Y zeolite, based on the total weight of the composition;
- 40 to 99 weight percent of a matrix, based on the total weight of said composition;
- 0.01 to 15 weight percent alumina incorporated into said catalyst composition via ion exchange, based on the total weight of said composition;
- 0.01 to 10 weight percent rare earth, expressed as the oxides of same, based on the total weight of said composition, dispersed, impregnated or deposited in a composite of said zeolite and said matrix.
- 2. The process of claim 1 wherein from 1 to 80 weight percent of the matrix is a weighting agent and/or a densifying agent selected from alumina (corundum), TiO.sub.2, ZrO.sub.2 and clays.
- 3. The process of claim 1 wherein the catalyst composition further comprises 0.01 to 1 pbw chromium, expressed as Cr.sub.2 O.sub.3.
- 4. The process of claim 1 wherein the catalyst composition further comprises 1 to 5000 ppm by weight of at least one noble metal and/or rhenium.
- 5. The process of claim 1 wherein the catalyst composition has an alkali metal content of 0.0001 to 1.0 weight percent.
- 6. The process of claim 1 wherein the silica:alumina molar ratio of the framework dealuminated zeolite Y is from 5 to 100.
- 7. The process of claim 1 wherein said zeolite is in the hydrogen, rare-earth or ammonium exchanged form.
- 8. The process of claim 1 wherein said rare earth is lanthanum, cerium or mixtures thereof and/or any element of the lanthanide series of the periodic chart of elements.
- 9. The process of claim 1 wherein said matrix is SiO.sub.2, Al.sub.2 O.sub.3, SiO.sub.2 -Al.sub.2 O.sub.3, TiO.sub.2 ZrO.sub.2 and/or clay.
- 10. The process of claim 1 wherein the unit cell size, as determined by x-ray diffraction, of the zeolite in the finished catalyst is from about 24.25A to about 24.55A.
- 11. The process of claim 1 wherein the catalyst composition further comprises a zeolite having a constraint index of 1 to 12.
- 12. The process of claim 1 wherein the feedstock comprises at least 50% wt. atmospheric resid.
- 13. The process of claim 1 wherein the cracking process is a fluidized-bed process.
- 14. The process of claim 1 wherein the cracking process is a moving-bed process.
- 15. A process for the catalytic cracking of a hydrocarbon by contact of said hydrocarbon with a catalytic cracking catalyst at catalytic cracking conditions to produce cracked products, characterized by use of an aluminum and rare earth exchanged, framework dealuminated zeolite cracking catalyst comprising:
- 1 to 60 weight percent framework dealuminated Y zeolite having a framework silica:alumina molar ratio of 5:1 to 100:1;
- 0.01 to 15 weight percent alumina added to said catalyst via aluminum exchange;
- 0.01 to 10 weight percent rare earth oxides; and
- 40 to 99 weight percent matrix.
- 16. The process of claim 1 wherein the Y zeolite is an ultrastable Y (USY) zeolite.
- 17. The process of claim 15 wherein the Y zeolite is an ultrastable Y (USY) zeolite.
- 18. The process of claim 1 wherein the rare earth content of the cracking catalyst is 0.4 to 1.4 weight percent.
- 19. The process of claim 15 wherein the rare earth content of the cracking catalyst is 0.4 to 1.4 weight percent.
CROSS REFERENCE TO RELATED APPLICATIONS
This is a divisional of copending application Ser. No. 140,872, filed on Jan. 6, 1988, and now U.S. Pat. No. 4,880,787. Application Ser. No. 140,872 is a continuation-in-part of Ser. No. 897,000, filed Aug. 15, 1986, and now abandoned, relied upon and incorporated by reference herein.
US Referenced Citations (20)
Non-Patent Literature Citations (1)
Entry |
J. S. Magee, W. E. Cormier, G. M. Woltermann, "Octane Catalysts Contain Special Sieves", May 27, 1985, pp. 59-64. |
Divisions (1)
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Number |
Date |
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Parent |
140872 |
Jan 1988 |
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Continuation in Parts (1)
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Number |
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897000 |
Aug 1986 |
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