Hydro-denitrification catalyst and application thereof

Abstract

The invention relates to a hydro-denitrification catalyst and application thereof. The hydro-denitrification catalyst is prepared from a modified alumina support and a hydro-denitrification active metal component loaded in the modified alumina support; the modified alumina support is granular and is prepared by forming and modifying a hydrated alumina composition; the hydrated alumina compositioncontains hydrated alumina and a compound with at least two proton acceptor sites, and the value of the composition is less than 5. The hydro-denitrification catalyst has good hydro-denitrification effect.

Description

technical field [0001] The invention relates to a hydrodenitrogenation catalyst and its application. Background technique [0002] The fixed-bed residual oil hydrogenation catalyst adopts a graded system, mainly including protective agent, demetallization agent, desulfurization agent, denitrification agent, carbon residue removal agent, etc. With the continuous construction of residual oil hydrogenation units such as Sinopec Yanjiang Refinery and PetroChina North China Branch, the processing raw materials will be mainly based on low-sulfur and high-nitrogen residual oil such as Shengli Pipeline Crude Oil or North China Crude Oil. Compared with the high-sulfur residual oil in the Middle East, the characteristics of this type of residual oil raw material are: low sulfur content (0.2%-2.5%), high nitrogen content (0.3%-0.7%), high colloid content, low asphaltene content, High nickel content, low vanadium content. Compared with the high-sulfur and low-nitrogen residual oil in ...

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Problems solved by technology

According to claim 4 in its claims, it can be seen that the method of reducing the water content of pseudo-boehmite in the preparation process or increasing the dry basis of pseudo-boehmite is through conventional drying methods, which is generally thought of but difficult to implement The method is mainly due to four aspects: First, the pseudo-boehmite that has not been completely dried has strong viscosity and is difficult to transfer, which will cause secondary dust pollution

The second is because the drying starts from the surface. Because the product is not completely dried, there is a sandwich biscuit phenomenon, that is, the surface of part of the pseudo-boehmite is dry (basically does not contain free water) and the inside is wet (free water is basically maintained before drying. state), hard particles will be formed on the dry surface. Based on the description of the patent, there is no special method to eliminate this phenomenon. The incompletely dried pseudo-boehmite is added with peptizer, binder, etc. When forming after kneading, hard particles formed during the drying process will cause blockage in the extrusion process and affect production efficiency

Third, due to the limitations of the conventional pseudo-boehmite preparation process and drying conditions, it is difficult to control and stabilize the dry base of pseudo-boehmite, and the instability of the dry base will cause great interference to the molding process, making the molding process very unstable , resulting in an increase in substandard products and low production efficiency

Fourth, because the dry basis of pseudo-boehmite is low (30%-50%), it is far lower than the conventional dry basis content of about 70%, that is, the water content is high, and the forming formula is a conventional formula. High, basically no extrusion pressure is generated during the molding process, so the carrier obtained after the extruded strips are dried and roasted basically has no mechanical strength, and will be pulverized if any external force is applied, which does not have the possibility of industrial application at all. sex, which is the biggest problem with the technology

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