Claims
- 1. A process for cracking a gas oil, said process comprising contacting said gas oil under sufficient cracking conditions with a catalyst comprising yttrium containing ultrastable zeolite Y, said zeolite Y being essentially free of rare earth ions, wherein said cracking conditions include a temperature of from about 300.degree. C. to about 700.degree. C., a pressure of from about 0.1 atmosphere (bar) to about 30 atmospheres and a weight hourly space velocity of from about 0.1 to about 20, wherein said catalyst contains at least 0.1 wt % yttrium, wherein said catalyst contains no intentionally added rare earth ions, and wherein said zeolite Y contains no more than about 0.02 wt % of rare earth elements as measured by elemental analysis.
- 2. A process according to claim 1, wherein said process is a fluid-bed catalytic cracking or a thermofor catalytic cracking process.
- 3. A process according to claim 1, wherein said gas oil is combined with a resid.
- 4. A process according to claim 1, wherein said zeolite Y is a dealuminated Y.
- 5. A process according to claim 1, wherein said zeolite Y is a silicon-enriched, dealuminated Y.
- 6. A process according to claim 1, said catalyst further comprising a matrix for said zeolite Y.
- 7. A process according to claim 6, said catalyst comprising from 10 wt % to 80 wt % of said zeolite Y.
- 8. A process according to claim 7, wherein said matrix comprises silica, alumina or silica-alumina.
- 9. A process according to claim 8, wherein said matrix further comprises clay.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a division of U.S. application Ser. No. 07/918,772, filed Jul. 27, 1992, now U.S. Pat. No. 5,258,341, which is a continuation of U.S. application Ser. No. 07/636,834, filed Jan. 2, 1991, now abandoned. The entire disclosures of these applications are expressly incorporated herein by reference.
US Referenced Citations (12)
Foreign Referenced Citations (1)
Number |
Date |
Country |
20366 |
Jun 1971 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
918772 |
Jul 1992 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
636834 |
Jan 1991 |
|