Abstract: Three different Ce_0.6Zr_0.4O₂ solid solutions were prepared by the co-precipitation method combined with room temperature aging, conventional heating reflux, and microwave-assisted heating reflux and used as the supports to prepare CuO catalysts by an impregnation method. The textural and reductive properties of the Ce_0.6Zr_0.4O₂ supports and CuO/Ce_0.6Zr_0.4O₂ catalysts were characterized by N₂ adsorption, X-ray diffraction, and temperature-programmed reduction by hydrogen. In addition, the catalytic activity of the catalysts for CO low-temperature oxidation was tested. The results showed that the support prepared by the microwave-assisted method has the largest surface area and pore volume (170.8 m²/g and 0.408 cm³/g, respectively), and the CuO species loaded exhibited good dispersion and reducibility, which resulted in a high catalytic activity of the corresponding CuO/Ce_0.6Zr_0.4O₂ catalyst for CO low-temperature oxidation.

Key words: cerium-zirconium solid solution, microwave, heating reflux, carbon monoxide, low-temperature oxidation, copper oxide catalyst