Tracer studies of catalytic oxidation by bismuth molybdate: II. Propylene reduction of labeled catalysts and catalytic oxidation of propylene

Abstract

Differently 18O-labeled bismuth molybdate catalysts were prepared by the solid-state reaction from 18O-enriched bismuth and molybdenum oxides. The results of the propylene reduction of the catalysts and the catalytic oxidation of propylene clearly demonstrated that the oxygen atom in the acrolein formed comes from the (Bi 2O 2) n 2+ layer whether or not the gaseous oxygen is present. During the catalytic oxidation, the oxide ions consumed by the reaction seem to be replenished by gaseous oxygen through the (MoO 2) n 2+ layer.