An improved deposition method was employed to prepare a Pd/CeO₂ catalyst, which exhibited highly efficient activity in low-temperature CO oxidation (LTO). By controlling the preparation conditions, a series of different morphologies and Pd species could be obtained to clarify the structure–activity relationship in the reaction. BET, XRD, STEM, HRTEM, XPS, Raman spectra, H₂-TPR, CO/O₂ transient pulse experiments and in situ DRIFTS were used to characterize the catalysts. It was found that Pd²⁺ was incorporated in CeOx vacancies, while calcination facilitated the intimate mixing of Pd, O and Ce. HRTEM and STEM results showed that a special flattened Pd–Ce binary oxide cluster was achieved and evenly anchored on the CeO₂ surface, then CO adsorption and oxygen oxidation occured simultaneously on the cluster, leading to extremely high activity.

中文翻译：

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确定扁平的Pd-Ce氧化物团簇是用于低温CO氧化的高效催化剂†

采用改进的沉积方法制备了Pd / CeO ₂催化剂，该催化剂在低温CO氧化（LTO）中表现出很高的活性。通过控制制备条件，可以获得一系列不同的形态和Pd种类，以阐明反应中的结构活性关系。使用BET，XRD，STEM，HRTEM，XPS，拉曼光谱，H ₂ -TPR，CO / O ₂瞬态脉冲实验和原位DRIFTS表征催化剂。发现Pd ²⁺CeOx空位中掺入了Cd，而煅烧则促进了Pd，O和Ce的紧密混合。HRTEM和STEM结果表明，获得了一个特殊的扁平Pd-Ce二元氧化物簇，并将其均匀地锚定在CeO ₂表面上，然后在该簇上同时发生了CO吸附和氧氧化，从而具有极高的活性。