Gasoline hydrocracking catalyst and process
AssigneeUnion Oil Company of California
InventorJohn W. Ward
Life of this patent
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Abstract
A catalyst for use in acid catalyzed chemical conversion processes such as hydrocarbon conversion processes comprises zeolite beta and a dealuminated Y zeolite having an overall silica-to-alumina mole ratio greater than 6.0, preferably LZ-210 zeolite. A preferred catalyst contains nickel and molybdenum hydrogenation components in addition to the zeolite beta and the LZ-210 zeolite and, when used in gasoline hydrocracking, is found to be more active and selective for both light and heavy gasoline than a commercially available gasoline hydrocracking catalyst containing nickel and molybdenum hydrogenation components and a single steam-stabilized Y zeolite.
Claims46
A process for hydrocracking a hydrocarbon feedstock which comprises contacting said feedstock at a temperature between about 450.degree. F. and about 850.degree. F. and at a pressure between about 750 psig and about 3500 psig in the presence of hydrogen and in an atmosphere containing no more than about 200 ppmv ammonia with a catalyst comprising a hydrogenation component, zeolite Beta, and between about 15 and about 50 weight percent of a catalytically active dealuminated Y zeolite having a unit cell size between 24.40 and 24.63 angstroms, a sorptive capacity for water vapor at 25.degree. C. and 4.6 millimeters mercury water vapor partial pressure of at least about 20 weight percent, and an overall silica-to-alumina mole ratio greater than 6.0, wherein said dealuminated Y zeolite has (a) a composition expressed in terms of oxide mole ratios in the anhydrous state of
- (0.85-1.1)M.sub.2/n O:Al.sub.2 O.sub.3 :xSiO.sub.2
- wherein "M" is a cation having a valence of "n" and "x" has a value between 6 and about 20, (b) an X-ray powder diffraction pattern comprising at least the d-spacings set forth in Table 1 and (c) extraneous silicon atoms in the crystal lattice in the form of framework SiO.sub.4 tetrahedra.
A hydrocracking process which comprises contacting a hydrocarbon feedstock with a hydrocracking catalyst in the presence of added hydrogen at a temperature between about 450.degree. F. and about 850.degree. F. and at a pressure between about 750 psig and about 3500 psig in an atmosphere which contains no more than about 200 ppmv ammonia, wherein said catalyst comprises one or more hydrogenation components in combination with a support comprising an amorphous, inorganic refractory oxide binder, zeolite Beta in a form catalytically active for cracking hydrocarbons, and a dealuminated Y zeolite in a form catalytically active for cracking hydrocarbons, wherein said dealuminated Y zeolite (a) has an overall silica-to-alumina mole ratio greater than 6.0, a unit cell size between 24.40 and 24.63 angstroms and a sorptive capacity for water vapor at 25.degree. C. and 4.6 millimeters mercury water vapor partial pressure of at least about 20 weight percent, (b) is present in said catalyst in an amount between about 15 and about 50 weight percent of said catalyst, (c) has a composition expressed in terms of oxide mole ratios in the anhydrous state of
- (0.85-1.1)M.sub.2/n O:Al.sub.2 O.sub.3 :xSiO.sub.2
- wherein "M" is a cation having a valence of "n" and "x" has a value between 6 and about 20, (d) has an X-ray powder diffraction pattern comprising at least the d-spacings set forth in Table 1 and (e) has extraneous silicon atoms in the crystal lattice in the form of framework SiO.sub.4 tetrahedra.
A hydrocracking process for producing gasoline which comprises contacting a gas oil feedstock with a hydrocracking catalyst in the presence of added hydrogen at a temperature between about 450.degree. F. and about 850.degree. F. and at a pressure between about 750 psig and about 3500 psig in an atmosphere which contains no more than about 200 mmpv ammonia, wherein said catalyst comprises:
- (a) a hydrogenation component comprising a metal selected from Group VIB and/or Group VIII of the Periodic Table of Elements;
- (b) zeolite Beta in a form catalytically active for cracking hydrocarbons;
- (c) between about 15 and 50 weight percent of an LZ-210 zeolite having a silica-to-alumina mole ratio between 6 and about 15 in a form catalytically active for cracking hydrocarbons;
- and
- (d) an amorphous, inorganic refractory oxide binder.
Dependencies are inferred from the claim text.