Mesopore-rich MFI structure molecular sieve, method for preparing same, catalyst containing same, and use thereof

摘要

The present invention relates to a mesopore-rich MFI structured molecular sieve, and a method for preparing the same, wherein the molecular sieve has a ratio _{of n(SiO 2} )/n(Al ₂ O _{3 ) greater than 15 and less than 70;} The molecular sieve has a phosphorus content of 1-15 wt%, calculated as _{P 2} O ₅ , based on the dry weight of the molecular sieve; the molecular sieve has a supporting metal content of 1-10 wt%, based on the dry weight of the molecular sieve, wherein the supporting metal is one or two selected from lanthanum and cerium; The volume of mesopores of the molecular sieve represents 40-70% by volume of the total pore volume of the molecular sieve, and the volume and total pore volume of the mesopores of the molecular sieve are measured by nitrogen adsorption BET specific surface area method, By volume of pores is meant the pore volume of pores having a diameter greater than 2 nm and less than 100 nm. Another object of the present invention is to provide a catalyst containing a mesopore-rich MFI structure molecular sieve and a method for preparing the same. The molecular sieve provided by the present invention has better ethylene selectivity in the catalytic cracking reaction of petroleum hydrocarbons.