Hydrocracking catalyst as well as preparation method and application thereof

Abstract

The invention discloses a hydrocracking catalyst as well as a preparation method and application thereof. The method comprises the following steps: (1) molding a modified Y molecular sieve, amorphous silica-alumina and / or aluminum oxide, drying and roasting the molded mixture to obtain a catalyst carrier, wherein the content of sodium in the modified Y molecular sieve is 1-8wt%; and (2) carrying out saturated impregnation on the catalyst carrier prepared in the step (1) by adopting a non-polar organic solvent, and then carrying out drying treatment until the content of the non-polar organic solvent in the catalyst carrier is 20-90% of the saturated adsorption capacity of the catalyst carrier. (3) performing ammonium salt ion exchange, drying and roasting treatment on the material obtained in the step (2); and (4) introducing active metal into the material obtained in the step (3), and drying and roasting the materials to obtain the final catalyst. The catalyst prepared by the method can reduce cracking of high value-added lubricating oil base oil to generate other low-value products, and especially reduce excessive cracking of straight-chain alkane high-viscosity index components in the lubricating oil base oil.

Description

technical field [0001] The invention relates to a hydrocracking catalyst and its preparation method and application, in particular to a prolific high-quality lubricating oil base oil hydrocracking catalyst and its preparation method and application. Background technique [0002] The hydrocracking process includes two processes of cracking and hydrogenation. On the one hand, heavy crude oil is cracked and converted into light distillate components, and on the other hand, hydrogenation is carried out while cracking to improve product quality. For hydrocracking catalysts, the allocation method of hydrogenation activity and cracking activity determines the reaction characteristics and performance of the catalyst. [0003] At present, the preparation methods of hydrocracking catalysts are mainly divided into two categories: kneading method and impregnation method. The kneading method is to mix the active metal component with molecular sieve, alumina and amorphous silicon-aluminu...

AI Technical Summary

Problems solved by technology

Regardless of whether the catalyst is prepared by the kneading method or the impregnation method, the hydrogenation activity and cracking activity of different parts inside and outside the catalyst are evenly distributed. The current preparation method cannot realize the differential matching of the hydrogenation activity and cracking activity inside and outside the catalyst.

[0004] U.S. Patent No. 5,229,347 provides a method for preparing a moderate hydrocracking catalyst. The prepared catalyst uses a combination of VIB and VIII as the active metal component, and introduces the metal component by impregnation. Realize the differential matching of catalyst internal and external hydrogenation activity and cracking activity

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