Volume-phase hydroprocessing catalyst and preparation method thereof

Abstract

The invention discloses a volume-phase hydroprocessing catalyst and a preparation method thereof. The catalyst is spherical particles, and pore diameter distribution has the following characters: an average pore diameter d1 from a center of the catalyst particle to x*R is 50-100 nm, x is 0.1-0.9, an average pore diameter d2 from x*R to the outer surface of the catalyst is 120-180 nm, and d2-d1=40-130 nm, wherein R is a particle semidiameter of the volume-phase hydroprocessing catalyst. The volume-phase hydroprocessing catalyst has the following characters: a specific surface area is 250-350 m<2> / g, a pore volume is 0.8-1.0 mlg-1, and an average pore diameter is 50-150 nm. Reactive metal and additive concentration is gradually increased from the particle center to the outer surface. The volume-phase hydroprocessing catalyst is larger in pore volume and pore diameter, and the pore diameter of the outer surface is greater than the pore diameter of the interior. Surface-phase reactive metal density of the catalyst is larger, a utilization ratio of a hydrogenation reactive metal and a utilization ratio of the interior of the catalyst are higher, a catalyst deactivation rate is reduced,and service life of the catalyst is improved. The method is capable of realizing continuous production of the hydrogenation catalyst, improving production efficiency, and reducing production cost.

Description

technical field [0001] The invention relates to the field of distillate oil hydrogenation, in particular to a bulk phase hydrogenation catalyst and a preparation method thereof. Background technique [0002] The pore size of the residual oil hydrogenation catalyst is generally concentrated at 8-15nm, and the catalyst has a high initial activity. The content of colloidal asphaltenes in residual oil raw materials is relatively high and the molecular diameter ranges from 10nm to hundreds of nm. However, the deposition of metal impurities in colloidal asphaltenes is mostly unevenly distributed in the catalyst particles, and there are many internal deposits along the diameter of the catalyst particles. , the trend of less external deposition is mainly due to the irregular arrangement of pores of different sizes in the catalyst, and the deposition of metal impurities on the outer surface causes the pores to be blocked, resulting in the effective use of large internal pores and act...

AI Technical Summary

Problems solved by technology

The use of co-precipitation method will make the distribution of different hydrogenation active metals difficult to control, thus affecting the distribution of different hydrogenation active metals and reducing the interaction between active metals. At the same time, the content of active metals in the catalyst surface is small and the density of active metals is relatively high Low, ultimately affecting the hydrogenation performance of the catalyst

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