Abstract
The effect of alkali elements incorporated into a magnesium-molybdenum system containing iron and bismuth ions on the structure and catalytic activity in isobutylene oxidation to methylacrolein was studied. It was found by Mössbauer spectroscopy and EPR that potassium and cesium ions are capable of rearranging the iron molybdate structure to form a substituted garnet, whereas the lithium and sodium ions exhibit no such effect. The iron ions were found to interact in the modified system. Comparison of data on structure with the catalysis results revealed that the structural rearrangement of iron molybdate in a complex oxide catalyst increases the process selectivity, due to changes in the lattice oxygen state.
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