In this study, catalysts with different loadings of CuO supported on TZ20 (TiO₂:ZrO₂ = 80:20) composite oxides were prepared by the co-precipitation method and characterized by XRD, TEM, and H₂-TPR measurements, and N₂O decomposition experiments were conducted to determine the number of Cu sites. In addition, the relationship between the CuO states and CO oxidation activities of CuO/TZ20 was revealed. In our previous study, the CO oxidation activities of the CuO catalysts were as high as those observed for precious metal catalysts after simulated diesel exhaust aging tests. The TZ20 surface is covered with three types of Cu species. These species change with increasing CuO loading, going from isolated Cu²⁺, CuO layer, and finally to CuO particles at high CuO loadings. The CuO layer was the most readily reduced, as well as the most active site for CO oxidation. The amount of Cu forming CuO layers increased with increasing CuO loading; however, at CuO loadings larger than 5 wt%, the amount of Cu forming CuO layers and the CO oxidation activity both remained constant. Additionally we indicated that adjusting the calcination condition caused the redispersion of CuO particles to the CuO layer and had the potential to improve the CO oxidation activities of CuO/TZ20.

在这项研究中， 通过共沉淀法制备了负载在TZ20（TiO ₂：ZrO ₂ = 80:20）复合氧化物上的CuO负载量不同的催化剂，并通过XRD，TEM和H ₂ -TPR测量以及N对催化剂进行了表征。_进行2 O分解实验以确定Cu位的数量。另外，揭示了CuO状态与CuO / TZ20的CO氧化活性之间的关系。在我们之前的研究中，经过模拟的柴油机排气老化试验，CuO催化剂的CO氧化活性与贵金属催化剂的CO氧化活性一样高。TZ20表面覆盖有三种类型的Cu。这些物种会随着CuO含量的增加而发生变化，这是由孤立的Cu ²⁺，CuO层，最后是高CuO含量的CuO颗粒。CuO层是最容易还原的，也是CO氧化最活跃的位置。Cu形成的CuO层的数量随CuO含量的增加而增加; 然而，在大于5wt％的CuO负载下，形成CuO层的Cu的量和CO氧化活性均保持恒定。此外，我们指出，调节煅烧条件会导致CuO颗粒重新分散到CuO层，并具有改善CuO / TZ20的CO氧化活性的潜力。