A kind of preparation method of hydrogenation catalyst

Abstract

The invention discloses a method for preparing a hydrogenation catalyst. The preparation method of the hydrogenation catalyst of the present invention comprises: (1) impregnating molecular sieves with impregnation solution I containing Group VIII metal compounds, then drying and roasting to obtain modified molecular sieves; (2) preparing modified molecular sieves, pseudothin water Mix the bauxite precursor slurry and organic alcohol evenly to obtain slurry A; (3) add the silane coupling agent to slurry A and mix evenly, then adjust the pH value of the slurry to 7.5~11 to obtain slurry B; (4) combine the steps (3) The obtained slurry B is aged. After aging, the material is filtered to remove moisture, and organic amine and silane coupling agent are added to knead into a plastic body. After molding, drying and roasting, a composite carrier is obtained; (5) The hydrogenation catalyst is prepared by loading the group VIII metal and the group VIB metal on the composite carrier. The catalyst has very high hydrogenation performance, and is easy to desulfurize after hydrogenation and hydrogenation saturation of polycyclic aromatic hydrocarbons which are difficult to directly remove sulfides.

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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