Hydrocracking catalyst and preparation method thereof

Abstract

The invention discloses a hydrocracking catalyst and a preparation method thereof. In the catalyst, the acidic component is a silicotungstate, the hydrogenation metal component is nickel, and the carrier is silicon oxide. The catalyst is prepared by: adding a nickel salt and an alkali metal salt respectively into an aqueous solution containing organic acid I to obtain a solution A, adding a silicon source into a solution containing organic acid II to obtain a solution B, then mixing the solution A with the solution B, adding a silicotungstic acid aqueous solution, conducting stirring to evaporate the solution, and carrying out drying and roasting, thus obtaining the catalyst. The heteropolyacid used by the method is silicotungstic acid, and two organic acids are used cooperatively to reach a mutual promotion effect, so that the metal components and the acidic component are dispersed more evenly, the hydrogenation activity and the acid function are matched better, and also the catalyst can have larger specific surface area, pore size and pore volume. Thus, the catalyst has better catalytic performance. The catalyst prepared by the invention is especially suitable for a hydrocracking reaction of long chain alkane.

Description

technical field [0001] The invention relates to a hydrocracking catalyst and a preparation method thereof, in particular to a long-chain alkane hydrocracking catalyst free of presulfurization and high activity and a preparation method thereof. Background technique [0002] In the oil refining industry, hydrocracking is an important process for producing high-quality light oil products from heavy oil. A transformation process of chemical reactions such as rearrangement and cleavage. The hydrocracking process can not only produce high-quality light oil products, but also has a high yield of liquid phase products. The core of its technology is the catalyst. The hydrocracking catalyst is a dual-function catalyst, which has both the acid function and the hydrogenation function. The acid function of the hydrocracking catalyst involved in US 5,536,687, US 5,447,623 and EP0028938A1 is mainly provided by molecular sieves, and the hydrogenation component is selected from Mo-Ni or W-...

AI Technical Summary

Problems solved by technology

Although the catalyst containing cesium phosphotungstate salt has good hydrocracking reaction activity, due to the strong acidity of phosphotungstic acid, after adding it in the catalyst preparation process, it has a great impact on the formation of carrier silicon oxide. When the cesium phosphotungstate content is high, the specific surface area, pore volume and pore diameter of the catalyst are relatively small, which affects the hydrocracking reaction activity of the catalyst