MODIFIED Y-TYPE MOLECULAR SIEVES, CATALYTIC CRACKING CATALYST CONTAINING THEM, CATALYST PRODUCTION AND APPLICATION OF SIEVES Russian patent published in 2023 - IPC C01B39/24 B01J29/08 B01J35/10 B01J37/30 C10G11/05 

FIELD: molecular sieves and catalytic cracking.

SUBSTANCE: group of inventions relates to a modified Y-type molecular sieve, a catalytic cracking catalyst containing it, its production and their use. A modified Y-type molecular sieve is presented, having a modifying metal content of 0.5-6.3 wt.% in terms of modifying metal oxide and the sodium content is not more than 0.5 wt.% in terms of sodium oxide in terms of dry matter and based on the weight of the specified modified Y-type molecular sieve, and the specified modifying metal is magnesium and/or calcium, and the modified Y-type molecular sieve comprises aluminium and silicon, has the ratio of the content of non-lattice aluminium to the total aluminium content not more than 20% and has a ratio of silicon dioxide-alumina in the crystal lattice, calculated as the molar ratio of SiO₂/Al₂O₃ equal to 7.3-14, the total pore volume is 0.33-0.39 ml/g, the ratio of the volume of secondary pores with a pore size of 2-100 nm to the total pore volume of 10-25%, the crystal lattice constant is 2.440-2.455 nm, the temperature of destruction of the crystal lattice is not lower than 1040° C and the ratio of B acid to L acid in the total acid content is not less than 2.30, as determined by infrared spectroscopy of adsorbed pyridine at 200°C. In another embodiment, a method for producing a modified Y-type molecular sieve is provided comprising the steps of: (1) contacting a NaY type molecular sieve with a solution of a soluble magnesium salt and/or a soluble calcium salt for an ion exchange reaction to obtain Y type molecular sieve containing magnesium and/or calcium, with a reduced sodium content; (2) subjecting the Y-type molecular sieve obtained in step (1) to calcination at a temperature of 350-480°C in an atmosphere of 30-90 vol.% steam for 4.5-7 hours and optionally drying to obtain a Y-type molecular sieve with a reduced constant crystal lattice; and (3) contacting the reduced lattice constant Y-type molecular sieve with gaseous silicon tetrachloride to react at a weight ratio of SiCl₄ to reduced lattice constant Y-type molecular sieve, on a dry matter basis, from 0.1:1 to 0.7 :1 and reaction temperature 200-650°C for a reaction time of 10 minutes to 5 hours to obtain a modified molecular sieve type Y. A catalytic cracking catalyst is presented containing 10-50 wt.% in terms of dry matter of the modified molecular sieve type Y, 10-40 wt.% binder based on aluminium oxide in terms of aluminium oxide and 10-80 wt.% in terms of dry matter of clay in terms of the weight of the catalytic cracking catalyst, and the use of a modified molecular sieve type Y in the catalytic cracking of hydrocarbon oils is presented, providing for the contact of a hydrocarbon oil with a catalytic cracking catalyst containing a modified molecular sieve type Y.

EFFECT: making a modified Y-type molecular sieve, which has high crystallinity, high thermal and hydrothermal stability, a certain secondary pore structure, uniform distribution of aluminium, and less non-lattice aluminium.

15 cl, 10 tbl, 50 ex