Abstract
The mild oxidation of propylene has been studied on oriented and non-oriented supported MoO3 catalysts. In the case of the oriented MoO3–graphite catalysts, the orientation of the MoO3 crystallites and catalytic properties are strongly dependent on preparation conditions.Reaction specificity of the MoO3 crystalline faces has been observed. By radiocrystallographic and electron-microscopy studies it has been possible to identify the reactive faces. Catalytic studies have allowed us to suggest that, at low conversion, acrolein and carbon dioxide issue from different catalytic sites; these are situated on the (100) MoO3 faces for acrolein and on the (010) MoO3 faces for carbon dioxide.On the basis of stereochemical and electronic considerations, a mechanism for the oxidation of propylene to acrolein on the (100) MoO3 face has been proposed.
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