Modified Y catalyst containing rare earth and phosphorus

Abstract

The invention relates to the field of catalysts, and provides a fine-grain modified Y catalyst containing rare earth and phosphorus and a preparing method. Y-molecular-sieve raw powder before being modified is directly synthesized through a non-template agent, the average grain ranges from 400 nm to 700 nm, and the crystal reservation degree is larger than 90%. After Y-molecular-sieve constituent elements are subjected to ammonium exchanging, hydrothermal aging and ammonium-hexafluorosilicate dealumination and silicon reinsertion, the obtained molecular sieve and a rare-earth solution are subjected to an exchanging reaction, then a phosphorus compound is led into the exchanged slurry liquid, reacting is further carried out, the mixture is filtered and washed, and a filtered bake is roasted under the water vapor condition; the molecular sieve, aluminum oxide, clay, acid and water are pulped, mixed to be even, sprayed, formed and roasted, and then a microsphere with the bulk density of 0.6 g / mL to 0.9 g / mL is obtained. The fine-grain modified Y-molecular-sieve cracking catalyst containing rare earth and phosphorus prepared with the method has the high heavy-oil conversion capacity and the good coke selectivity.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a fine-grain modified Y catalyst containing rare earth and phosphorus. Background technique [0002] At the end of the 1950s, Milton and Breck successfully synthesized Y-type molecular sieves. Due to the structure of NaY molecular sieves, SiO 2 / Al 2 o 3 The ratio is greater than that of X-type molecular sieve, so that the thermal stability and hydrothermal stability are improved. In the early 1970s, Grace Company developed the directing agent method to synthesize NaY molecular sieves. The raw material was water glass instead of expensive silica sol. The process was simplified and the growth cycle was shortened, so that NaY molecular sieves were rapidly and widely used in petrochemical industries In the field of petroleum cracking catalysis so far, among the hundreds of molecular sieves that have been developed, Y molecular sieve is the most widely used in industry. At present, the s...

AI Technical Summary

Problems solved by technology

CN1382632A discloses a super-stabilizing method of fine-grained Y-type zeolite, which is obtained by contacting the dry gas of silicon tetrachloride with fine-grained NaY zeolite and washing it. Stability is just relatively poor, and this inventive method adopts the mode of vapor phase dealumination of silicon to process molecular sieve simultaneously, and this makes the thermal and hydrothermal stability of product worse, and activity is low; Small, high energy consumption and other disadvantages

This method can shorten the technological process of catalyst preparation, but the pore structure of the obtained cracking catalyst is not significantly improved, and the selectivity is poor

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