Faujasite zeolite, its preparation and use in hydrocracking
AssigneeShell Oil Company
InventorsEdward Julius Creyghton, Laurent Georges Huve, Aan Hendrik Klazinga
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Abstract
The invention provides a zeolite of the faujasite structure which has a unit cell size in the range of from 24.40 to 24.50 Å; a bulk silica to alumina ratio (SAR) in the range of from 5 to 10; and an alkali metal content of less than 0.15 wt %. Such zeolites have been found to have a very useful naphtha selectivity in hydrocracking, particularly a selectivity to heavy naphtha. A preparation process for the zeolite, hydrocracking catalyst composition comprising the zeolite and its use in hydrocracking are also provided.
Claims21
A process for the preparation of a zeolite, useful as a component of a naphtha-selective hydrocracking catalyst composition, wherein said process comprises:
- a) providing a starting zeolite of the faujasite structure having a silica to alumina ratio of from 4.5 to 6.5 and an alkali level of less than 1.5% wt;
- b) hydrothermally treating said starting zeolite at a temperature in the range of from 550 to 850° C. and at a partial pressure of steam in the range of from 0 to 100 vol %, basis total gas present, for a time effective to produce a intermediate zeolite having a unit cell size of from 24.35 to 24.50 Å;
- c) contacting the intermediate zeolite with an acidified solution comprising an acid under conditions effective to produce a zeolite having a unit cell size in the range of from 24.40 Å to 24.50 Å;
- a bulk silica to alumina ratio (SAR) in the range of from 7.5 to 9.0;
- and an alkali metal content of less than 0.15 wt %;
- and
- d) recovering said zeolite.
A naphtha-selective hydrocracking catalyst composition, which comprises a zeolite, a binder, and a metal hydrogenation component wherein said zeolite is of the faujasite structure which has a unit cell size in the range of from 24.40 to 24.50 Å;
- a bulk silica to alumina ratio (SAR) in the range of from 7.5 to 9.0;
- and an alkali metal content of less than 0.15 wt %.
A catalyst composition useful as a naphtha-selective hydrocracking catalyst, wherein said catalyst composition comprises:
- a zeolite of the faujasite structure that is present in said catalyst composition in the range of from 2 to 80% by weight, based on the total catalyst composition, and having a unit cell size in the range of from 24.40 to 24.50 Å and a bulk silica to alumina ratio (SAR) in the range of from 5 to 10;
- and an amorphous binder component, wherein said zeolite has an alkali metal content of less than 0.15 wt % based on the zeolite, and wherein said zeolite has a surface area in the range of from 650 to 900 m2/g;
- and at least one hydrogenation component, wherein said at least one hydrogenation component is a metal compound of metals selected from Group VIB metals and Group VIII metals, wherein said catalyst composition contains from 2 to 40 parts by weight Group VTB metal(s), calculated as metal per 100 parts by weight of the total catalyst composition, and from 0.05 to 10 parts by weight Group VIII metal(s), calculated as metal per 100 parts by weight of the total catalyst composition, wherein the unit cell size of said zeolite is in the range of from 24.44 to 24.48.
Dependencies are inferred from the claim text.