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Preparation of TiO2–ZrO2/Au/CeO2 hollow sandwich-like nanostructures for excellent catalytic activity and thermal stability

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Abstract

This work reports a novel type of sandwich-like hollow Au-based nanocatalyst, including a TiO2–ZrO2 shell, a hollow CeO2 core and Au nanoparticles of 2–5 nm. Uniform crystal ceria hollow nanostructures were synthesized using a simple one-step hydrothermal method without a template. Then binary TiO2–ZrO2 coated Au nanocatalysts were prepared via a facile bottom-up synthesis method. The structural features of the catalysts were characterized by several techniques, including SEM, TEM, EDX, FTIR, BET, XRD, UV-vis and XPS analyses. Using the reduction of 4-nitrophenol by NaBH4 as a model reaction, the TiO2–ZrO2/Au/CeO2 microspheres showed a superior catalytic activity and thermal stability compared with a pure TiO2 or ZrO2 layer. In addition, TiO2–ZrO2/Au/CeO2 microspheres calcined at 700 °C presented the highest thermal stability and reactivity. These comparative results were mainly attributed to the synergistic effect among the mixed oxide, hollow CeO2 core and Au NPs and the sandwich-like structure. As a consequence, this unique nanocatalyst will open a promising route for the fabrication of hollow binary-metal-oxide materials for future research and has great potential for other applications.

Graphical abstract: Preparation of TiO2–ZrO2/Au/CeO2 hollow sandwich-like nanostructures for excellent catalytic activity and thermal stability

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Publication details

The article was received on 23 Sep 2017, accepted on 08 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7NJ03639F
Citation: New J. Chem., 2017, Advance Article
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    Preparation of TiO2–ZrO2/Au/CeO2 hollow sandwich-like nanostructures for excellent catalytic activity and thermal stability

    M. Huang, Y. Zhang, Y. Zhou, C. Zhang, S. Zhao, J. Fang, Y. Gao and X. Sheng, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ03639F

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