METHOD OF PREPARING MICROSPHERICAL OIL FRACTION CRACKING CATALYST

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FIELD : petroleum processing and catalysts. SUBSTANCE : method consists in performing ion exchanges by rare-earth and ammonium cations on zeolite NaY, two-step ultrastabilization of zeolite in water steam medium, mixing zeolite with matrix components to form composition, and spray drying of resulting composition followed by calcination and preparation of catalyst. In the first stage, ultrastabilization of zeolite is conducted at 550-650°C and partial water steam pressure within a range 0.1 to 1.0 atm. In the second stage, ultrastabilization is performed after spray drying by calcination of composition at 650-750°C and partial water steam pressure within a range 0.05 to 0.3 atm. EFFECT : increased lattice module of zeolite and relative crystallinity resulting in increased catalytic activity. 6 cl, 1 tbl, 9 ex