Preparation method of hydrofining catalyst

Abstract

The invention discloses a preparation method of a hydrofining catalyst. The method comprises the following steps of in the presence of an organic compound, preparing nickel and aluminum precipitates by a normal precipitation method, preparing tungsten, molybdenum and aluminum precipitates by a parallel flow precipitation method, mixing the nickel and aluminum precipitates with the tungsten, molybdenum and aluminum precipitates, performing ageing, adding urea while performing hydrothermal treatment, then performing shaping and the like so as to prepare the catalyst. The catalyst prepared by the method is high in content of surface phase active metal, and high in active site density, the active metal is uniformly dispersed, the active metal is well coordinated and matched, the utilization rate of the active metal is high, and the pore structure of the catalyst is reasonable. The catalyst is high in mechanical strength, has higher hydrodesulfurization and hydrodenitrogenation reaction properties, and is particularly suitable for being used in ultra-deep hydrodesulfurization and denitrification reactions of diesel fractions.

Description

technical field [0001] The invention relates to a preparation method of a hydrogenation refining catalyst, in particular to a preparation method of a high-activity bulk phase hydrogenation treatment catalyst. Background technique [0002] At present, in the world, crude oil is becoming increasingly heavy and inferior, coupled with the continuous development of the world economy and increasingly stringent environmental protection regulations, it is necessary to produce a large amount of light clean fuel. The development and use of ultra-low sulfur or even sulfur-free gasoline and diesel is the trend of clean fuel development in the world today. The use of traditional hydrodesulfurization catalysts can also achieve deep desulfurization or even ultra-deep desulfurization of diesel oil 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 the reaction tempera...

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