| Abstract: | Preparation and Properties of Formed Aluminium Oxide. I. Influence of the Precipitation Conditions of the Boehmite Hydrogel on the Pore Structure of Formed Aluminium Oxide A report is given on the influence of the precipitation conditions of boehmite (pH value, temperature, concentration and residence time in the precipitation suspension) on the cavity structure of aluminium oxide spheres, made by coagulation of boehmite hydrosol in ammonia liquor and subsequent thermal treatment at 110 and 600°C. The boehmite hydrogel was obtained at continuous precipitation conditions by neutralisation of sodium aluminate solution with nitric acid. It is shown that the difference in the pore structure of the formed aluminium oxide obtained by varying the precipitation conditions were caused by the special morphological features of the boehmite crystallization in the precipitation process. |
