Hydroprocessing catalyst and preparing method thereof

Abstract

The present invention discloses a hydrogenation treatment catalyst and its preparation method. It is applicable to hydrogenation treatment of heavy oil, specially hydrogenation treatment of heavy fraction. Said catalyst is prepared by loading molybdenum, nickel and phosphorus on silicon-contained aluminium oxide carrier prepared by adopting a special method, and said silicon-contained aluminium oxide carrier is prepared by adding nano silicon-containing compound, for example nano silicon dioxide. As compared with existent catalyst it has higher activity for hydrodesulfurization and hydro-denitrification.

Description

1. Technical field [0001] The invention relates to a petroleum hydrocarbon hydrogenation treatment catalyst and a preparation method thereof, in particular to a heavy hydrocarbon hydrogenation treatment catalyst and a preparation method thereof. 2. Background technology [0002] In recent years, in order to meet the requirements of protecting the environment, many heavy distillate oil hydrotreating catalysts with high desulfurization, denitrogenation and polycyclic aromatic hydrocarbon hydrogenation activities have been reported. Catalysts containing alumina or alumina-silica is one of them. US4,568,449 and US4,446,248 patents introduce a supported hydrogenation catalyst with nickel, molybdenum, and phosphorus as active components. It is transformed into γ-alumina, and nickel, molybdenum and phosphorus are loaded by the impregnation method, and then dried and calcined at 450-600 ° C to obtain a catalyst in the metal oxidation state. Compared with the conventional nickel-mo...

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Problems solved by technology

The loading method of silicon is to add sodium silicate (water glass) in the process of preparing pseudo-boehmite, and then remove sodium ions by washing, and the loading of phosphorus is by adding phosphoric acid or phosphoric acid to the silicon-containing aluminum hydroxide gel. ammonium salt and / or loaded nickel, molybdenum and phosphorus by the impregnation method, because the silicon source (water glass) system colloidal substance introduced into the system is in an inhomogeneous state when in contact with alumina, making silicon oxide on the surface of alumina The uneven distribution of silica limits the utilization rate of silica, thereby weakening the effect of improving the surface properties of the catalyst, such as affecting the distribution range of the acid strength on the catalyst surface, increasing the proportion of strong acid above 400 ° C, especially reducing the 150 ~ 250 ° C The proportion of weak acid and medium-strong acid at 250-400°C to the total acid not only affects the metal distribution and dispersion degree on the surface of the catalyst; but also the strong acid center of the catalyst with too much acidity is stronger, the initial activity is higher, and the carbon deposition speed is fast , quick deactivation, short life, therefore, not suitable for hydrotreating reaction of heavy distillate oil