Catalytic cracking catalyst and its prepn

Abstract

A catalytic cracking catalyst and a preparation method thereof. The catalyst contains 10-40% by weight of medium and macroporous alumina, 15-40% by weight of zeolite, 10-20% by weight of binder, and 10-65% by weight of clay. The average pore diameter of macroporous alumina is not less than 3 nanometers. The preparation method of the catalytic cracking catalyst is to mix zeolite with medium and macroporous alumina, binder precursor and clay evenly, and then spray, roast, wash and dry be made of. Compared with conventional catalysts, the catalyst has enhanced heavy oil conversion capability, significantly improved gasoline and coke selectivity, and enhanced ability to resist heavy metal nickel.

Description

technical field [0001] The invention relates to a catalytic cracking catalyst, in particular to a catalytic cracking catalyst containing medium and macroporous alumina. Background technique [0002] For the petroleum refining industry, high bottom oil conversion, high gasoline and low coke selectivity are always the goals pursued by catalytic cracking unit production. By improving the properties of zeolite and matrix, the catalytic cracking catalyst is adapted to the requirements of the above objectives. For quite a long time in the past, the improvement of zeolite has always been dominant. In recent years, with the increasingly heavy feed oil (high boiling point components >500 °C increase), inferior quality and the development of catalytic cracking process, the matrix The role is becoming more and more prominent, requiring the matrix of the catalyst to have medium and large pores and a certain activity, thereby improving the ability to crack heavy oil; at the same time...

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Problems solved by technology

[0005] Although the above-mentioned patents use acid-base modified clay as a matrix component to improve properties such as matrix pore structure, it has many advantages, but there are problems of corrosion equipment and complicated modification process; acid-soluble alumina has better bonding properties and It has a certain activity, but there is a problem of acid corrosion to the equipment. At the same time, the acid treatment makes the pores of the alumina itself all or partly fused, so that the proportion of medium and large pores that are conducive to the entry of raw oil macromolecules is reduced, and the pore structure of the catalyst matrix cannot be improved. It is easy to make the coke selectivity of the cracking reaction worse; the technology of preparing the catalyst by pre-treating alumina with phosphide makes the process complicated

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