Efficient Removal of Formaldehyde by Nanosized Gold on Well-Defined CeO2 Nanorods at Room Temperature

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• 作者：Quanlong Xu ; Wanying Lei ; Xinyang Li ; Xiaoying Qi ; Jiaguo Yu ; Gang Liu ; Jinlong Wang ; Pengyi Zhang
• 刊名：Environmental Science & Technology
• 出版年：2014
• 出版时间：August 19, 2014
• 年：2014
• 卷：48
• 期：16
• 页码：9702-9708
• 全文大小：411K
• ISSN：1520-5851

文摘

Gold (Au) nanoparticles (NPs) supported on well-defined ceria (CeO₂) nanorods with exposed {110} and {100} facets were prepared by a deposition鈥損recipitation method and characterized by powder X-ray diffraction, micro-Raman spectroscopy, X-ray photoelectron spectroscopy, nitrogen adsorption鈥揹esorption, transmission electron microscopy, high-resolution transmission electron microscopy, and high-angle annular dark-field scanning transmission electron microscopy. Both nanometer and subnanometer gold particles were found to coexist on ceria supports with various Au contents (0.01鈥?.4 wt %). The catalytic performance of Au/CeO₂ catalysts was examined for formaldehyde (HCHO) oxidation into CO₂ and H₂O at room temperature and shown to be Au content dependent, with 1.8 wt % Au/CeO₂ displaying the best performance. On the basis of the results from hydrogen temperature-programmed reduction and in situ Fourier transform infrared spectroscopy observations, the high reactivity and stability of Au/CeO₂ catalysts is mainly attributed to the well-defined ceria nanorods with {110} and {100} facets which present a relatively low energy for oxygen vacancy formation. Furthermore, gold NPs could induce the weakened Ce鈥揙 bond which in turn promotes HCHO oxidation.