2(AlCl3•6H2O) Al2O3 + 6HCl + 9H2O
or
2[Al(H2O)6]Cl3 Al2O3 + 6HCl + 9H2O [16]
The thermal decomposition of hexahydrate aluminum chloride to produce aluminum oxide, hydrogen chloride and water. This reaction takes place at a temperature of 200-450°C.[8]