Selective oxidation of propylene to propylene oxide or propionaldehyde over au supported on titanosilicates in the presence of H2 and O2

Abstract

Gas phase selective oxidation of propylene to propylene oxide (PO) or propionaldehyde (PA) in the presence of H2 and O2 has been carried out with a propylene conversion in the range of 0.5-3.7% over gold deposited on titanosilicates hy 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 thoroughly washed catalysts with low Au loadings.