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Ternary catalysts, namely CuO–CoOx–CeO2, are prepared by coprecipitation with different pH and characterized by techniques such as N2 adsorption/desorption, XRD, TPR, TEM and XPS. The results show that pH plays a crucial role in determining the physicochemical properties such as surface area, particle sizes and valence states of the elements on the surface of the catalysts. It can also be found that suitable pH values may facilitate the formation of Cu+ and the redox recycle of Cu2+ to Cu+ due to the synergistic effect between copper oxide and the support such as cobalt oxide and ceria, which, as a result, is beneficial to achieve CuO–CoOx–CeO2 with high catalytic performance for CO oxidation.
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