Hydrodemetallization catalyst and preparation method and application thereof

Abstract

The invention relates to the field of catalyst preparation, and discloses a preparation method of a hydrodemetallization catalyst. The method includes the following steps: (1) first contact is performed on a first silicon-containing solution and a first physical pore-expanding agent, and second contact is performed on a second silicon-containing solution and a second physical pore-expanding agent;(2) the first physical pore-expanding agent and the second physical pore-expanding agent after the contact and pseudo-boehmite are subjected to mixing, molding, drying and calcinating to obtain a silicon-containing alumina carrier; (3) a presoak liquid and the silicon-containing alumina carrier are subjected to third contact, wherein the presoak liquid contains urea and citric acid; and (4) a hydrogenation active component impregnation liquid and the silicon-containing alumina carrier are subjected to fourth contact, and the silicon-containing alumina carrier after the contact is subjected todrying and calcinating to obtain the hydrodemetallization catalyst. The catalyst prepared by the method is high in mechanical strength, is suitable in pore structure, is moderate in effect of activecomponents and carriers, and is high in 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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