Method for preparing nickel-based catalyst precursor

Abstract

The invention discloses a method for preparing a nickel-based catalyst precursor. The method comprises the following steps of: preparing slurry from aluminum oxide and / or silicon oxide serving as a carrier, an active metal ingredient and an aid ingredient; and adding the slurry and a precipitating agent into a reaction kettle in a cocurrent flow mode. By the method, the active ingredient is uniformly precipitated and highly and uniformly dispersed on the carrier; meanwhile, precipitation is performed in the cocurrent flow mode, and a precipitation environment in the precipitation process is uniform, so that precipitates have the same shape and grain size. A catalyst prepared from the nickel-based catalyst precursor prepared by the method can be used in the process of hydrodecolorizing C5 petroleum resin, C9 petroleum resin and C5 and C9 blended petroleum resin.

Description

technical field [0001] The present invention relates to a kind of preparation method of nickel-based catalyst precursor, the nickel-based catalyst prepared by former precursor is used for C 5 Petroleum resin, C 9 Petroleum resin and C 5 、C 9 In the process of hydrodecolorization of blended petroleum resins. Background technique [0002] Nickel-based hydrogenation catalyst is cheap, highly active, and has a strong ability to saturate olefins and aromatics. At the same time, it can effectively hydrogenate organic compounds containing S, N, O and other heteroelements in oil, and has a wide range of raw materials. , high liquid yield, good product quality and other advantages. The general preparation methods of nickel-based hydrogenation catalysts include: co-precipitation method, mechanical mixing method, impregnation method, etc. Co-precipitation is a method of simultaneously precipitating two or more components. Its characteristic is that several components can be obtai...

AI Technical Summary

Problems solved by technology

The disadvantages of the preparation of the catalyst are: firstly, during the precipitation process, the acidic nickel salt solution is added to the alkaline precipitant solution, so that the precipitation environment in the reaction kettle is different at the moment of the precipitation process, that is, the precipitation reaction is in the reaction kettle. The pH value of the pH value changes from large to small, resulting in different sizes of precipitated grains, affecting the activity level of nickel and reducing the activity of the catalyst; It belongs to the mixing of two solid substances, which is not conducive to the dispersion of nickel precipitates on the surface of the carrier and reduces the utilization rate of active metals

The disadvantage of this method is that the precipitation temperature is high, and the ammonia released during the precipitation process also causes environmental pollution.

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