Multi-metal body catalyst for ultra-deep desulphurization and denitrogenation as well as hydrofining and preparation method thereof

Abstract

The invention relates to a multi-metal body catalyst for ultra-deep desulphurization and denitrogenation as well as hydrofining and a preparation method thereof. The multi-metal body catalyst is a mixed metal oxide which comprises VIII group metal, IVB group metal and two VIB metals; wherein the catalyst is calculated according to oxides and the catalyst is used as a reference, and the catalyst comprises 1-60 wt.% of VIII group metal, 1-50 wt.% of IVB group metal, and 5-60 wt.% of VIB metal. The invention also discloses a preparation method and an application of the catalyst. The catalyst is applied to a hydrofining reaction of fuel oil containing sulfur and nitrogen; the reaction condition is as follows: the temperature is 280-400 DEG C, the hydrogen pressure is 1-20 MPa, the volume ratio between hydrogen and the fuel oil containing sulfur and nitrogen is 50-1000, and the volume space velocity of the material is 0.1-10h<-1>; the catalyst can be used for respectively eliminating sulfur and nitrogen in diesel oil fractions from 500ppm to 10ppm in the reaction, and ultra-deep hydrodesulfurization and ultra-deep hydrodenitrogenation of diesel oil is realized.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a hydrorefining multi-metal body catalyst for ultra-deep desulfurization and denitrification, a preparation method thereof and an application in ultra-deep hydrodesulfurization and hydrodenitrogenation reactions of diesel oil. Background technique [0002] At present, due to the decline of the world's oil reserves, the problem of heavy and inferior oil is becoming more and more serious, and the environmental legislation of various countries in the world has increasingly stringent restrictions on the sulfur content of fuel oil and the emission of nitrogen oxides from vehicle exhaust. Therefore, the development of The ultra-deep hydrodesulfurization and denitrification catalyst with higher performance has received more and more attention in the petrochemical industry. The nitrogen-containing compounds and sulfur-containing compounds in fuel oil are the main culprit...

AI Technical Summary

Problems solved by technology

This synthetic method has the following disadvantages: the strong ammonia water used in the synthetic process can pollute the environment; Ni 2+ The complex formed with ammonia is stable and difficult to decompose, resulting in residual Ni ammonium complex ions in the final mother liquor, resulting in pollution and waste; the prepared catalyst specific surface area and pore volume are less (respectively less than 120m 2 / g and 0.2ml / g), which is not conducive to the diffusion of reactants in the catalyst; when used in diesel hydrodesulfurization reaction, it can only show excellent hydrodesulfurization activity under a high pressure higher than 6MPa, so that the catalyst has no effect on the reaction device. Higher requirements are not conducive to industrial applications

[0009] (1) The specific surface area and pore volume of the catalyst are small, and the activity needs to be improved;

[0010] (2) The raw materials used for synthesis are unfriendly to the environment;

[0011] (3) The preparation cost of catalyst is higher;

[0012] (4) Only attention is paid to the hydrodesulfurization activity of the catalyst, and little attention is paid to the hydrodenitrogenation activity of the catalyst

Previously, our group reported the synthesis method of NiMoW bulk catalysts in Chinese patents CN101733120A and CN103657672A. Using environmentally friendly raw materials, the specific surface area (~140m 2 / g) and larger pore volume (~0.4ml / g), can achieve ultra-deep hydrodesulfurization of diesel under relatively mild conditions, but the hydrodenitrogenation activity of the catalyst has not yet been paid attention to

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