Hydrodemetallization catalyst and its preparation method and application

Abstract

The invention relates to the field of catalyst preparation, and discloses a method for preparing a hydrodemetallization catalyst. The method comprises: (1) first contacting a first silicon-containing solution with a first physical pore-enlarging agent; The solution is contacted with the second physical pore-enlarging agent for the second time; (2) the contacted first physical pore-enlarging agent, the second physical pore-enlarging agent and pseudo-boehmite are mixed, shaped, dried, and roasted to obtain a silicon-containing Alumina carrier; (3) carrying out the third contact with the pre-soaking solution and the silicon-containing alumina carrier, the pre-soaking solution containing urea and citric acid; (4) mixing the impregnation solution of the hydrogenation active component with the silicon-containing alumina carrier The fourth contact is carried out, and the contacted silicon-containing alumina carrier is dried and calcined to obtain a hydrodemetallization catalyst. The catalyst prepared by the method has high mechanical strength, suitable pore structure, moderate interaction between active components and supports, and high hydrodemetallization activity and activity stability.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a method for preparing a hydrodemetallization catalyst. Background technique [0002] With the increasing requirements for deep processing of raw materials worldwide, the main energy structure is gradually developing in the direction of macromolecules and high carbon, especially for my country where crude oil is generally heavy. In order to effectively solve the problems of excessive diffusion resistance of heavy oil components in the catalyst pores, heavy metal impurity deposition and coking caused by catalyst activity decline or deactivation, it is urgently required that the alumina carrier widely used in the petrochemical industry has a large pore volume and The characteristic of large aperture. The large pore size is conducive to the diffusion of macromolecular compounds into the catalyst particles, and the large pore volume is conducive to improving the ability to accomm...

AI Technical Summary

Problems solved by technology

[0006] In summary, in the process of preparing macroporous alumina supports and / or hydrodemetallization catalysts in the prior art, physical pore-enlarging agents are usually used to increase the pore diameter of the supports, and the addition of physical pore-enlarging agents can indeed make the alumina The content increases, but it will have adverse effects on the mechanical strength of the carrier and catalyst

In addition, in the process of preparing catalysts at this stage, the interaction between active components and supports needs to be further improved.

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