METHOD FOR PRODUCING MESOPOROUS γ-AlO FOR CATALYTIC SYSTEMS Russian patent published in 2020 - IPC B01J37/03 B01J37/32 B01J37/08 B01J21/02 B01J32/00 B01J35/04 B82B3/00 B82Y40/00 

FIELD: technological processes.

SUBSTANCE: invention relates to synthesis of disperse mesoporous materials for catalyst supports. Described is a method of producing mesoporous γ-Al₂O₃ for catalytic systems, involving precipitation of hydroxides. Initial reagent used is Al(NO₃)₃⋅9H₂O, from which is prepared diluted aqueous solution with concentration of ~0.2 M. Aluminum hydroxide is precipitated by pouring solution NH₄OH (~1 M) at rate of 1–2 ml/min into the aluminum nitrate solution while continuously stirring. Reaction vessel is kept at pH 9.0–9.5. To prevent dissolution of formed Al(OH)₃, NH₄Cl solution is used. Then, the aluminum hydroxide precipitate is cryochemical treated in a freezing chamber at -25 °C for 24 hours. Obtained xerogel is subjected to sublimation drying at 25°C and pressure of 30 Pa. Further, obtained powder precursor AlOOH is exposed to thermal decomposition at 600 °C for 1 hour.

EFFECT: obtaining finely dispersed mesoporous powder γ-Al₂O₃, which has a unimodal distribution of pores by size and has a large volume of slot-like pores.

1 cl, 7 dwg, 2 tbl, 1 ex