Preparation method of hydrogenation catalyst containing molecular sieve and amorphous silica-alumina

Abstract

The invention discloses a preparation method of a hydrogenation catalyst containing a molecular sieve and amorphous silica-alumina. The preparation method comprises the following steps of preparing a catalyst carrier material and introducing a hydrogenation active component by a dipping method or a coprecipitation method to obtain the hydrogenation catalyst. The preparation process of the catalyst carrier material comprises the followings steps of adding a mixture of a molecular sieve and an organic amine into amorphous silica-alumina in gelling, after gelling of the amorphous silica-alumina, carrying out aging, then carrying out hydrothermal treatment and then carrying out filtration, washing and drying to obtain the catalyst carrier material. The preparation method realizes ordered arrangement and uniform deposition of silica-alumina on the surface of the molecular sieve, improves the binding strength of the molecular sieve and the silica-alumina, avoids agglomeration of the amorphous silica-alumina and the molecular sieve and channel blocking caused by the agglomeration, realizes mutual communication of channels of the silica-alumina and the molecular sieve, fully develops synergism of the silica-alumina and the molecular sieve, and improves catalyst use performances. The hydrogenation catalyst can be used for various hydrogenation technologies.

Description

technical field [0001] The invention relates to a method for preparing a hydrogenation catalyst, in particular to a method for preparing a hydrogenation catalyst containing molecular sieves and amorphous silicon-alumina. Background technique [0002] Hydrocracking technology is one of the important means for the secondary processing of crude oil and the lightening of heavy oil, and it has been widely used at present. [0003] The acidic component in the catalyst is generally provided by molecular sieves and / or amorphous silica-alumina (hereinafter referred to as amorphous silica-alumina) and amorphous alumina contained in the catalyst. For molecular sieves, amorphous silica-alumina, and amorphous alumina, the order of acidity decreases in order, while the concentration of pore distribution increases in order, which determines the three in the catalyst. Each exhibits different characteristics and advantages. Amorphous alumina has high specific surface area, good sintering r...

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Problems solved by technology

In this method, amorphous silicon-alumina is prone to agglomeration, and it is also easy to enter the pores of the other party or block the orifice of the molecular sieve, which affects the distribution of amorphous silicon-alumina on the molecular sieve, and the connectivity between molecular sieve and amorphous silicon-alumina channels is poor. The specific surface area and pore volume of the catalyst are reduced, and the distribution of the active metal of the catalyst is uneven, which affects the performance of the catalyst

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