Key words: supercritical water oxidation, aluminum oxide, structural changes
The results of an experimental study of aluminum oxidation with sub- and supercritical water in the range of 350—410 °C for 60—300 min are presented. It is shown that aluminum hydroxides and oxides with a developed surface are formed as a result of oxidation. A non-monotonic dependence of the specific surface area of the oxidation products on the process temperature is revealed, caused by the formation of various compounds and phases of aluminum oxide. Calcination of the oxidation products at 550 °C leads to the formation of γ-, χ- and α-phases of Al2O3 in a ratio determined by the temperature and time of oxidation in a water fluid.
doi:10.1134/S1990793125701210