Abstract
The EPR, FTIR, and XRD techniques are used to examine individual and mixed vanadiummolybdenum oxides of composition (1 − x)V2O5: xMoO3 prepared by coprecipitation. The phase and structural heterogeneity of these oxides is characterized. The oxidation of toluene with air oxygen to maleic anhydride on V2O5 and mixed oxides involves singlet oxygen 1O2. A correlation between the content of V(IV) ions in the mixed catalysts and the amount desorbed 1O2 is observed. It is demonstrated that the oxidation of toluene causes changes in the spatial distribution of the V(IV) ions in the matrix and the phase composition of the samples.
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