Bulk-phase hydrogenation catalyst and preparation method thereof

Abstract

The invention discloses a bulk-phase hydrogenation catalyst and a preparation method thereof. The bulk-phase hydrogenation catalyst is shaped in spherical particles with pore size distributed as follows: the average pore size d1 from centers of catalyst particles to ranges of x * R is 50- 100nm, where x ranges from 0.1 to 0.9, the average pore diameter d2 from the x * R ranges of the catalyst particles to outer surfaces of the catalyst particles is 120-180nm, wherein d2-d1=40-130nm, and R is the particle radius of the bulk-phase hydrogenation catalyst. The bulk-phase hydrogenation catalyst ischaracterized in that specific surface areas range from 250m<2> / g to 350m<2> / g, pore volumes range from 0.8ml g<1> to 1.0ml g<1>, the average pore diameter ranges from 50nm to 150nm. Concentration ofactive metal increases gradually from the particle centers to the outer surfaces of the catalyst. The bulk-phase hydrogenation catalyst is larger in pore volumes and pore diameters, pore diameters ofthe outer surfaces are larger than interior pore diameters, superficial active metal density of the catalyst is larger, hydrogenation active metal utilization rate and internal catalyst utilization rate are higher, deactivation rate of the catalyst is lowered, and service life of the catalyst is prolonged. By the aid of the preparation method, continuous production of the hydrogenation catalyst isrealized, production efficiency is improved, and production cost is reduced.

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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