High performance BaCO3-CeO2 composite catalyst for solvent-free selective oxidation of cyclohexane with molecular oxygen

BaCO 3 -CeO 2 composite catalysts were prepared by the hydrothermal synthesis method, and the influence of Ba/Ce on the structural and catalytic performance for selective oxidation of cyclohexane with molecule oxygen was studied. The characterization results exhibited that the doping amount of BaCO 3 would influence the morphology, the content of surface Ce 3+ and surface oxygen species (O β ), and alkalinity. Meanwhile, the amount of alkali is the key to the decomposition of cyclohexyl hydrogen peroxide (CHHP). 10.5% conversion of cyclohexane and 85.0% selectivity of KA oil were achieved under the reaction conditions of 1.0 MPa O 2 and 150 °C for 2 h. The excellent catalytic activity was attributed to its high atomic ratios of Ce 3+ /Ce total and O β /O total on the surface and optimal redox capacity.