A kind of molecular sieve containing phosphorus and loaded metal imf structure and preparation method thereof

Abstract

The invention discloses a phosphorus-containing and supported-metal-containing IMF structure molecular sieve and a preparation method thereof, wherein the Al distribution parameter D of the molecularsieve is more than or equal to 0.6 and is less than or equal to 0.85, the volume of the mesopores of the molecular sieve accounts for 50-80% of the total pore volume, the volume of the mesopores withthe pore size of 2-20 nm accounts for more than 85% of the total mesopore volume, the amount of the strong acid of the molecular sieve accounts for 50-80% of the total acid amount, a ratio of the acidB to the acid L is 7-30, the phosphorus content (calculated as P2O5) of the molecular sieve is 0.1-15 wt% by using the dry base weight of the molecular sieve as the reference, and the supported metalcontent (calculated as the oxide of the supported metal) of the molecular sieve is 0.1-5 wt% by using the dry base weight of the molecular sieve as the reference. According to the present invention,the phosphorus-containing and supported-metal-containing IMF structure molecular sieve has advantages of high propylene yield, good propylene selectivity, high ethylene yield and high BTX yield in thecatalytic cracking reaction of petroleum hydrocarbons.

Description

Technical field [0001] The invention relates to a molecular sieve containing phosphorus and a loaded metal IMF structure and a preparation method thereof. Background technique [0002] For a long time, ethylene, propylene and butene have been the basic organic chemical raw materials for synthetic resins, synthetic fibers and synthetic rubber. Among them, propylene is an important raw material for the manufacture of petrochemical products after ethylene. At present, the largest source of propylene at home and abroad is the main by-product of thermal cracking of ethylene. Almost all of the second largest source of propylene comes from FCC units, which provide about 30% of the demand. In the United States, FCC units provide petrochemical products to propylene. About half of the demand. [0003] Due to the rapidly growing demand for polypropylene, petrochemicals require propylene faster than ethylene, and the construction of ethylene plants is limited by the demand for ethylene. There...

AI Technical Summary

Problems solved by technology

[0005] Although IM-5 molecular sieve can have high alkane cracking ability, it is the same as other ten-membered ring molecular sieves. Due to its narrow pore structure, it is difficult for larger reactant molecules such as polycyclic hydrocarbons to enter the crystal pore for reaction, reducing the The effective reaction area of ​​the molecular sieve reduces the reactivity of the molecular sieve; on the other hand, larger product molecules such as isoparaffins and aromatics are not easy to diffuse out of the pores of the molecular sieve, which causes secondary reactions such as excessive hydrogen transfer and coking, which lead to Molecular sieve deactivation, reduced reaction selectivity