Catalytic Activity of Sn–Mo Oxides for Propene Oxidation

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Abstract
Sn–Mo oxides were subjected to experimental studies with reference to their catalytic C3H6 oxidation and their own reduction by C3H6. In the oxidation Sn–Mo oxides are 30–40 times more active than MoO3 but only 4–5 times than SnO2. With Sn–Mo oxides as well as SnO2, the oxidation is zero order in C3H6 and about half order in O2, in contrast to those with MoO3. It is proposed that the oxidation proceeds via a redox mechanism with the reduction step proceeding very rapidly. 18O tracer experiments show that the mobility of lattice oxygen in Sn–Mo oxides is lower than that in MoO3 but similar to that in SnO2. From these results together with those of structural studies, it is concluded that the active phase of Sn–Mo oxides is characterized by the MoO3 highly dispersed on SnO2 or Mo ions dissolved in SnO2, and that their high reducibility possibly originates from the existence of SnO2 itself in them.

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