Effect of oxygen vacancy on the oxidation of toluene by ozone over Ag-Ce catalysts at low temperature

Two Ag/CeO2 catalysts were prepared using impregnation and in-situ reduction methods. Comparing with CeO2 and Ag/CeO2-IM, Ag/CeO2-IR exhibits significantly better activity of toluene oxidation with ozone. The results reveal that the different Ag loading methods result in different interactions between Ag and CeO2, and thereby leads to different amounts of surface and bulk oxygen vacancy of the catalysts. In-situ visible Raman results show that surface oxygen vacancy plays a key role in ozone catalytic oxidation of toluene. The Ag and CeO2 active components were further dispersed on the molecular sieve to prepare the Ag-CeO2/BEA catalysts and the performance was investigated with and without water.