A kind of preparation method of bulk phase hydrogenation treatment catalyst

Abstract

The present invention discloses a bulk phase hydrotreating catalyst preparation method, wherein the catalyst comprises hydrogenation activity components such as W, Ni and Mo, and alumina. The preparation method comprises: preparing a nickel-aluminum precipitate slurry I by using an acid type precipitation method; preparing a tungsten-aluminum precipitate slurry II by using a parallel flow precipitation method; mixing the two slurries; aging; carrying out a hydrothermal treatment with water vapor, and adding urea; beating with MoO3, uniformly mixing, and soaking in a solution containing an organic compound; and molding and carrying out other steps to prepare the hydrotreating catalyst. The bulk phase hydrotreating catalyst of the present invention is especially suitable for the super-deep hydrodesulfurization and denitrification reaction of the diesel oil distillate.

Description

Technical field [0001] The invention relates to a preparation method of a hydroprocessing catalyst, in particular to a preparation method of a high-activity bulk hydroprocessing catalyst. Background technique [0002] At present, crude oil is becoming increasingly heavier and degraded worldwide, coupled with the continuous development of the world economy and increasingly stringent environmental regulations, it is necessary to produce a large amount of light and clean fuels. The development and use of ultra-low sulfur or even sulfur-free gasoline and diesel is the trend of clean fuel development worldwide. The use of traditional hydrodesulfurization catalysts can also achieve deep desulfurization or even ultra-deep desulfurization of diesel by increasing the severity of the reaction, such as increasing the reaction temperature, hydrogen partial pressure, or reducing the reaction space velocity, but the increase in reaction temperature will cause the product color Deterioration a...

AI Technical Summary

Problems solved by technology

[0010] The bulk phase hydrogenation catalyst disclosed by CN102049265A adds ammonium bicarbonate during the coprecipitation process, and the bulk phase hydrogenation catalyst disclosed by CN102451703A adds carbon dioxide during the coprecipitation process to generate carbonate or bicarbonate. It releases a certain amount of gas during the roasting process. Under the impact of the gas, the pore volume and specific surface area of ​​the catalyst are increased, so that more metal active sites are exposed on the surface of the catalyst, but this method will cause some pores to collapse. , the pore distribution is dispersed, the mechanical strength is reduced, and the active metal is locally aggregated, and the exposed metal active sites are limited

The co-precipitation method adopted above will make the distribution of different hydrogenation active metals difficult to control, thereby affecting the distribution of different hydrogenation active metals and reducing the interaction between active metals. At the same time, the content of surface active metals in the catalyst is relatively low. Small and low active center density, which ultimately affects the ultra-deep hydrodesulfurization performance of the catalyst