The effect of thermal pre‐treatment of iron(III) oxides on thier reactivity has been studied together with the studies of some of their physical properties. Cadmium ferrite formation slightly increased when the iron(III) oxide was sintered between 550 and 680°C and markedly decreased above 700°C. The effect of thermal pretreatment appeared more pronouncedly when reactions were carried out at the temperature of the sintering. Between 550 and 750°C the highest conversion was found when iron(III) oxide was sintered and brought into reaction at about 700°C. The reactivity of iron(III) oxide was investigated also in other reactions: solubility in HCl and catalytic decomposition of H2O2. On the basis of density and electric conductivity data the high reactivity of Fe2O3 exhibited between 675 and 700°C was interpreted by the great increase of iron vacancies.
ASJC Scopus subject areas
- Inorganic Chemistry