CATALYTIC ACTIVITY OF Sn-Mo OXIDES FOR PROPENE OXIDATION.

Article abstract of DOI:10.1246/bcsj.56.1284

Sn-Mo oxides were subjected to experimental studies with reference to their catalytic C//3H//6 oxidation and their own reduction by C//3H//6. In the oxidation, Sn-Mo oxides are 30-40 times more active than MoO//3 but only 4-5 times more active than SnO//2. With Sn-Mo oxides as well as SnO//2, the oxidation is zero order in C//3H//6 and about half order in O//2, in contrast to those with MoO//3. It is proposed that the oxidation proceeds via a redox mechanism with the reduction step proceeding very rapidly. **1**8O tracer experiments show that the mobility of lattice oxygen in Sn-Mo oxides is lower than that in MoO//3 but similar to that in SnO//2. Fromthese results together with those of structural studies, it is concluded that the active phase of Sn-Mo oxides is characterized by the MoO//3 highly dispersed on SnO//2 or Mo ions dissolved in SnO//2, and that their high reducibility possibly orignates from the existence of SnO//2 itself in them.