A kind of preparation method of hydrotreating catalyst

Abstract

The invention discloses a preparation method of a hydro-treatment catalyst. The preparation method comprises the following steps: preparing an alumina carrier, preparing an impregnation solution containing the VIII group metal and VIB group metal, wherein the impregnation solution comprises a proper amount of an organic auxiliary agent containing chelating ligand, then impregnating the alumina carrier into the impregnation solution under a proper ultrasonic treatment condition, and drying so as to obtain the hydro-treatment catalyst. The preparation method utilizes the ultrasonic cavitation effect to properly reduce the viscosity of the impregnation solution; at the same time the complexing capacity between the chelating ligand in the organic auxiliary agent and nickel / cobalt is improved by the catalytic function of the ultrasonic, the interaction force between the chelating ligand and nickel / cobalt is strengthened, thus the active metal component is promoted to highly disperse on the carrier surface, furthermore, the existing state of the active metal on the catalyst surface is improved at the same time, the sulfurization degree and sulfurization uniformity of the active metal are both improved, so the activity and stability of the catalyst are both improved. The catalyst is especially suitable for being used in the hydro-denitrogenation process and hydro-desulfurization process of heavy distillate oil.

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 suitable for heavy distillate oil hydrodenitrogenation and desulfurization processes. Background technique [0002] The content of impurities such as nitrogen, sulfur, oxygen and metals in crude oil is constantly increasing, and the degree of crude oil is becoming heavier. It has become a fact before people. The existence of these impurities not only poisons the catalyst in the subsequent treatment process, but also emits A large amount of harmful gases such as sulfur oxides and nitrogen oxides are released, endangering human health and environmental protection. The use of catalysts with high activity and good stability can not only ease the process conditions, but also reduce hydrogen consumption and achieve energy saving and consumption reduction. [0003] The hydrotreating process is to loa...

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Problems solved by technology

In the preparation process of the above catalyst, organic additives are added to the impregnating liquid to increase the viscosity of the impregnating liquid, which is not conducive to the dispersion of active metals on the surface of the carrier, and the catalyst particles after impregnation are easy to stick together, and there is a group phenomenon. There is metal precipitation on the surface of the catalyst, which affects the high dispersion of active components on the surface of the carrier and adversely affects the activity of the catalyst

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