Preparation of CeO 2 nano-support in a novel rotor–stator reactor and its use in Au-based catalyst for CO oxidation

CeO2 nano-support was prepared by the reaction of water-in-oil microemulsion with NH3 gas in a rotor–stator reactor (RSR). The influences of different parameters including reaction temperature, rotation speed and final pH of the suspension on the properties of the CeO2 nano-support were investigated by BET and XRD. CeO2 nano-support with a diameter of about 5nm, size distribution of 4–6nm and specific surface area of 104m2/g was obtained under the optimum operating conditions of reaction temperature of 40°C, rotation speed of 800rpm and final pH of the suspension of 11 and was deposited with Au for CO oxidation reaction. The results demonstrated that CeO2 nano-support prepared by the microemulsion-gas method in the RSR had a small particle size and narrow size distribution and showed high catalytic activity after it was deposited with Au. Full CO conversion was achieved at 115°C by using the as-prepared Au/CeO2 catalyst.