The effects of Zr doping on the existence of Cu and the catalytic performance of Ce_0.7−xZr_xCu_0.3O₂ for CO oxidation were investigated. The characterization results showed that all samples have a cubic structure, and a small amount of Zr doping facilitates Cu²⁺ ions entering the CeO₂ lattice, but excessive Zr doping leads to the formation of surface CuO crystals again. Thus, the number of oxygen vacancies caused by the Cu²⁺ entering the lattice (e.g., Cu²⁺-□-Ce⁴⁺; □: oxygen vacancy), and the amount of reducible copper species caused by CuO crystals, varies with the Zr doping. Catalytic CO oxidation tests indicated that the oxygen vacancy and the reducible copper species were the adsorption and activation sites of O₂ and CO, respectively, and the cooperative effects between them accounted for the high CO oxidation activity. Thus, the samples x = 0.1 and 0.3, which possessed the most oxygen vacancy or reducible copper species, showed the best activity for CO oxidation, with full CO conversion obtained at 110 ^°C. The catalyst is also stable and has good resistance to water during the reaction.

研究了Zr掺杂对Cu存在的影响以及Ce _{0.7- x} Zr _x Cu _0.3 O ₂对CO氧化的催化性能。表征结果表明，所有样品均具有立方结构，少量的Zr掺杂有利于Cu ²⁺离子进入CeO ₂晶格，但过量的Zr掺杂导致表面再次形成CuO晶体。因此，由 Cu ²⁺进入晶格引起的氧空位数量（例如，Cu ²⁺ -□-Ce ⁴⁺; □：氧空位），以及由 CuO 晶体引起的可还原铜物种的数量，随 Zr 掺杂而变化。催化CO氧化试验表明氧空位和可还原铜物种分别是O ₂和CO的吸附和活化位点，它们之间的协同作用是CO氧化活性高的原因。因此，具有最多氧空位或可还原铜物种的样品x = 0.1 和 0.3 表现出最佳的 CO 氧化活性，在 110 ^° C 下获得了完全的 CO 转化。催化剂也很稳定，具有良好的耐水性在反应过程中。