A kind of preparation method of composite modified Y molecular sieve

Abstract

A preparation method of composite modified Y molecular sieve. The preparation method of the composite modified Y molecular sieve includes exchanging the NaY molecular sieve slurry with the rare earth solution at 5-90°C and pH 3.0-7.0 for 0.1-1.0h, then mixing and stirring with the silicon-containing solution, stirring for 0.1-1.0h and then adding Soluble phosphorus-containing compounds are stirred, filtered, washed with water, dried, and roasted at 100-700°C and 100% water vapor for 0.1-3.0 hours; the roasted molecular sieve is exchanged with ammonium salt solution, filtered, washed with water, and dried to obtain a composite modified Y molecular sieve. The molecular sieve obtained by the method has good pore structure and pore size distribution, and at the same time, while increasing the silicon-aluminum ratio of the molecular sieve, the crystallization retention degree of the molecular sieve is improved, thereby improving the activity and hydrothermal stability of the molecular sieve.

Description

technical field [0001] The invention relates to the field of catalytic materials, in particular to a preparation method of a Y molecular sieve. technical background [0002] In recent years, with the increase in the difficulty of oil exploitation, the trend of heavy crude oil in the world is very obvious. Due to the decline in the demand for fuel oil, the raw oil is relatively heavier. While the quality of crude oil is getting heavier and worse, the world's demand for light oil products is increasing. The main method of processing heavy oil in my country is FCC processing technology. In the composition of FCC catalyst, the active component of molecular sieve has an important influence on the comprehensive reaction performance of the catalyst. [0003] To date, residue catalytic cracking has required Y zeolites with high activity, high hydrothermal stability, large pore structure and appropriate acid strength. The widely used molecular sieves in catalytic cracking catalysts...

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Problems solved by technology

This method adopts "two crossing and two baking", and the utilization rate of rare earth is low

[0016] The above-mentioned molecular sieves using the "two crossing and two baking" modification process have complex procedures, and the rare earths cannot be fully utilized, while the molecular sieves using the "one crossing and one baking" modification process mainly have the problem that the content of sodium oxide is higher than that of "two crossing and two baking". affect reactivity

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