ABSTRACT
A great number of different mono-, and multicomponent oxide systems have been studied as catalysts in allylic oxidation of propene and many of them have been patented. The most important are those based on two component oxides, one of these components being bismuth, uranium, tin, or iron oxide, and the other component the oxide of molybdenum, tungsten, or antimony. These systems may form definite chemical compounds of the oxy salt type as bismuth molybdates and uranium antimonates, or they may constitute solid solutions as in the case of tin-antimony oxide. By far the most extensively studied are the catalysts based on Bi203 and Mo03, which serve as the basis for many of today's highly active and selective commercial catalytic systems.
