Hydroprocessing catalyst for heavy oil and preparing method thereof

Abstract

The invention relates to a preparation method of a hydrogenation catalyst. The catalyst is prepared by loading molybdenum, nickel and phosphorus on a phosphorus-containing and silicon-alumina carrier prepared by a special method. The carrier prepared by the special method is obtained by aging It is prepared by adding phosphorus additives during the process and adding nano-silicon-containing compounds such as silicon dioxide during the carrier molding process. Compared with the existing catalysts, the catalyst of the present invention has a large pore volume, a high specific surface area and a more concentrated pore size distribution under the premise of ensuring that it contains a relatively high hydrogenation active metal component, and is suitable for the hydrotreating of heavy oil, especially Shows higher activity in hydrodesulfurization and denitrogenation of heavy distillates.

Description

1. Technical field [0001] The invention belongs to a heavy oil hydrogenation treatment catalyst and a preparation method thereof, which is suitable for the hydrogenation treatment of heavy oil, especially the hydrogenation treatment of heavy distillate oil. 2. Technical background [0002] Generally speaking, most of the hydrotreating catalysts for hydrocarbon feeds are supported by alumina, with a certain combination of elements such as tungsten, molybdenum, nickel and cobalt as active components. In order to further improve the activity and activity stability of hydrotreating catalysts, various methods have been adopted, such as improving the preparation conditions, modifying the carrier, adding additives and so on. Among them, the selected additives include silicon, phosphorus, fluorine, boron, zirconium, titanium, etc., and the methods of adding additives include co-precipitation, mechanical mixing and impregnation. Chinese invention patent CN1075548C introduces a metho...

AI Technical Summary

Problems solved by technology

The silicon additive in the catalyst is added during the preparation of pseudo-boehmite, and the silicon source (water glass) is a colloidal substance. This substance and its addition method have a process that affects the properties and / or microstructure of alumina The impact of the influence of the carrier is likely to cause the inhomogeneity of the carrier properties; at the same time, the pore distribution is more dispersed due to the expansion of the carrier by adding silicon and phosphorus twice, which affects the surface properties and performance of the carrier, which is not conducive to improving the catalyst activity and other corresponding problems. Performance