MOLECULAR SIEVE HAVING MFI STRUCTURE AND HIGH MESOPORE CONTENT, METHOD FOR ITS PRODUCTION, CATALYST CONTAINING IT AND ITS APPLICATION Russian patent published in 2023 - IPC C01B39/38 C01B39/36 B01J29/40 C10G11/05 B01J21/04 B01J21/16 

FIELD: catalytic chemistry.

SUBSTANCE: molecular sieve of the present invention is used in catalytic cracking, has an MFI structure and a high mesopore content, in which there is a silicon component, an aluminium component, a phosphorus component, and a supported metal component, and the molecular sieve has a ratio of n(SiO₂)/n(Al₂O₃), which is more than 15 and less than 70; the molecular sieve has a content of phosphorus in terms of P₂O₅, comprising from 1 to 15 wt% in relation to the dry weight of the molecular sieve, while the molecular sieve has a supported metal content in terms of supported metal oxide, comprising from 1 to 10 wt.% in relation to the dry weight of the molecular sieve, and the supported metal is one or more metals selected from rare earth elements, and the mesopore volume in the molecular sieve is from 40 to 70% by volume in relation to the total pore volume of the molecular sieve, and the volume mesopore and total pore volume of a molecular sieve are measured by nitrogen adsorption to calculate Brunauer-Emmett-Teller (BET) specific surface area, and mesopore volume means the pore volume for pores having a diameter of more than 2 nm and less than 100 nm, wherein the molecular sieve has an RE distribution parameter D that satisfies the following conditions: 0.9≤ D ≤ 1,3, and D = RE(S)/RE(C), where RE(S) is the content of rare earth elements in any area that is more than 100 nm² and located at a distance H in the direction inward from the edge of the crystal face of the crystal molecular sieve grains as measured by Transmission Electron Microscopy-Energy Dispersive X-ray Spectroscopy (TEM-EDS), and RE(C) is the content of rare earth elements in any region greater than 100 nm² and located at a distance H outward from the geometric centre crystal face of a crystal grain of a molecular sieve as measured by TEM-EDS, wherein H is 10% of the distance from a certain point on the edge of the crystal face to the geometric centre of the crystal face. The invention also relates to a method for producing a molecular sieve, a catalyst containing a molecular sieve having an MFI structure and a high content of mesopores, a method for producing this catalyst, as well as a method for catalytic cracking of hydrocarbon oil using a catalyst.

EFFECT: it is possible to use the claimed molecular sieve in catalytic cracking processes, providing a high yield of ethylene and high selectivity with respect to ethylene.

27 cl, 11 tbl, 38 ex