A kind of preparation method of hydrodemetallization catalyst

Abstract

The invention discloses a preparation method of a hydrodemetallization catalyst. The method includes the following steps that 1, a physical pore-expanding agent I is soaked with an alkali-containing metal element solution I and hydrogenation active component soaking liquid I, a physical pore-expanding agent II is soaked with an alkali-containing metal element solution II and hydrogenation active component soaking liquid II, and the physical pore-expanding agent I and the physical pore-expanding agent II are dried and then soaked with an ammonium salt solution in a spraying mode for use; 2, the physical pore-expanding agent I and the physical pore-expanding agent II obtained in the step 1 are mixed with dry pseudo-boehmite gel powder, a chemical pore-expanding agent, an extrusion aid and a peptizing agent, the mixture is kneaded into plastic, strip extrusion is carried out, a formed material is subjected to heat treatment, the treated material is dried and roasted, and a modified alumina supporter is obtained; 3, the modified alumina supporter is soaked with hydrogenation active component soaking liquid III, and the catalyst is obtained through drying and roasting. The catalyst prepared through the method has a high active metal content at macropores and a low active metal content at micropores, the acid property at macropores is obviously improved, and the anti-carbon capacity of macropores is improved.

Description

technical field [0001] The invention relates to a preparation method of a hydrodemetallization catalyst, in particular to a preparation method of an alkali metal-containing 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...

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Problems solved by technology

[0007] The active metal component of the residual oil hydrodemetallization catalyst prepared by the above method is evenly distributed in the macropores and small pores of the carrier, resulting in a low utilization rate of the macropores. In addition, the surface acidity of the carrier needs to be improved so as to improve the catalytic efficiency. Carbon deposition resistance

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