Preparation method of aluminium oxide-based carrier containing silicon and boron

Abstract

The invention discloses a preparation method of an aluminium oxide-based carrier containing silicon and boron. The preparation method comprises following steps: water soluble silicone oil and a soluble boron-containing compound are introduced into an aluminium oxide-based carrier successively or simultaneously, and the aluminium oxide-based carrier containing silicon and boron is obtained via heat treatment. The preparation method is capable of adjusting distribution of acid centers and hydrogenation active centers, achieving coordination effects, and improving catalyst performance; and the modified aluminium oxide-based carrier is suitable to be taken as a hydrogenation catalyst carrier.

Description

technical field [0001] The invention relates to a preparation method of an alumina-based carrier containing silicon and boron, which is especially suitable for a carrier of a hydrogenation denitrogenation catalyst. Background technique [0002] Most supported catalysts are prepared by impregnation method, such as various hydrogenation catalysts. Alumina is often used as a carrier material for this type of catalyst. but pure Al 2 o 3 The interaction force between the active metal on the surface and the carrier is relatively large, and it is easy to form inactive species (such as the formation of nickel-aluminum spinel), and it is difficult to completely vulcanize to form a type II active phase with high hydrogenation activity. At the same time, the acidity of the catalyst surface has a great influence on the activity of the hydrogenation catalyst. The removal of heteroatoms in the raw material requires the catalyst to have hydrogenolysis activity, which occurs on the acidi...

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Problems solved by technology

[0006] The above-mentioned prior art uses co-precipitation method or adding additives during molding. The former will cause active metals and Si and other additives to enter the bulk phase during the co-precipitation process, and multiple substances are precipitated at the same time. The same precipitation conditions cannot be simultaneously The best precipitation conditions for a variety of substances, and the additives have no selectivity to the formation of the active metal active phase and the adjustment of the acidity of the catalyst, thus affecting the overall performance of the final catalyst; while the latter adds Si and other additives during kneading molding, It is not conducive to the uniform dispersion of additives, not only the utilization rate of additives is reduced, but also the comprehensive adjustment effect on the acidity and activity of the catalyst is weak, which is not conducive to the improvement of the comprehensive performance of the catalyst