Bulk phase hydrogenation catalyst and preparation method thereof

Abstract

The invention discloses a bulk phase hydrogenation catalyst and a preparation method thereof. The catalyst comprises a VIB group metal sulfide, a VIII group metal oxide, Al2O3 and an auxiliary agent. The VIB group metal sulfide is distributed in the bulk phase and the surface phase of the catalyst, and the ratio of the weight content of the VIB group metal sulfide in the surface phase to the weight content of the VIB group metal sulfide in the bulk phase is 3: 1-7.5: 1. The preparation method comprises the following steps: (1) preparing a mixed solution A containing VIB group metal and an aluminum source, and carrying out parallel flow gelatinization with a precipitant to generate slurry I; (2) uniformly mixing the slurry I and an auxiliary agent precursor, and molding to obtain a precursor I; (3) drying and roasting the precursor I, and carrying out vulcanization treatment to obtain a precursor II; and (4) impregnating the precursor II with an impregnation liquid containing a group VIII metal, and drying and roasting the impregnated precursor II in an inert atmosphere to obtain the bulk phase hydrogenation catalyst. The catalyst provided by the invention has high vulcanization degree and high II type active center number, and is especially suitable for a diesel oil hydrofining process.

Description

technical field [0001] The invention relates to the technical field of hydrogenation of oil products, in particular to a bulk hydrogenation catalyst and a preparation method thereof. Background technique [0002] Due to the high hydrodesulfurization and hydrodenitrogenation activity of bulk hydrofining catalysts, more and more attention has been paid in recent years. Bulk hydrofining catalysts are mainly prepared by precipitation method. [0003] CN 106179379 B discloses a method for preparing a hydrotreating catalyst. The preparation method is to separately co-precipitate Ni and Al and W and Al, and then mix the two and perform hydrothermal treatment. The active metal tungsten and nickel in the surface phase of the catalyst have a large active site density, can be well coordinated with the active metal molybdenum, and have a high utilization rate of the hydrogenation active metal. [0004] CN 106179480 B discloses a hydrorefining catalyst composition and a preparation meth...

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Problems solved by technology

However, the preparation process of the above-mentioned bulk catalyst is easy to generate nickel-aluminum spinel that is difficult to sulfide, which leads to a reduction in the degree of sulfidation of the catalyst active metal and a reduction in the number of catalyst active sites. At the same time, W and Mo in the active metal are more difficult to sulfide than Ni, which will lead to In the active metal, Ni is sulfurized first and W and Mo are sulfurized later, resulting in a decrease in the number of highly active W-Ni-S phase and Mo-Ni-S phase, resulting in a decrease in catalyst activity

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