Hydrocracking catalyst for hydrocarbon oil, method for producing hydrocracking catalyst, and method for hydrocracking hydrocarbon oil with hydrocracking catalyst
The present invention relates to a hydrocracking catalyst for hydrocarbon oil comprising a support containing a framework-substituted zeolite-1 in which zirconium atoms and/or hafnium atoms form a part of a framework of an ultrastable y-type zeolite and a hydrogenative metal component carried thereon and a method for producing the same. The hydrocracking catalyst of the present invention makes it easy to diffuse heavy hydrocarbon oils such as VGO, DAO and the like into mesopores, is improved in a cracking activity and makes it possible to obtain a middle distillate at a high yield as compared with catalysts prepared by using zeolite comprising titanium and/or zirconium carried thereon.
1. A method for producing a hydrocracking catalyst for hydrocarbon oil, the hydrocracking catalyst including a hydrogenative component carried on a support containing a framework-substituted zeolite-1 that contains
zirconium atoms and/or hafnium atoms substituting a part of aluminum atoms forming a framework of an ultra-stable Y-type zeolite,
wherein the zeolite-1 is obtained by:
firing an ultra-stable Y-type zeolite at 500° C. to 700° C., the ultra-stable Y-type zeolite having a crystal lattice constant falling in a range of 2.430 or more and 2.450 nm or less, a specific surface area of 600 to 900 m 2 /g, and a molar ratio of SiO 2 to AI 2 O 3 of 20 to 100;
forming a suspension containing the fired ultra-stable Y-type zeolite, the suspension having a liquid/solid mass ratio of 5 to 15;
adding inorganic acid or organic acid so that a pH of the above suspension is 1.0 to 2.0,
subsequently adding a zirconium compound, forming a mixture therefrom and neutralizing the said mixture.
2. The method for producing a hydrocracking catalyst for hydrocarbon oil according to claim 1 , wherein the zeolite-1 is obtained by firing at 500 to 700° C., an ultra-stable Y-type zeolite having a crystal lattice constant falling in a range of 2.430 nm or more and 2.450 nm or less, a specific surface area of 600 to 900 m 2 /g and a molar ratio of 20 to 100 in terms of SlO 2 to AI 2 O 3 , preparing a suspension having a mass ratio of 5 to 15 in terms of liquid/solid from the above fired ultra-stable Y-type zeolite, adding an inorganic acid or an organic acid thereto so that a pH of the above suspension is 1.0 to 2.0, subsequently adding a zirconium compound and/or a hafnium compound and a titanium compound forming a mixture therefrom and neutralizing the said mixture.