Hydrodenitrification catalyst carrier as well as preparation method and application thereof

Abstract

The invention discloses a hydrodenitrification catalyst carrier as well as a preparation method and application thereof, the catalyst carrier is prepared by adopting a solvent evaporation self-assembly method, and the solvent evaporation self-assembly method comprises the following steps: sequentially dropwise adding aluminum isopropoxide and an isobutyl titanate solution into an ethanol solution containing a template agent, and then drying and roasting. The catalyst carrier prepared by the preparation method disclosed by the invention is suitable for a hydrotreating process of petroleum distillates, and is particularly suitable for a deep hydrodenitrogenation process of heavy distillates, and the interaction force between the carrier and active metals is modulated by adopting a solvent evaporation self-assembly method with simple preparation steps, so that the hydrodenitrogenation of the heavy distillates is realized. The defects of strong interaction force between traditional aluminum oxide and active metal and low metal active center utilization rate are overcome, and the hydrogenation catalytic activity of the catalyst is remarkably improved.

Description

technical field [0001] The invention relates to a catalyst carrier and its preparation method and application, in particular to a heavy distillate oil ultra-deep hydrodenitrogenation catalyst carrier and its preparation method and application. Background technique [0002] With the increasing trend of heavy and inferior crude oil worldwide, the proportion of inferior heavy oil in refinery processing raw materials has increased year by year, and the output of heavy distillate oil (such as coker gas oil, vacuum gas oil and deasphalted oil, etc.) also increased. The main use of heavy distillates is as a raw material for subsequent secondary processing. However, since nitrogen compounds are very easy to poison cracking catalysts, it must be hydrotreated to improve its utilization. Nitride usually has the characteristics of strong aromaticity and stable C-N bond, which requires that the hydrotreating catalyst must have both strong hydrogenation performance and cleaning performan...

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Problems solved by technology

[0004] CN1448468 discloses a method for preparing silicon-aluminum composite oxide by sol-gel method. Although the silicon-aluminum composite oxide prepared by the method has a large specific surface area and pore volume, the pore diameter of the silicon-aluminum composite oxide is The distribution is not concentrated, and the proportion of mesoporous channels is relatively small, which limits the diffusion and mass transfer of heavy oil macromolecules; The acidity of the protons on the surface of the composite oxide support is weak, which cannot meet the acidity requirements of the catalyst for the support material

[0005] CN102451670A discloses a method for preparing titanium-aluminum composite oxides. The co-current precipitation method is adopted. Titanium sulfate and sodium metaaluminate are used as precursors, and titanium dioxide is introduced to keep the pH value of the solution. The prepared titanium-aluminum composite oxides have It has the advantages of high specific surface area, large pore volume, good thermal stability, etc., and can be used as a carrier component of catalytic cracking, hydrocracking, and hydrotreating catalysts, showing excellent performance; but the preparation method steps are cumbersome, and the preparation The requirements for the preparation conditions (PH value, temperature) are very strict during the process, which limits the industrial application

[0008] In summary, the current preparation of titanium-aluminum composite oxides includes: sol-gel method, co-precipitation method, pH multiple swing method, etc. The prepared composite oxide has the advantages of high specific surface area and large pore volume. , but the preparation steps are complicated and the conditions are harsh; on the other hand, the pore size distribution of titanium-aluminum composite oxide materials is not concentrated and irregular, which is not conducive to the diffusion of heavy distillate macromolecular compounds. It is urgent to find a new titanium alloy in this field. Preparation method of aluminum composite oxide, providing support material for heavy distillate oil ultra-deep denitrification catalyst to meet practical needs

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