Preparation method of hydrogenation catalyst

Abstract

The invention discloses a preparation method of a hydrogenation catalyst. The preparation method of the hydrogenation catalyst comprises the following steps: (1) impregnating a molecular sieve with animpregnation solution I containing a VIII group metal compound, drying, and roasting to obtain a modified molecular sieve; (2) uniformly mixing the modified molecular sieve, pseudo-boehmite precursorslurry and organic alcohol to obtain a slurry A; (3) adding a silane coupling agent into the slurry A, uniformly mixing, and then adjusting the pH value of the slurry to 7.5-11 to obtain a slurry B;(4) aging the slurry B obtained in the step (3), filtering to remove water from the material after aging is finished, adding organic amine and a silane coupling agent, kneading into a plastic body, molding, drying, and roasting to obtain a composite carrier; and (5) loading a VIII group metal and a VIB group metal onto the composite carrier to prepare the hydrogenation catalyst. The catalyst has high hydrogenation performance, and is easy for post-hydrogenation desulfurization of sulfides which are difficult to directly remove and hydrogenation saturation of polycyclic aromatic hydrocarbons.

Description

technical field [0001] The invention relates to a method for preparing a hydrogenation catalyst. Background technique [0002] In today's petroleum refining process, catalysts play a very important role, and the physical and chemical properties of catalyst supports have a great influence on the activity of catalysts. Usually the carrier of the hydrogenation catalyst is porous acidic alumina, and there are also literature patent reports to adopt porous low-acidity molecular sieve or composite alumina (CN103349995A, CN102631934A, CN105251527A, J.Catal.317(2014) 303-317, J.Catal.317( 2010) 273-286) as a carrier to prepare a highly active hydrogenation catalyst. Compared with porous acidic alumina carrier catalyst, this catalyst has stronger hydrogen adsorption capacity, so its hydrogenation activity is higher and it is easy to 4,6-dimethyl Hydrodesulfurization of dibenzothiophene (4, 6-DMDBT) which is difficult to directly remove sulfide. However, this type of molecular sieve...

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Problems solved by technology

This method also does not avoid the addition of acid during the molding process, which will still lead to partial destruction of the carrier pore structure

At the same time, this method uses organic substances containing hydroxyl or carboxyl groups to enhance the binding ability of alumina and molecular sieves. There is no chemical reaction between alumina and molecular sieves, so it is difficult to effectively combine them. During the drying and roasting process, with the decomposition of organic substances, the product catalyst The alumina and molecular sieve components will agglomerate

[0004] At the same time, for the composite molecular sieve-alumina carrier, due to the difference in the adsorption properties of different material components, the catalyst synthesized by the conventional impregnation method cannot reflect the excellent performance of the composite carrier.

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