PROTECTIVE LAYER CATALYST, METHOD OF ITS PREPARATION AND USE Russian patent published in 2020 - IPC B01J23/883 B01J23/847 B01J21/02 B01J21/04 B01J37/00 C01G49/04 

FIELD: chemistry.

SUBSTANCE: invention relates to chemistry, particularly to catalysts of protective layer for hydrofining of heavy oil fractions, and can be used in oil refining and petrochemical industry. Developed a catalyst composition of a protective layer for hydrofining of heavy oil fractions, which contains from 1 to 5 wt% of V₂O₅, from 1 to 10 wt% of SiO ₂ and the rest – Al₂O₃ and inorganic impurities obtained from combustion of rice husk flour, wherein the total specific volume of the catalyst pores ranges from 0.9 to 1.5 ml/g, and the effective pore diameter ranges from 70 to 120 Å. Also disclosed is a method of preparing a catalyst which includes peptizing aluminum hydroxide obtained by reprecipitation from aluminum trihydrate or hydrolysis of aluminum alcoholate, concentrated HNO₃, peptizing vanadium oxide V₂O₅ with concentrated HNO₃ in molar ratio V₂O₅ : HNO₃ from 1 to 5, applying peptized V₂O₅ on particles of rice husks flour with size of 30–50 mcm, mixing peptised aluminum hydroxide with rice husks V₂O₅ applied onto particles of rice husks, evaporating the mixture to residual moisture content of 60–65 wt%, molding, subsequent drying of the obtained particles at temperatures from 60 to 120 °C for 6 hours, and calcining at 550–600 °C for 2 hours to form SiO₂. Molding is performed by extrusion in the form of hollow cylinders with inner diameter of 1–5 mm, outer diameter of 10–15 mm, height of 5–10 mm. Disclosed also is a method of using the disclosed catalyst as a protective layer catalyst to reduce deposits of organometallic compounds in hydrotreating heavy oil fractions.

EFFECT: technical result enables to develop a new wide-pore catalyst protective layer to reduce deposits of organometallic compounds in the upper layer of hydrofining catalyst of heavy types of raw material, method of its preparation and use, while increasing demetalizing activity of the catalyst.

4 cl, 3 tbl, 6 ex