Patent ID: 11964262
Assignee: RESEARCH INSTITUTE OF PETROLEUM PROCESSING, SINOPEC
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  Y | IPC B  C

Claim 0:
1. A modified molecular sieve having a MFI structure, comprising phosphorus, a supported metal M1, and a supported metal M2,
wherein the modified molecular sieve has:
a ratio of (SiO2)/(Al2O3) of more than 15 and less than 70,
a content of phosphorus, calculated as P2O5, of 1-15 wt % based on a dry weight of the modified molecular sieve,
a content of supported metal M1, calculated as oxide of the supported metal M1, of 1-10 wt %, based on the dry weight of the modified molecular sieve, and
a content of supported metal M2, calculated as oxide of the supported metal M2, of 0.1-5 wt %, based on the dry weight of the modified molecular sieve,
wherein the supported metal M1 is one or more selected from rare earth elements, and the supported metal M2 is one selected from iron, cobalt, nickel, copper, manganese, zinc, tin, bismuth and gallium,
wherein a volume of mesopores in the modified molecular sieve represents 40-70% by volume of a total pore volume of the modified molecular sieve, the volume of mesopores and the total pore volume of the modified molecular sieve are measured by a nitrogen adsorption BET specific surface area method, and the volume of mesopores is the pore volume of the pores having a diameter of more than 2 nm and less than 100 nm,
wherein the modified molecular sieve has a RE distribution parameter, D, which satisfies 0.9≤D≤1.3, wherein D=RE (S)/RE (C), RE (S) represents a content of rare earth in any region of more than 100 nm2 in a distance H inward from an edge of a crystal face of the molecular sieve crystal grain measured by a TEM-EDS method, and RE (C) represents a content of rare earth in any region of more than 100 nm2 in a distance H outward from a geometric center of the crystal face of the molecular sieve crystal grain measured by a TEM-EDS method, wherein H is 10% of the distance from a certain point on an edge of the crystal face to the geometric center of the crystal face.