Hydrogenation catalyst composition and preparation method thereof

Abstract

The invention discloses a hydrogenation catalyst composition and its preparation method. The hydrogenation catalyst composition comprises an alumina carrier, active metal and an auxiliary agent, wherein the active metal is one or more metals selected from VIII group and / or VIB group metallic elements; and the auxiliary agent is one or two elements selected from silicon or zirconium. Concentration of silicon or zirconium in the catalyst is metered according to oxide and gradually decreases from the catalyst granule center to the external surface. Content of silicon and / or zirconium at R of granules is 1.0-3.0 wt%; content of silicon and / or zirconium at 1 / 3 of R is 0.5-1.0 wt%, and content of silicon and / or zirconium at 2 / 3 of R is 0.1-0.5 wt%, wherein R is radius of catalyst granules with the catalyst center as the starting point. The catalyst prepared by an impinging stream co-precipitation gelling mode has the following advantages: particle size distribution is centralized; the catalyst has an ideal pore structure; contents of the auxiliary agent and the active metal in the catalyst are reduced gradiently; inactivation rate of the catalyst can be effectively reduced; and metal-removal and metal-holding capabilities of the catalyst are enhanced.

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 additives and active metal concentrations and a method thereof. Background technique [0002] Crude oil and distillates derived from crude oil contain impurities such as sulfur, nitrogen, oxygen and metals. The existence 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 products, the presence of impurities such as sulfur, nitrogen, oxygen and metals can poison catalysts. Therefore, removing the above-mentioned impurities is an important process in oil processing. Distillate oil hydrotreating refers to the process of contacting raw oil and hydrogen with a catalyst at a certain temperature and pressure to remove impurities and saturat...

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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 uneven, the particle size of the prepared alumina particles is small, and the crystallinity is not high; Complex, and high-temperature calcination can easily cause the loss of catalyst specific surface area and pore volume, making the pore structure of the catalyst unsatisfactory; moreover, high-temperature calcination of the catalyst can easily cause active metals to gather and form inactive nickel-aluminum spinel, thus affecting 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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