A highly active Pd/CeO₂-ZrO₂-Al₂O₃(Pd/CZAm) catalyst was successfully fabricated by optimizing the reducibility of CZAm support through a novel precipitation method. Pd/CZAm-a (aged catalyst) could maintain a superior activity, the T₉₀ (temperature for 90% conversion) of CO, NO and HC has decreased by 36 °C, 30 °C and 54 °C comparing with Pd/CZAc-a (reference catalyst). As characterized, the better activity of Pd/CZAm is associated closely with the advanced reducibility of CZAm support. By controlling the individual precipitation process of CZ and Al₂O₃ via two different precipitants, the CZAm which displays more homogeneous CZ structure, abundant surface and bulk oxygen defects manifested by XRD, Raman, XPS and TEM-EDS results has been successfully prepared without any additives and excess treatment. Then stronger interaction between CZAm and supported Pd species has been manifested by XPS, H₂-TPR and CO-IR results, which prevents the sintering and decomposition of PdO species during aging process. Consequently, Pd/CZAm-a could maintain the better dispersion of Pd species and more oxidized PdO with respect to Pd/CZAc-a.

通过新型沉淀法优化CZAm载体的还原性，成功制备了高活性Pd / CeO ₂ -ZrO ₂ -Al ₂ O ₃（Pd / CZAm）催化剂。Pd / CZAm-a（老化的催化剂）可以保持优异的活性，与Pd / CZAc相比，CO，NO和HC的T ₉₀（90％转化温度）降低了36°C，30°C和54°C -a（参考催化剂）。如所表征的，Pd / CZAm更好的活性与CZAm支持物的先进还原性密切相关。通过控制CZ和Al ₂ O ₃的单个沉淀过程通过两种不同的沉淀剂，已经成功地制备了CZAm，该CZAm显示出更均匀的CZ结构，丰富的表面和大量氧缺陷，这些缺陷表现为XRD，拉曼，XPS和TEM-EDS结果，没有任何添加剂和过度处理。XPS，H ₂ -TPR和CO-IR结果表明，CZAm与负载的Pd物种之间的相互作用更强，这防止了PdO物种在时效过程中的烧结和分解。因此，相对于Pd / CZAc-a，Pd / CZAm-a可以保持更好的Pd种类分散和更多的氧化PdO。