With the increasing demand for highly efficient and durable catalysts, researchers have been doing extensive research to engineer the shape, size, and even phase (e.g., hcp or fcc Co) of individual catalyst nanoparticles, as well as the interface structure between the catalyst and support. In this work, cobalt oxides were deposited on ceria with rod-like morphology (CeO₂NR) and cube-like morphology (CeO₂NC) and silica with sphere-like morphology (SiO₂NS) via a precipitation–deposition method to investigate the effects of support morphology, surface defects, support reducibility, and the metal–support interactions on redox and catalytic properties. XRD, Raman, XPS, BET, H₂-TPR, O₂-TPD, CO-TPD, TEM, and TPR/TPO cycling measurements have been mainly employed for catalysts characterization. Compared with CeO₂NC and SiO₂NS supports, as well as CeO₂NC- and SiO₂NS-supported cobalt catalysts, CeO₂NR counterparts exhibited enhanced reducibility and CO oxidation performance at a lower temperature. Both the apparent activation energy and CO conversion demonstrated the following catalytic activity order: 10 wt % CoO_x/CeO₂NR > 10 wt % CoO_x/CeO₂NC > 10 wt % CoO_x/SiO₂NS. These results showed a strong support-dependent reducibility, CO oxidation, and redox cycling activity/stability of the as-prepared catalysts. Moreover, the significantly enhanced catalytic CO oxidation of the 10 wt % CoO_x/CeO₂NR catalyst indicated the vital role of CeO₂NR support with rich surface oxygen vacancies, superior oxygen storage capacity and mobility, and excellent adsorption/desorption behavior of CO and O₂ species.

中文翻译：

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CeO ₂和SiO ₂负载的钴催化剂中金属与载体的相互作用：载体形态，还原性和界面构型的影响

随着对高效，耐用催化剂的需求不断增加，研究人员已进行了广泛的研究，以工程化单个催化剂纳米颗粒的形状，尺寸甚至相（例如hcp或fcc Co），以及催化剂与催化剂之间的界面结构。支持。在这项工作中，通过沉淀沉积法将氧化钴沉积在具有棒状形态（CeO ₂ NR）和立方体状形态（CeO ₂ NC）的氧化铈和具有球形状形态（SiO ₂ NS）的二氧化硅上，以研究载体形态，表面缺陷，载体还原性以及金属与载体之间的相互作用对氧化还原和催化性能的影响。XRD，拉曼，XPS，BET，H ₂ -TPR，O ₂-TPD，CO-TPD，TEM和TPR / TPO循环测量主要用于催化剂表征。利用CeO相比₂ NC和SiO ₂ NS载体，以及以CeO ₂ NC-和SiO ₂ NS-负载的钴催化剂，的CeO ₂ NR同行表现出在较低温度下增强的还原和CO氧化性能。表观活化能和CO转化率均显示出以下催化活性顺序：10 wt％CoO _x / CeO ₂ NR> 10 wt％CoO _x / CeO ₂ NC> 10 wt％CoO _x / SiO ₂NS。这些结果表明，所制备的催化剂具有很强的依赖载体的还原性，CO氧化性和氧化还原循环活性/稳定性。此外，10 wt％CoO _x / CeO ₂ NR催化剂的催化CO氧化显着增强，表明CeO ₂ NR载体具有丰富的表面氧空位，优异的储氧能力和迁移率以及出色的CO吸附/解吸行为，具有至关重要的作用。和O ₂种。