Reactions of MnO2, Mn2O3, α-Bi2O3 and Bi12Ti1-xMnxO20 with supercritical isopropanol

Heterogeneous reactions between supercritical isopropanol and metal oxides were studied for the first time. The results demonstrate that Bi2O3 is reduced by isopropanol to metallic bismuth, while MnO2 and Mn2O3 are reduced to Mn3O4 (hausmannite). The possibility of oxygen extraction from nonstoichiometric oxides is demonstrated by the example of the reaction Bi12Ti1-xMnx5+O20+delta --> Bi12Ti1-xMnx2+O20-delta.