Direct conversion of bio-ethanol to propylene in high yield over the composite of In2O3 and zeolite beta

The superior propylene yield of the In₂O₃-beta composite (ca. 50%) for the conversion of ethanol to propylene compared to In₂O₃ (ca. 32%) is due to the fact that zeolite beta in the composite enhances the conversion of the intermediate of acetone to propylene via an additional pathway.