Au–CeO₂ catalysts are prepared from amorphous Ce–Al alloys by the dealloying method, and their catalytic performances are examined in the oxidation of benzyl alcohol to benzaldehyde using O₂ as an oxidant. The catalytic activity of the Au–CeO₂ catalysts is improved using an amorphous alloy as a precursor, and further improved activity is attained by directly alloying Au with Ce–Al rather than by depositing Au on preformed CeO₂. Consequently, Au–CeO₂ prepared directly from an amorphous Au–Ce–Al alloy exhibits the highest activity among the prepared samples, despite its low surface area. Detailed characterization by means of XPS analysis indicates that most of the Au species in Au–CeO₂ prepared from the amorphous Au–Ce–Al alloy exist in a +1 oxidation state (Au⁺). The presence of Au⁺ facilitates the migration of oxygen atoms through the lattice, which likely contributes to the high catalytic activity of the Au–CeO₂ catalyst.

中文翻译：

---

非晶态合金制备的纳米多孔Au-CeO ₂催化剂对苄醇的氧化作用及Au与非晶态合金化的影响

Au-CeO ₂催化剂是通过脱合金方法由无定形的Ce-Al合金制备的，在使用O ₂作为氧化剂将苄醇氧化为苯甲醛的过程中，研究了它们的催化性能。使用非晶态合金作为前体可以提高Au-CeO ₂催化剂的催化活性，并且通过直接将Au与Ce-Al合金化而不是在预先形成的CeO ₂上沉积Au可以进一步提高活性。因此，尽管表面积很小，但直接由非晶态Au-Ce-Al合金制备的Au-CeO ₂表现出最高的活性。通过XPS分析的详细表征表明，Au–CeO _2中的大多数Au物种由非晶Au-Ce-Al合金制备的合金以+1氧化态（Au ⁺）的形式存在。Au ⁺的存在促进了氧原子通过晶格的迁移，这可能有助于Au-CeO ₂催化剂的高催化活性。