In this paper, a series of Rh/CeO₂ catalysts with three-dimensional porous nanorod frameworks and large specific surface area were prepared by chemical dealloying Al–Ce–Rh precursor alloys and then calcining in pure O₂. The effects of the Rh content and calcination temperature on CO oxidation and CH₄ combustion were studied, and the results reveal that the Rh/CeO₂ catalysts produced by dealloying melt-spun Al_91.3Ce₈Rh_0.7 alloy ribbons and then calcining at 500 °C exhibit the best catalytic activity, the reaction temperatures for the complete conversion of CO and CH₄ are as low as 90 and 400 °C, respectively. Furthermore, after 150 h of continuous testing at high concentrations of H₂O and CO₂, the nature of the catalyst is not irreversibly destroyed and can still return to its initial level of activity. This excellent catalytic activity is attributed to a portion of Rh being uniformly distributed on the CeO₂ nanorod surface in the form of nanoparticles, forming strong Rh–CeO₂ interfacial synergy. Another portion of Rh permeated into the CeO₂ lattice, which results in a significant increase in the number of oxygen vacancies in CeO₂, thus allowing more surface active oxygen to be adsorbed and converted from the gas phase. Moreover, the catalytic reaction can proceed even in an oxygen-free environment due to the excellent oxygen storage performance of the Rh/CeO₂ catalyst.

本文通过对Al-Ce-Rh前驱体合金进行化学脱合金，然后在纯O ₂中煅烧，制备了一系列具有三维多孔纳米棒骨架和大比表面积的Rh/CeO ₂催化剂。研究了Rh含量和煅烧温度对CO氧化和CH ₄燃烧的影响，结果表明，将熔纺Al _91.3 Ce ₈ Rh _0.7合金带脱合金，然后在500°煅烧制备Rh/CeO _{2催化剂。 C表现出最好的催化活性，CO和CH 4}完全转化的反应温度分别低至 90 和 400 °C。此外，在高浓度 H ₂ O 和 CO ₂下连续测试 150 小时后，催化剂的性质并未受到不可逆转的破坏，仍可恢复到其初始活性水平。这种优异的催化活性归因于一部分Rh以纳米颗粒的形式均匀分布在CeO ₂纳米棒表面，形成强烈的Rh-CeO ₂界面协同作用。另一部分Rh渗透到CeO ₂晶格中，导致CeO _{2中氧空位的数量显着增加}，从而允许更多的表面活性氧从气相中被吸附和转化。_{此外，由于Rh/CeO 2}催化剂优异的储氧性能，催化反应甚至可以在无氧环境中进行。