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Zeolite activation
| Details |
Inventors: Shihabi, David S.;
Assignee: Mobil Oil Corporation (New York, NY)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
The activity of a zeolite catalyst is enhanced by forming the catalyst into a composite with a binder such as alumina and steaming the composite. The zeolites have a Constraint Index of 1 to 12 and a silica:alumina ratio of at least 12 and ZSM-5 is preferred. The enhancement of the activity is greatest at the high silica:alumina ratio, especially at ratios above 1200. |
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DETAILED DESCRIPTION I claim: 1.
A method of producing an improved catalyst, which method comprises forming a composite of a crystalline aluminosilicate zeolite having a silica:alumina ratio of at least 100 and a Constraint Index from 1 to 12, a binder that contains alumina, and water, and contacting the composite with steam to enhance the activity of the catalyst.
2.
The method described in claim 1 in which the zeolite has a silica:alumina ratio of at least about 250.
3.
The method described in claim 2 in which the zeolite has a silica:alumina ratio of at least 1200.
4.
The method described in claim 1 in which the zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35 and ZSM-38.
5.
The method described in claim 2 in which the zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35 and ZSM-38.
6.
The method described in claim 3 in which the zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35 and ZSM-38.
7.
The method described in claim 1 in which the zeolite is in the as-synthesized or in the hydrogen form and the composite is formed by mulling the zeolite and the binder together in the presence of water and forming catalyst particles by extruding the mulled wet mixture.
8.
The method described in claim 7 in which the zeolite is ZSM-5 having a silica:alumina ratio of at least about 250 and the binder is alumina.
9.
The method described in claim 8 in which the ZSM-5 is in the hydrogen form during the contact with the steam or a form which is at least partly converted to the hydrogen form by contact with the steam.
10.
A catalyst composition of enhanced activity prepared by the method of any of claims 1 to 9.
11.
A method for enhancing catalytic cracking activity of a high-silica ZSM-5 type crystalline zeolite which comprises mixing said zeolite with a binder that contains alumina, and contacting the mixture of zeolite and binder with water at elevated temperature under conditions effective to increase catalytic activity of said mixture
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