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

摘要

The present invention relates to a mesopore-rich rare earth- and phosphorus-containing MFI structured molecular sieve, 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} has; 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 % supporting metal M1 and 0.1-5 wt % supporting metal M2, based on the dry weight of the molecular sieve, wherein the supporting metal M1 is selected from lanthanum and cerium and the supporting metal M2 is one selected from iron, cobalt, nickel, copper, manganese, zinc, tin, bismuth and gallium; The volume of mesopores of the molecular sieve represents 40-70% by volume of the total pore volume of the molecular sieve. The MFI structure molecular sieve, upon catalytic cracking of petroleum hydrocarbons, exhibits excellent yields of ethylene and at the same time causes high yields of propylene and BTX. Another object of the present invention is to provide a catalyst containing a mesopore-rich rare earth- and phosphorus-containing MFI structure molecular sieve and a method for preparing the same.