Hydrogenation catalyst composition and preparation method thereof

Abstract

The invention discloses a hydrogenation catalyst composition and a preparation method thereof. The hydrogenation catalyst composition comprises an aluminum oxide carrier, an active metal and an auxiliary agent, wherein the active metal is selected from one or more of VIII family and / or VIB family metallic elements, and the auxiliary agent is selected from one or two of silicon or zirconium; the concentration of silicon and / or zirconium in the catalyst, in the form of oxides, are gradually increased from centers to outer surfaces of catalyst particles, wherein the concentration of silicon and / or zirconium at a position of 1 / 3R of particles is 0.1-0.5wt%, the concentration of silicon and / or zirconium at a position of 2 / 3R is 0.5-1.0wt%, the concentration of silicon and / or zirconium at a position of R is 1.0-3.0wt%, and R is the semi-diameter of the catalyst particles by taking the center of the catalyst as an initial point. The catalyst prepared by adopting an impinging stream co-precipitation gel forming mode in the invention is centralized in particle size distribution, and has an ideal pore structure, and the auxiliary agent and the active metal are distributed in the catalyst in a gradient increase mode, so that the deactivation rate of the catalyst can be effectively reduced, and the desulfurization and denitrification capacities of the catalyst are improved.

Description

technical field [0001] The invention relates to a hydrogenation catalyst composition and a preparation method thereof, in particular to a hydrogenation catalyst composition with a gradient distribution of the concentration of auxiliary agents and active metals and a preparation method thereof. Background technique [0002] Crude oil and distillates derived from crude oil contain impurities such as sulfur, nitrogen, oxygen and metals. The presence of these impurities not only affects the stability of the oil, but also emits SO during use X , NO X and other harmful gases pollute the environment. During the secondary processing of oil, the presence of impurities such as sulfur, nitrogen, oxygen and metals can poison the catalyst. Therefore, the removal of the above impurities is an important process in oil processing. Distillate hydrotreating refers to the process of contacting raw oil and hydrogen with catalyst under certain temperature and pressure to remove impurities an...

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Problems solved by technology

There are many deficiencies in the preparation process of the catalyst. Firstly, the reaction environment in the process of neutralization and gelation is not uniform, the particle size of the prepared alumina particles is small, and the crystallinity is not high; secondly, the catalyst preparation process adopts multiple roasting processes, which makes the operation process complicated. , and high-temperature calcination can easily cause the loss of specific surface area and pore volume of the catalyst, making the pore structure of the catalyst unsatisfactory; moreover, calcination of the catalyst at high temperature can easily cause the aggregation of active metals and form inactive nickel-aluminum spinel, thus affecting the performance of the catalyst. activity and many other issues

[0005] CN101927197A relates to a hydrogenation catalyst and a preparation method in which the concentration of active metals and acidic additives is distributed in a gradient-decreasing manner. By preparing a relatively concentrated active metal solution and acidic additive solution, deionized water or ammonia water is gradually added during the impregnation of the carrier The method of diluting the solution is saturated and sprayed on the carrier; or by preparing at least two active metal solutions and acidic additive solutions with different concentrations, and spraying them on the carrier according to the concentration of the active metal solution and the acidic additive solution from high to low; or using Impregnation with a solution with a higher concentration of acidic additives, gradually adding a solution with a lower concentration of acidic additives during the impregnation process and diluting with deionized water; drying and roasting; impregnation with a solution with a higher concentration of active metals, gradually adding active metals during the impregnation process Impregnation in a solution with a lower metal concentration and dilution with deionized water; or the acidic additive impregnation step is carried out after metal impregnation; drying and roasting; It is easy to cause the blockage of the catalyst pore structure and the destruction of the pores, and the preparation process is complicated, time-consuming and labor-intensive

At present, there are few reports on the preparation method of alumina with gradient distribution of additive concentration

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