FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing a hydrodemetallization catalyst comprising: an aluminum oxide support, an active hydrogenating-dehydrogenating phase containing at least one group VIB metal of the periodic table of elements, optionally at least one group VIII metal of the periodic table, optionally phosphorus, wherein said catalyst has: specific surface area SBET more or equal to 100 m2/g, total pore volume greater than or equal to 0.75 ml/g, average volume diameter of mesopores from 18 to 26 nm, volume of mesopores greater than or equal to 0.65 ml/g, macropore volume from 15 to 40 % of total volume of pores; and wherein said method includes at least the following steps: a) dissolving acidic aluminum precursor, b) adjusting the pH with an alkaline precursor, c) coprecipitation of the acid precursor and the alkaline precursor, wherein at least one of the two contains aluminum to obtain an alumina gel suspension with the desired concentration of aluminum oxide, d) filtration, e) drying to obtain powder, f) forming, g) thermal treatment to obtain alumina substrate, h) introducing, by impregnation, an active hydrogenating-dehydrogenating phase onto said alumina support.
EFFECT: technical result is a catalyst obtained using said method has a particularly advantageous porous structure with content of an active phase suitable for heavy hydrogenation of hydrodemetallization reactions.
7 cl, 6 dwg, 12 tbl, 12 ex
