Preparation method of hydrotreatment catalyst

Abstract

The invention discloses a preparation method of a hydrotreatment catalyst, comprising the following steps of: introducing silicon and boron additives in the way that an organic silicon source is added after aluminium hydroxide gel forming and then a boron-containing organic compound solution is added, so as to obtain silicon and boron containing aluminium hydroxide, mixing parts of an active metal component with boron-containing aluminium hydroxide by a kneading method, carrying out three-stage roasting to obtain a catalyst intermediate, loading residual part of the active metal onto the catalyst intermediate by dipping, and drying to obtain the hydrotreatment catalyst. By the adoption of the method provided by the invention, the silicon and boron additives and the active metal component are uniformly distributed on the surface of the catalyst. In addition, the active metal component has different existing forms in the catalyst when introduced in the two modes, loss rate of the catalyst activity is reduced by mutual cooperation, and running period of a device is prolonged. The catalyst has large pore volume, large specific surface area, appropriate pore structure and acidity, and is especially suitable for hydrodenitrogenation process of heavy hydrocarbon.

Description

technical field [0001] The invention relates to a preparation method of a hydrogenation treatment catalyst, in particular to a preparation method of a hydrogenation treatment catalyst with large pore volume and large specific surface area. Background technique [0002] At present, countries all over the world have increasingly stringent requirements on vehicle fuels, especially the content of sulfur, nitrogen and aromatics. However, as the amount of oil extracted increases, it becomes heavier and worse day by day, and the human demand for vehicle fuel continues to increase, which makes it more and more difficult for refineries to process oil. Among them, hydrogenation technology is one of the important technologies for producing qualified fuels. Under the above-mentioned background, the raw materials processed by this technology are also deteriorating and becoming heavier, which constantly puts forward new requirements for hydrogenation catalysts. [0003] Hydrogenation cat...

AI Technical Summary

Problems solved by technology

Adding an organic complexing agent in this method improves the stability of boron, but due to simultaneous impregnation with active metals, boron and active metals compete with the carrier for adsorption, which affects the dispersion of active metals on the carrier.

At the same time, the promotion effect of boron on the conversion of type I active phase to type II active phase with higher activity is bound to be weakened, which limits the improvement of the activity of this type of catalyst.

In addition, since boron is introduced after the alumina carrier is formed, it has little effect on the pore structure and channel of the alumina carrier, and does not play a role in pore expansion; the acid center type of the carrier is not adjusted before loading the active metal; It does not weaken the strong interaction between the active metal and the support, which reduces the activity of the catalyst