ALUMINUM HYDROXIDE Russian patent published in 2021 - IPC C01F7/44 C01F7/02 B01J20/08 B01J21/04 B01J23/10 B01J32/00 B01J35/10 B01J37/02 

FIELD: chemical industry.

SUBSTANCE: invention can be used in the production of aluminum oxide adsorbents, desiccants, catalyst carriers and catalysts. Aluminum hydroxide with the general formula Al₂O₃⋅nH₂O, where n=1.5-1.9, is proposed, which contains isolated La atoms on its surface, consisting in the chemical bond La-O-Al, with a surface density of 2-50 atoms per 10 nm² surface and the ratio of the number of Al atoms to the number of La atoms equal to 50-10000. Aluminum hydroxide consists of pseudoboehmite and a disordered χ-like phase of aluminum oxide in the following ratios, wt. %: pseudoboehmite 60-95, disordered χ-like phase of aluminum oxide 5-40. The content of constitutional water is 22-25 wt. %. The specific surface area after calcination at 550°C is 200-300 m²/g, the average pore diameter is 8-15 nm, the pore volume is 0.45-0.75 cm³/g. Aluminum hydroxide is an agglomerate of particles with a volumetric average diameter from 5 to 100 microns.

EFFECT: invention makes it possible to increase the catalytic activity and selectivity of aluminum hydroxide, reduce the cost of obtaining it.

3 cl, 1 dwg, 1 tbl, 7 ex