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 aluminum-based binder, a modified molecular sieve, clay and silica sol to obtain paste and carrying out spray drying and roasting to obtain the catalyst. The silica sol is alkaline silica sol modified by an acid and a modification method of the alkaline silica sol comprises adding an acid into the alkaline silica sol at a temperature of 0-30 DEG C along with stirring so that the uniform sol has pH of 1-5 and is acid-modified silica sol. A preparation method of the modified molecular sieve comprises adding water into a molecular sieve at a temperature of 0-30 DEG C along with stirring, beating the mixture, then adding an organic acid into the slurry along with stirring for aluminum removal modification, then adding a rare earth ion precipitating agent and a rare earth aqueous solution into the slurry together and carrying out uniform stirring to obtain the modified molecular sieve slurry. The catalyst has good coke selectivity and good anti-heavy metal performances.

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] 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 oxidized and highly m...

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Problems solved by technology

[0013] The invention discloses a preparation method of a silicon-based catalytic cracking catalyst, which solves the problem that acid silica sol, which is used as a catalytic cracking catalyst matrix, has poor stability and is difficult to store, and that the colloids existing in the alkaline silica sol in the process of preparing a silicon-rich catalytic cracking catalyst are easy to gel, In the process of preparing the catalyst, it is easy to lose fluidity. At the same time, the molecular sieve is modified by precipitation rare earth, and optimized from both the matrix and the active component, so that the prepared catalytic cracking catalyst has better coke selectivity and better resistance to heavy metals. performance

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