Preparation method of catalytic cracking catalyst

Abstract

The invention provides a preparation method of a catalytic cracking catalyst. The preparation method comprises the following steps: (1) synthesizing a catalyst precursor microsphere by adopting a semi-synthesis or total-synthesis method; (2) dissolving a compound containing group IIIB metal ions in a periodic table of elements into water or acid, so as to form a solution containing the group IIIB metal ions in the periodic table of element; mixing the solution with an organic complexing agent and / or a dispersant (a), a precipitating agent (b) and the catalyst precursor microsphere (c); stirring for at least 10min at a temperature of 5 DEG C to 100 DEG C, so as to form a catalyst precursor microsphere containing group IIIB element sediment; and (3) filtering mixed slurry of the catalyst precursor microsphere containing the group IIIB element sediment and drying to prepare the catalytic cracking catalyst containing the group IIIB element sediment. The catalyst prepared by the method disclosed by the invention can be used for effectively capturing heavy metal, and has a good heavy metal pollution resisting performance and relatively good activity and stability.

Description

technical field [0001] The invention relates to a preparation method of an oil refining catalyst, in particular to a preparation method of a catalytic cracking catalyst. 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, with a total processing capacity of ...

AI Technical Summary

Problems solved by technology

It has been found that rare earth ions exchange with cations such as sodium in molecular sieves, migrate into molecular sieves, and play a role in improving the activity and stability of molecular sieves. However, once the ion-exchanged rare earths come into contact with vanadium, they are easy to break away from the framework structure of molecular sieves and form vanadium Acidic rare earths, on the contrary, make the structural stability of molecular sieves worse; and rare earths that exist in the form of independent phases can be used to trap heavy metals in the process of catalytic cracking reaction due to their different positions and states, and play the role of anti-heavy metals

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

[0011] The above 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 relatively large, which is not conducive to uniform dispersion on the surface of the molecular sieve, and is also not conducive to effective interaction with heavy metals. Contact and capture heavy metals in time

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