Abstract
Boehmite (γ-AlOOH) powder was first prepared by sol-freeze drying method using inexpensive AlCl 3.6H 2O as raw material, and then γ-Al 2O 3 nanopowder with average diameter of 6 nm and α-Al 2O 3 nanopowder with mean diameter of 30 nm were obtained by the calcination of the above γ-AlOOH powder at 500 °C and 1100 °C, respectively. Potential-pH diagrams of Al-H 20 system at 25 °C and 90 °C were obtained, separately. Thermodynamic analysis of the main reactions in the process of thermal decomposition of Al(OH) 3 was also made using Temkin-Schwarzman's method and by means of regression analysis. Investigations of the potential-pH diagrams of Al-HO system and the thermodynamic analysis of thermal decomposition of Al(OH) 3 provide a guide to the formation of boehmite sol and heat treatment of boehmite powder, respectively.
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