Selective Oxidation of Propylene to Propylene Oxide or Propionaldehyde over Au Supported on Titanosilicates in the Presence of H2 and O2

Gas phase selective oxidation of propylene to propylene oxide (PO) or propionaldehyde (PA) in the presence of H2 and O2has been carried out with a propylene conversion in the range of 0.5-3.7% over gold deposited on titanosilicates by deposition-precipitation (DP) method; PO was obtained with a selectivity above 90% at the temperature range of 50 °C-120 °C whereas PA was obtained at temperatures higher than 200 °C with a selectivity above 70% over throughly washed catalysts with low Au loadings.