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. Concentrations ofactive metal and additive increase 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, porediameters of the 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 is realized, 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 hydrogenation catalyst and a preparation method thereof. Background technique [0002] The pore diameter of the residue hydrogenation catalyst is generally concentrated in 8-15nm, and the catalyst has a high initial activity. The content of colloidal asphaltenes in the residual oil raw materials is relatively high and the molecular diameter ranges from 10nm to several hundred nm. The metal impurities in the colloidal asphaltenes are mostly unevenly distributed in the catalyst particles, and there are more internal deposits along the catalyst particle size. The tendency of less external deposition is mainly due to the irregular arrangement of pores of different sizes in the catalyst, and metal impurities deposit on the outer surface to block the pores, resulting in the effective use of large internal pores and the ineffective use of active phase metals, greatly reduci...

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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