METHOD FOR PRODUCING MESOPOROUS HYDROXYAPATITE POWDERS BY CHEMICAL CO-PRECIPITATION Russian patent published in 2023 - IPC B01J37/04 C01B25/32 B82Y40/00 

FIELD: catalysis.

SUBSTANCE: invention is related to method for producing mesoporous hydroxyapatite powders used in catalysis. A method for producing mesoporous powders of hydroxyapatite by chemical co-precipitation is described, including preparation of solutions of calcium nitrate and ammonium phosphate, mixing a solution of calcium nitrate, alkalization of the pH of an ammonium nitrate solution with an aqueous solution of ammonium, drop-by-drop introduction of an ammonium phosphate solution into a stirring solution of calcium nitrate, aging of the resulting precipitate in the mother liquor, filtration and subsequent drying of the precipitate, while the initial precursors are dissolved in a mixture of liquids from distilled water and ethyl alcohol in a 1:1 volume ratio or distilled water and acetone in a 1:1 volume ratio with concentrations from 1 to 5 M, the calcium nitrate solution is stirred using a stirring device at a speed of 300-600 rpm, bring the pH of the solution to values of 9-11, during introduction of ammonium phosphate, constant pH level is maintained in the range of 9-11, the resulting precipitate is subjected to aging in the mother liquor at a constant temperature of 37°C for 21 days, then filtered and dried at 60°C, as a result, powders are obtained, consisting of a single phase hydroxyapatite, with a nitrogen adsorption-desorption isotherm corresponding to the mesoporous structure of the powders, with a specific surface area from 80 to 110 m²/g, a total pore volume from 0.30 to 0.60 cm³/g, average pore size in the range from 10 to 25 nm.

EFFECT: obtaining single-phase powder with specific surface area from 80 to 110 m²/g, total pore volume from 0.30 to 0.60 cm³/g, average pore size in the range from 10 to 25 nm.

1 cl, 2 dwg, 1 tbl, 7 ex