Preparation method for hydrogenation catalyst

Abstract

The present invention discloses a preparation method for a hydrogenation catalyst. According to the method, a coprecipitation method is adopted to generate a mixture comprising a NixWyOz composite oxide and a precursor of aluminum oxide; the mixture and MoO3 are subjected to beating, mixing, filtering, shaping, drying and baking to obtain the catalyst, wherein the method for generating the NixWyOz composite oxide and the precursor of the aluminum oxide by the coprecipitation method comprises: preparing an acid mixing solution A containing Ni, W, and an aluminum salt; preparing an aluminum-containing alkaline solution B; and carrying out co-current flow of the solution A and the solution B to carry out gelling to obtain the catalyst. According to the method of the present invention, the aluminum source comprises two parts, one is the acid mixing solution A, and the other is the aluminum-containing alkaline solution B, such that the excessive growth of the grain during the precipitation forming process can be effectively controlled, the reduction of the specific surface area of the catalyst can be inhibited, and the adhesion deteriorating of the catalyst can be inhibited so as to improve the pore structure and the mechanical strength of the catalyst. The method of the present invention is mainly applicable for the preparation of the bulk phase catalysts with the high metal content, wherein the bulk phase catalysts provide high activities for the deep impurity removal process of the hydrocarbon, and can be adopted to process the heavy raw materials.

Description

technical field [0001] The present invention relates to a preparation method of a hydrogenation catalyst, especially a preparation method of a high-metal catalyst, in particular to a preparation method of a catalyst for hydroconversion or hydrotreating of hydrocarbon oil, especially for heavier Preparation method of hydrogenation catalyst for deep desulfurization, denitrogenation and other impurity removal processes of hydrocarbon oil. Background technique [0002] Impurities such as S and N in fuel oil and aromatic hydrocarbons (especially polycyclic aromatic hydrocarbons) will form harmful substances such as SOx, NOx and solid particles during use, which not only endanger human health, but also form acid rain in the air, causing greater pollution with destruction. In the past ten years, many countries including North America, Europe, and Japan have proposed the concept of ultra-low sulfur diesel oil (ULSD) and have continuously formulated new fuel specifications to limit ...

AI Technical Summary

Problems solved by technology

Due to the high metal content of the catalyst prepared by this method, there is often a lack of sufficient interaction between the metal and alumina, resulting in poor catalyst strength

The active component part is composed of a large number of metals, and some internal metal components cannot be fully utilized during the formation of Ni-Mo or Ni-Mo-W powder, resulting in loss of activity, and this problem cannot be solved by simple bonding

[0010] CN1342102A discloses a mixed metal catalyst, which is obtained by co-precipitating three active metals. Its main disadvantage is that no coordination effect between different active metals has been found

None of the above patents deal with this

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