Catalytic cracking catalyst containing modified molecular sieve and preparation method of catalytic cracking catalyst

Abstract

The invention relates to a catalytic cracking catalyst containing modified molecular sieve and a preparation method of the catalytic cracking catalyst. The catalytic cracking catalyst with the mass being 100% comprises, 10-55% of modified molecular sieve by dry basis, 10-80% of clay by dry basis, 0-40% of inorganic oxide in terms of its oxide and 5-40% of binder in terms of its oxide. The preparation method of the modified molecular sieve includes: mixing molecular sieve slurry, compound solution containing metal ions of element periodic table IIIB, precipitator and organic complexing agent and / or dispersing agent, stirring under 5-100 DEG C for at least 10 minutes to obtain mixed slurry of molecular sieve and precipitation containing metal of the element periodic table IIIB, drying, and roasting or not to obtain the molecular sieve modified by the elements of the element periodic table IIIB. The catalytic cracking catalyst is good in activity stability and heavy metal pollution resistance.

Description

technical field [0001] The invention relates to a catalytic cracking catalyst, in particular to a catalytic cracking catalyst with excellent activity stability and anti-heavy metal pollution performance. Background technique [0002] Crude oil is increasingly heavy and inferior. Efficient processing of heavy oil and blending of residual oil has become an urgent need for refiners to improve processing capacity and obtain higher profits. Catalytic cracking is the most important process of heavy oil processing. Due to its significant advantages such as high conversion efficiency of heavy oil, good product quality, non-hydrogenation and low operating pressure, it occupies a pivotal position in the process of processing heavy oil in refineries. It is the refinery's profit main source of . According to statistics, there are currently about 420 sets of catalytic cracking units in the world. The largest single set of catalytic cracking units has reached 10 million tons per year, wi...

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Problems solved by technology

It has been found that the ion exchange between rare earth ions and cations such as sodium of the molecular sieve, and migration into the molecular sieve can improve the activity and stability of the molecular sieve, but once the ion-exchanged rare earth contacts with vanadium, it is easy to break away from the framework structure of the molecular sieve and form rare earth vanadate. On the contrary, the structural stability of the molecular sieve is deteriorated; and the rare earth existing in the form of an independent phase can be used to trap heavy metals in the catalytic cracking reaction process and play an anti-heavy metal role due to the difference in the location and state of existence.

Therefore, the above-mentioned rare earth molecular sieve prepared by rare earth ion exchange does not contain rare earth in independent phase, so its ability to resist heavy metal pollution is insufficient

[0010] The rare earth-containing Y-type molecular sieve prepared by the precipitation method, even if a rare earth precipitate is formed and contains a separate phase of rare earth, the particles of the rare earth precipitate are large, which is not conducive to uniform dispersion on the surface of the molecular sieve, and is not conducive to effective contact with heavy metals. , Capture heavy metals in time

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