A kind of preparation method of silicon-based catalytic cracking catalyst

Abstract

The invention discloses a preparation method of a silicon-based catalytic cracking catalyst. The preparation method comprises mixing and beating an Al-based binder, a modified molecular sieve, clay and silica sol, and carrying out spray drying and roasting to obtain the catalyst. The silica sol is acid-modified alkaline silica sol and under modification conditions of stirring and a temperature of 0-30 DEG C, an acid is added into the alkaline silica sol and the mixture is uniformly mixed until sol pH is in a range of 1-5 so that the acid-modified alkaline silica sol is obtained. Under modification conditions of stirring and a temperature of 0-30 DEG C, water is added into a molecular sieve, the mixture is beat to form slurry, an organic acid is added into the slurry for Al removal modification, a rare earch solution is added into the slurry and the mixture is uniformly mixed to form the modified molecular sieve slurry. The catalyst has the advantages of coke selectivity and heavy metal resistance.

Description

technical field [0001] The invention relates to a preparation method of a catalytic cracking catalyst, in particular to a preparation method of a silicon-based catalytic cracking catalyst. Background technique [0002] Fluid Catalytic Cracking (FCC for short) process is the main process of secondary processing of crude oil, an important means of deep processing of heavy oil, and one of the main sources of economic benefits of various refineries. As the world's petroleum resources continue to become heavy and inferior, blending heavy oil and residual oil in the catalytic cracking process has become a common processing method for refineries in various countries. Heavy oil contains more asphaltenes, colloids and heavy metals, especially vanadium and nickel are high in heavy metals. In the cracking reaction, heavy metals such as vanadium and nickel are deposited on the surface of the catalyst, resulting in a decrease in catalyst activity, especially vanadium, which is highly ox...

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Problems solved by technology

[0013] The invention provides a method for preparing a silicon-based catalytic cracking catalyst, which solves the problem that acid silica sol, which is used as a catalyst matrix for catalytic cracking, has poor stability and is not easy to store. During the catalyst process, it is easy to lose fluidity. At the same time, the molecular sieve is modified with rare earth, and optimized from the two aspects of matrix and active components, so that the prepared catalytic cracking catalyst has better coke selectivity and better resistance to heavy metals.

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