The Nature of Oxygen Species Responsible for Propene Oxidation over V–Mo and V–Sn Oxides

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Abstract
The rate of oxidation of C3H6 has been investigated over V–Mo oxides using 18O2(99%) tracer. The extent of participation of lattice oxygen in the oxidation increases with increasing MoO3 content, showing a maximum at V–Mo (33 mol% of MoO3) oxide. The rate of oxidation of C3H6 varies parallel to the extent of participation of lattice oxygen. A marked dependence of the rate of oxidation upon oxygen pressure observed with V–Mo(33) oxide is attributed to its high reducibility. Similar experiments have been carried out with V–Sn (94 mol% of SnO2) oxide. The rate of reduction of the oxide with C3H6 is about ten times smaller than that of the corresponding catalytic oxidation of C3H6, suggesting the participation of adsorbed oxygen in the oxidation. The results of 18O tracer experiments show participation of lattice oxygen in the oxidation. A mechanism which explains such conflicting results has been proposed.