A sulfurized hydrorefining catalyst and its preparation method

Abstract

The present invention discloses a vulcanization type hydrorefining catalyst and a preparation method thereof. The catalyst is a bulk phase hydrorefining catalyst, and comprises the sulfides of hydrogenation active metal components such as W, Ni and Mo, and alumina, wherein the epiphase active metal content is high, the activity site density is large, the active metal dispersion is uniform, the coordinated matching between the active metals is good, the active metal utilization rate is high, the catalyst pore structure is reasonable, the mechanical strength is high, and the vulcanization type hydrorefining catalyst is particularly suitable for ultra-deep hydrodesulfurization and denitrification reactions of diesel oil distillates, and has high hydrodesulfurization and hydrodenitrogenation reaction performances.

Description

technical field [0001] The invention relates to a hydrorefining catalyst and a preparation method thereof, in particular to a highly active vulcanized bulk phase hydrorefining catalyst and a preparation method thereof. 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 reacti...

AI Technical Summary

Problems solved by technology

The conventional catalyst sulfidation method adopts "in-vessel" pre-sulfurization, that is, the catalyst in the oxidized state is first loaded into the reactor, and then hydrogen and sulfide are fed into the reactor during the continuous heating process for pre-sulfurization. This method brings The following problems: (1) special vulcanization equipment should be set up on the hydrogenation unit; (2) the vulcanization agent added in the vulcanization process and the water and hydrogen sulfide generated by the reaction can easily cause corrosion of the high-pressure reactor and related equipment, resulting in Equipment damage and potential safety hazards; (3) The vulcanization process is longer, delaying the start time

(4) The vulcanizing agent used is flammable and toxic, causing pollution to the environment during the vulcanization process; (5) The cost of pre-vulcanization in the device is relatively high

[0012] 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