Abstract
The selective oxidation of propene to propenal has been investigated for two series of molybdenum-tungsten oxide catalysts. The first series had the general formula Mo x W 1 − x O 3 and a WO 3-like structure, while members of the second series of general formula (Mo x W 1 − x ) n O 3 n − 1 had crystallographic shear structures. Members of the latter series showed a higher conversion and selectivity than the corresponding members of the first series. Selectivity was found to decrease as the tungsten content increased and as the density of crystallographic shear planes decreased. In situ oxidation of the reduced series (Mo x W 1 − x ) n O 3 n − 1 resulted in little change in selectivity but a significant fall in conversion.
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