Claims
- 1. Process for hydroconversion which comprises contacting a hydrocarbon feedstock in the presence of added a hydrogen under hydroconversion condition with a catalyst composition which comprises a metal hydrogenation component and a modified form of zeolite Y prepared by
- (a) ammonium ion-exchanging zeolite Y to lower its sodium content to less than 3.0 weight percent;
- (b) hydrothermal steaming the low-sodium product of step (a) at a temperature of 550.degree. to about 850.degree. to reduce the unit cell dimension;
- (c) contacting the steamed product of step (b) with a sufficient amount of an aqueous solution of ammonium ions having a pH of less than about 4.0 for a sufficient time to exchange at least some of the residual sodium cations for ammonium ions and to increase the bulk Si/Al.sub.2 molar ratio of the zeolite composition to the range of 6.5 to 20.
- 2. Process according to claim 1 wherein the hydroconversion process is hydrocracking.
- 3. Process according to claim 1 wherein the hydroconversion process is reforming.
- 4. Process according to claim 1 wherein the hydroconversion process is hydrodealkylation.
- 5. Process according to claim 1 wherein the hydroconversion process is isomerization.
- 6. Process according to claim 5 wherein the hydroconversion process is hydroisomerization.
- 7. Process according to claim 1 wherein the hydroconversion process is hydrofining.
- 8. Process according to claim 1 wherein the zeolite constituent of the catalyst composition contains rare earth cations by virtue of contacting the product of step (a) with rare earth cations under ion-exchange conditions.
RELATED APPLICATIONS
This application is a continuation-in-part of copending application Ser. No. 417,611, filed Oct. 5, 1989 now U.S. Pat. No. 5,013,699, which is in turn a continuation-in-part of application Ser. No. 178,901, filed Apr. 7, 1988, and now abandoned.
US Referenced Citations (15)
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
417611 |
Oct 1989 |
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Parent |
178901 |
Apr 1988 |
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