Hydrocracking catalyst and preparation method thereof

Abstract

The invention discloses a hydrocracking catalyst and a preparation method thereof. The hydrocracking catalyst comprises: a carrier composed of a modified beta molecular sieve, a modified Y type molecular sieve and alumina, and hydrogenation active metal components. Specifically, the modified beta molecular sieve is prepared by: subjecting a crystallized beta molecular sieve slurry directly to ammonium exchange and a template agent removal treatment, then first conducting a hydrothermal treatment, and performing an aluminum salt solution treatment, under the condition of maintaining a high beta molecular sieve crystallinity, removing part of non-framework aluminum uniformly, thus obtaining the beta molecular sieve with the characteristics of high Si / Al ratio, large specific surface area, appropriate acidity and acid distribution, and reasonable structure, etc. The modified beta molecular sieve especially has a suitable cracking effect and a very good isomerization effect on long-chain alkane and the long side chain alkyl of aromatic hydrocarbon and cyclane, and has a synergistic effect with the Y type molecular sieve, so that the hydrocracking catalyst can have very high catalytic activity and middle distillate selectivity. And the condensation point of diesel fraction is substantially reduced, and the product properties of middle distillate are improved.

Description

technical field [0001] The invention relates to a hydrocracking catalyst and a preparation method thereof, in particular to a hydrocracking catalyst which uses β molecular sieve and Y-type molecular sieve as main cracking components, has high catalytic activity and can produce high-quality middle distillate oil and its preparation method. Background technique [0002] In recent years, the demand for high-quality middle distillate products in oil markets around the world has been growing continuously. With the rapid development of economy, this contradiction between supply and demand has become more prominent. With its unique advantages, hydrocracking technology has become the best means for deep processing of heavy oil to produce high-quality clean middle distillate. [0003] At present, the activity of medium-oil hydrocracking catalysts in various countries in the world is not very high, and the freezing point of the obtained diesel oil is also high, which is difficult for...

AI Technical Summary

Problems solved by technology

The method is to burn the original powder of the β molecular sieve to remove the template agent, which will greatly reduce the crystallinity of the molecular sieve, and also affect the acidity of the molecular sieve. In combination with other components, the catalytic activity of the catalyst is not high. The product quality of middle distillates is average and needs to be further improved