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首页> 外文期刊>RSC Advances >Synthesis of a hierarchical SiO2/Au/CeO2 rod-like nanostructure for high catalytic activity and recyclability
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Synthesis of a hierarchical SiO2/Au/CeO2 rod-like nanostructure for high catalytic activity and recyclability

机译：SiO2 / Au / CeO2分层棒状纳米结构的合成，具有高催化活性和可回收性

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摘要

Uniform hierarchical SiO2/Au/CeO2 rod-like nanostructures were successfully fabricated by combining three individual synthesis steps, in which sub-5 nm gold nanoparticles (Au NPs) were coated with a mesoporous CeO2 shell. This method involves preparation of rod-like silica particles, deposition of Au NPs through a self-assembly procedure and then sequential deposition of CeO2 layers. To investigate the catalytic structure, the obtained sample was characterized by several techniques, including transmission electron microscopy (TEM), X-ray powder diffraction (XRD), N-2 adsorption-desorption isotherms (BET), and UV-vis diffuse reflection spectroscopy. It was found that SiO2/Au/CeO2 possessed an integral core shell structure including encapsulated Au NPs as core and mesoporous CeO2 as shell. Meantime, the inner silica plays an important role in the morphology control and improvement of the catalyst mechanical strength. The sample shows unique features such as uniform rod-like morphology, well dispersed Au NPs, and large specific surface area. The results of reaction performance indicate that the synthesized SiO2/Au/CeO2 catalysts exhibit significantly enhanced catalytic activity. Moreover, the catalytic activity of our as-prepared nanocomposite catalysts was well maintained even after 8 repeated cycles. It is clear that the core-shell composites can be used as effective nanoreactors with superior catalytic activity and recyclability due to their unique structural features.
机译：通过结合三个单独的合成步骤成功地制造出均匀的SiO2 / Au / CeO2分层分层棒状纳米结构，其中亚5 nm金纳米颗粒（Au NPs）涂有介孔CeO2壳。该方法包括制备棒状二氧化硅颗粒，通过自组装程序沉积金纳米颗粒，然后依次沉积CeO2层。为了研究催化结构，使用透射电子显微镜（TEM），X射线粉末衍射（XRD），N-2吸附-解吸等温线（BET）和UV-vis漫反射光谱等多种技术对获得的样品进行了表征。 。发现SiO2 / Au / CeO2具有完整的核壳结构，其中包封的Au NPs为核，中孔CeO2为壳。同时，内部二氧化硅在形态控制和提高催化剂机械强度方面起着重要作用。样品显示出独特的特征，例如均匀的棒状形态，分散良好的金纳米颗粒和较大的比表面积。反应性能的结果表明，合成的SiO2 / Au / CeO2催化剂具有明显增强的催化活性。此外，即使经过8个重复循环，我们所制备的纳米复合催化剂的催化活性也得到了很好的维持。显然，由于其独特的结构特征，核-壳复合材料可用作具有优异的催化活性和可回收性的有效纳米反应器。

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