Abstract
The structural changes of iron—molybdenum mixed oxide systems during calcination and reduction were studied. The oven-dried precipitated mass contains excess molybdenum as polymolybdic ions, which is transformed into Fe 2(MoO 4) 3 and MoO 3 on heat-treatment of the sample above 400°C. The reduction of Fe 2(MoO 4) 3 proceeds through the formation of FeMoO 4 and FeMoO 3. On complete reduction, it gives a mixed crystal of iron and molybdenum. MoO 3 is also simultaneously reduced to elemental molybdenum through the formation of MoO 2 as an intermediate oxide. The interaction of the reduced mass with synthesis gas indicates that the iron—molybdenum mixed crystal is active for the hydrogenation of CO molecules. This mixed lattice is also stable towards the carburization process under synthesis gas.
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