For catalytic system consists of Pd as active component and CeO₂-ZrO₂/Al₂O₃ (CZ/A) as support, the dispersion and oxidation state of Pd species, which are crucial to the catalytic performance, are closely related to the metal-support interaction. In this work, Pd species were introduced into CZ/A system at different thermal treating stages of the support, which brought about different Pd–CZ interaction. The characterization results reveal that when CZ/A support was thermal treated at 300°C prior to the introduction of Pd species, a special Pd/CZ/A catalyst with Pd species semi-embedded in CZ/A was acquired, which exhibits excellent thermal stability owing to the appropriate Pd–CZ interaction. During thermal aging process, encapsulation and aggregation of Pd species are effectively inhibited for Pd/CZ/A with semi-embedded structure. Thus, higher dispersion, more oxidative Pd²⁺ species and larger amount of oxygen vacancies are maintained after aging, which consequently lead to its superior three-way catalytic performance.

对于以Pd为活性成分，CeO ₂ -ZrO ₂ / Al ₂ O ₃（CZ / A）为载体的催化体系，Pd的分散和氧化态与催化性能密切相关。金属与载体的相互作用。在这项工作中，在支持物的不同热处理阶段，将Pd物种引入CZ / A系统中，从而带来了不同的Pd-CZ相互作用。表征结果表明，当CZ / A载体在300℃下进行热处理时在引入Pd物种之前，先用°C进行了处理，然后获得了一种特殊的Pd / CZ / A催化剂，其中Pd物种半嵌入CZ / A中，由于适当的Pd-CZ相互作用，它具有出色的热稳定性。在热老化过程中，具有半嵌入式结构的Pd / CZ / A有效抑制了Pd的包封和聚集。因此，老化后保持较高的分散度，较多的氧化性Pd ²⁺种类和较大的氧空位，因此导致其优异的三元催化性能。