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Synthesis of a hollow CeO2/Au/C hierarchical nanostructure for high catalytic activity and recyclability

机译:用于高催化活性和可回收性的空心CeO2 / Au / C分层结构的合成

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We report uniform hollow CeO _(2) /Au/C nanocatalysts with hierarchical structures fabricated successfully via an etching process. The whole preparation method involves the synthesis of SiO _(2) spheres, a sequential deposition of CeO _(2) , Au NPs of 2–5 nm and then C layers through hydrothermal processes, crystallization of C by calcination and finally etching of the inner silica spheres to construct the hollow structures. The as-obtained nanostructures are characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD), UV-Vis spectroscopy and energy dispersion X-ray spectroscopy (EDX). The CeO _(2) /Au/C composite shows a multilayer structure including the hollow ceria spheres and the C layers, where Au NPs are located between the two layers. In this work, the reduction of 4-NP is employed as a model reaction to test the catalytic performance. The results indicate that the hollow CeO _(2) /Au/C nanospheres exhibit a higher catalytic performance, comparing with the hollow CeO _(2) /Au and Au/C nanospheres. The presences of the C shells and CeO _(2) layers can improve the catalytic activity. In addition, the hollow CeO _(2) /Au/C structures can be easily recycled without an obvious decrease of the catalytic activities in the reaction.
机译:我们通过蚀刻工艺报告具有成功制造的等级结构的均匀空心CeO_(2)/ Au / c纳米催化剂。整个制备方法涉及SiO_(2)球的合成,CeO _(2)的顺序沉积,2-5nm的Au NP,然后通过水热过程,通过煅烧结晶C,最后蚀刻蚀刻内硅球构造空心结构。通过透射电子显微镜(TEM),扫描电子显微镜(SEM),X射线衍射(XRD),UV-Vis光谱和能量分散X射线光谱(EDX)的特征在于,所获得的纳米结构的特征在于。 CEO _(2)/ AU / C复合材料显示了一种多层结构,包括中空芯片球和C层,其中Au nps位于两层之间。在这项工作中,使用4-NP的减少作为测试催化性能的模型反应。结果表明,中空CeO_(2)/ Au / C纳米载体表现出更高的催化性能,与空心CeO_(2)/ Au和Au / C纳米球相比。 C壳和CEO _(2)层的含量可以改善催化活性。此外,空心CEO_(2)/ AU / C结构可以容易地再循环,而不明显降低反应中的催化活性。

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