A kind of hydrocracking catalyst and its preparation method and application

Abstract

The invention discloses a hydrocracking catalyst and a preparation method and application thereof. The method includes the following steps: (1) forming modified Y molecular sieve, amorphous silica-alumina and / or alumina, drying and calcining to obtain the catalyst carrier; the sodium content in the modified Y molecular sieve is 1 to 8 wt%; (2) the catalyst carrier prepared in step (1) by saturated impregnation with a non-polar organic solvent, and then dried to the non-polar catalyst carrier in the catalyst carrier The content of the organic solvent is 20-90% of the saturated adsorption capacity of the catalyst carrier. (3) The material obtained in step (2) is subjected to ammonium salt ion exchange, drying and calcination treatment; (4) active metal is introduced into the material obtained in step (3), and the final catalyst is obtained by drying and calcining. The catalyst prepared by the method can reduce the cracking of high value-added lubricating oil base oil to generate other low-value products, especially the excessive cracking of straight-chain paraffin high viscosity index components in the lubricating base oil.

Description

technical field [0001] The invention relates to a hydrocracking catalyst and its preparation method and application, in particular to a hydrocracking catalyst for high-quality lubricating oil base oil with high yield and its preparation method and application. Background technique [0002] The hydrocracking process includes two processes: cracking and hydrogenation. On the one hand, heavy feedstock 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 the hydrocracking catalyst, the hydrogenation activity and the cracking activity deployment method determine 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 components with molecular sieve, alumina, and amorpho...

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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