Hydrocracking catalyst and preparation method thereof

Abstract

The invention discloses a hydrocracking catalyst and a preparation method thereof, which relate to a hydrocracking catalyst, in particular a hydrocracking catalyst for long-chain alkane. The invention provides a hydrocracking catalyst with high selectivity and a preparation method thereof. The hydrocracking catalyst comprises an acidic component and a hydrogenation component, wherein the acidic component is cesium phosphotungstate, the hydrogenation component is nickel, and the mole ratio of the hydrogenation component to the acidic component is between 8 and 24. The preparation method comprises the following steps: mixing a water-soluble cesium salt, a water-soluble nickel salt and a complexing agent to prepare mixed solution according to the mole ratio of 1:(8-48):(16-96); adding phosphotungstic acid to the mixed solution according to the mole ratio of the cesium salt to the phosphotungstate acid being 1:(0.5-1); and stirring the mixture until glue is formed; drying and baking the glue to prepare the hydrocracking catalyst. The conversion ratio obtained when the catalyst is applied to a hydrocracking reaction and the C5 selectivity of a cracked product reach more than 80 percent. Compared with other catalysts, the hydrocracking catalyst improves the C5 selectivity obviously under the same reaction condition.

Description

technical field [0001] The invention relates to a catalyst, especially a hydrocracking catalyst for long-chain alkanes. 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 depletion and cracking. 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 hydrocracking technology is the catalyst, and the hydrocracking catalyst is a dual-function catalyst, which has both acidic function and hydrogenation function. The acid function of the hydrocracking catalyst involved in US 5,536,687, US 5,447,623 and European EP 0028938A1 is mainly provided by molecular sieves, and the hydrogenation component is selected from Mo~Ni or W~Ni; the phosphorus-containing tungsten involved in CN100450612C Heteropolyacid or silicotungstic heteropolyac...

AI Technical Summary

Problems solved by technology

The hydrocracking catalyst containing molecular sieve has the advantages of strong acidity and large specific surface, but its disadvantage is that the small pore size of molecular sieve increases the diffusion resistance of reactants and products, and the probability of secondary cracking reaction increases

The hydrocracking catalyst containing phosphotungstic acid has the advantages of strong acidity and large pore size, but its disadvantage is that phosphotungstic acid has good water solubility and is easy to lose, and because of its strong acidity, it increases the possibility of secondary cracking reactions