Method for preparing hydrofining catalyst

Abstract

The invention discloses a method for preparing a hydrofining catalyst. According to the hydrofining catalyst, firstly, a mixed solution A containing Ni and W and a sodium metaaluminate alkaline solution react in a parallel flow manner, obtained slurry is aged, then, a mixed solution B containing W, Mo and Al components and ammonia water are added to the aged slurry in a parallel flow manner, agingis performed, then, first drying, forming and second drying are performed, treatment is performed with a mixed aqueous solution of aluminum salt and organic acid, washing, third drying, calcination and other steps are performed, and the hydrofining catalyst is prepared. The catalyst can be applied to super deep hydrodesulfurization and hydrodenitrification reactions of diesel fractions, has higher hydrodesulfurization and hydrodenitrification reaction activity and is particularly applied to tretament of diesel materials with high nitrogen and sulfur content.

Description

technical field [0001] The invention relates to a method for preparing a hydrorefining catalyst, in particular to a method for preparing a bulk phase hydrorefining catalyst. Background technique [0002] At present, crude oil is becoming increasingly heavy and inferior, coupled with the continuous development of the world economy and increasingly stringent environmental protection regulations, it is necessary to produce a large amount of light and clean fuels. The development and use of ultra-low sulfur or even sulfur-free gasoline and diesel is the trend of clean fuel development in the world today. The use of traditional hydrodesulfurization catalysts can also achieve deep desulfurization or even ultra-deep desulfurization of diesel oil by increasing the severity of the reaction, such as increasing the reaction temperature, hydrogen partial pressure or reducing the reaction space velocity, but the increase in the reaction temperature will lead to the color of the product. ...

AI Technical Summary

Problems solved by technology

The bulk phase catalyst obtained by this method has a high content of active metals in the surface phase, which is easy to accumulate excessively, thereby affecting the morphology and dispersion of the stacked layer of the active phase

[0011] In the existing co-precipitation method for preparing bulk catalysts, different precipitation methods and gelation conditions will have a great impact on the coordination mode of the catalytic active metal, the distribution of the hydrogenation active metal and the interaction between different hydrogenation active metals. The effect of the sulfided bulk catalyst will also lead to MoS 2 / WS 2 There is a marked difference in the shape of the