Preparation of CeO2 nano-support in a novel rotor–stator reactor and its use in Au-based catalyst for CO oxidation

• A rotor–stator reactor (RSR) was used for nano-support preparation.
• CeO2 nano-support was prepared by microemulsion-gas method in the RSR.
• The CeO2 nano-support had a narrow size distribution and a high specific surface area.
• Au/CeO2 catalyst was prepared by using the CeO2 nano-support.
• Full CO conversion was achieved at 115 °C by using the Au/CeO2 catalyst.

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 5 nm, size distribution of 4–6 nm and specific surface area of 104 m2/g was obtained under the optimum operating conditions of reaction temperature of 40 °C, rotation speed of 800 rpm 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.

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