Catalysts over steam activated zeolite catalyst
AssigneeMobil Oil Corporation
InventorDavid S. Shihabi
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Abstract
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. Preferred zeolites have a Constraint Index of 1 to 12.
Claims16
A process for catalytically cracking a hydrocarbon feedstock to a conversion product comprising hydrocarbon compounds of lower molecular weight than said feedstock hydrocarbon compounds, which process comprises contacting said feeedstock at cracking conditions with a catalyst composition prepared by the method which comprises forming a composite of a crystalline aluminosilicate zeolite having a silica:alumina ratio of at least about 250:1 and a Constraint Index from 1 to 12, a binder that contains alumina, and water, and contacting the composite with steam for at least one hour by heating the composite in the presence of water at a temperature from about 300.degree. to 500.degree. C. such that the pressure during steaming ranging between about 100 to 500 kPa, to enhance the activity of the catalyst.
A process for catalytically dewaxing wax-containing hydrocarbon feedstock to provide a catalytically dewaxed oil with reduced pour point, which process comprises contacting said feedstock at catalytic dewaxing conditions with a catalyst composition prepared by the method which comprises forming a composite of a crystalline aluminosilicate zeolite having a silica:alumina ratio of at least about 250:1 and a Constraint Index from 1 to 12, a binder that contains alumina, and water, and contacting the composite with steam for at least one hour by heating the composite in the presence of water at a temperature from aobut 300.degree. to 500.degree. C. such that the pressure during steaming ranges between aobut 100 to 500 kPa, to enhance the acityity of the catalyst.
A process for catalytically hydrodewaxing a wax-containing lubricating oil base stock to provide a catalytically hydrodewaxed lubricating oil stock with reduced wax content which comprises contacting said base stock at catalytic hydrodewaxing conditions in a reaction zone in the presence of hydrogen with a catalyst composition prepared by the method which comprises forming a composite fo a crystalline aluminosilicate zeolite having a silica:alumina ratio of at least about 2050:1 and a Constraint Index from 1 to 12, a binder that contains alumina, and water, and contacting the composite with steam for at least one hour by heating the composite in the presence of water at a temperature from about 300.degree. to 500.degree. C. such that the pressure during steaming ranges between aobut 100 to 500 kPa, to enhance the activity of the catalyst.
Dependencies are inferred from the claim text.