Preparation method of hydrocracking catalyst

Abstract

The invention discloses a preparation method of a hydrocracking catalyst. The catalyst adopts amorphous silicon alumina as a carrier, adopts a Y-shaped molecular sieve as an acidic component, adopts VIB group metal and VIII group metal as hydrogenation active metal components, adopts IVB group metal as an additive, and is prepared by combining an acidic mixed solution A with the hydrogenation active metal, silicon, aluminium and the additive and a sodium meta-aluminate alkaline solution B, performing gel formation, and adding a suspension of the Y-shaped molecular sieve. The method of the invention can increase the pore volume and the specific surface area of the catalyst, improve the metal dispersiveness in the catalyst, and provide the catalyst with high hydrocracking activity, middle oil selectivity and stability.

Description

technical field [0001] The invention relates to a method for preparing a hydrocracking catalyst, in particular to a method for preparing a hydrocracking catalyst with high activity and high-medium oil selectivity containing modified Y-type molecular sieves. Background technique [0002] With the development of the world economy, the demand for middle distillate fuels in the transportation industry, which is driving the rapid economic development, is increasing, and the extraction of crude oil is also increasing day by day, becoming worse and heavier. At the same time, more and more attention has been paid to the harm of pollutants emitted by fuel combustion to the environment on which human beings depend, and stricter environmental protection regulations have also been introduced. This requires refineries to produce middle distillate oil products of good quality and quantity to meet the needs of social development. Hydrocracking can convert heavy oil into high-quality middl...

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Problems solved by technology

[0005] CN1253988A discloses a kind of nitrogen-resistant type prolific middle distillate hydrocracking catalyst, CN1253989A discloses a kind of heavy hydrocarbon hydrocracking catalyst and preparation method thereof, the used alkaline precipitant of these two preparation methods is all Ammonia, although a hydrocracking catalyst with ideal performance for the treatment of heavy hydrocarbons and prolific middle distillates can be obtained, there are no effective control measures for the pollution caused by ammonia nitrogen to the environment

[0006] CN1952057A discloses a method for preparing a hydrogenation catalyst composition. The aluminum source acting as a binder in the catalyst comes from aluminum chloride, aluminum sulfate, aluminum nitrate or aluminum acetate, etc., and the precipitant used is ammonia, which has the problem of ammonia nitrogen pollution.

[0007] What CN101172261A discloses is to adopt the method for preparing hydrogenation catalyst of sodium metaaluminate alkali solution precipitating agent, the aluminum that plays binding role in the catalyst all comes from sodium metaaluminate, the precipitation particle that forms in the precipitation process like this is bigger, and the specific surface area of ​​catalyst And the strength has decreased, which will affect the performance of the catalyst

[0008] CN101239324A discloses a method for preparing a high-activity, high-medium oil type hydrocracking catalyst by a co-gel method. The precipitant uses a weakly basic ammonia compound, and there is still the problem of ammonia nitrogen pollution

Co-precipitation method prepares catalysts in the process of forming precipitates or gels, although the properties such as particle size and pore structure have been basically established, but they are not stable. The heat treatment process is to maintain porosity, change pore distribution, form active phase and stabilize mechanical properties. The important link of strength, the above-mentioned patents are not involved in this

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