Effect of mechanochemical treatment on the structure and physicochemical properties of MoO3

Determination of molybdenum oxidation state on the mechanochemically treated MoO3

“…It could be explained by increasing specific surface area [1][2][3][4], exposition of different crystallographic planes (structure sensitivity of MoO 3 in partial oxidation of propylene [15,16]), and different nonstoichiometric phase of MoO 3 , which provided after mechanochemical treatment. It was found [17,18] that in the presence of reduced phase Magnelly χ-Mo 8 O 23 in catalyst, it demonstrated high parameters in oxidation of benzene to phenol.…”

Mechanochemistry in heterogeneous catalysis

“…The increase in the activity of vanadium pentoxide after mechanochemical treatment in the oxidation of propane and n-butane was also attributed to the formation of reduced vanadium V 4+ on the surface [54]. It should be noted that the appearance of such structural defects as a result of the mechanochemical treatment of oxides has been reliably established but at room temperature (sometimes after preliminary drying at 120°C).…”

“…After mechanochemical treatment MoO 3 , which is normally inactive in the oxidation of paraffins, acquires high activity. The authors of [54] attribute the substantial promotion of the catalytic activity of MoO 3 to the formation of the nonstoichiometric phases MoO 2.8 and c-Mo 8 O 23 , containing reduced molybdenum, as a result of mechanical activation.…”

“…The mechanochemical activation of MoO 3 leads to the formation of a catalyst for the direct oxidation of benzene to phenol with molecular oxygen [54]. After mechanochemical treatment MoO 3 , which is normally inactive in the oxidation of paraffins, acquires high activity.…”

“…in particular are the main components of effective catalysts for the partial oxidation of various types hydrocarbons [41][42][43][44]. They naturally, therefore, became the subject for investigation of the effect of mechanical treatment on the physicochemical and catalytic characteristics of the oxides themselves and of complex systems based on them [45][46][47][48][49][50][51][52][53][54]. In the catalytic oxidation of hydrocarbons (n-butane, benzene) at V 2 O 5 that had been mechanically treated in ethanol the selectivity of the reaction with respect to maleic anhydride was substantially higher [53].…”