NDLI: Hierarchical structures based on gold nanoparticles embedded into hollow ceria spheres and mesoporous silica layers with high catalytic activity and stability

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhou, Yuming Xu, Yuanmei Zhang, Chao Xiang, Sanming Sheng, Xiaoli Zhang, Yiwei Wang, Qianli
Copyright Year	2015
Abstract	A uniform hollow CeO2/Au@mSiO2 core–shell catalyst with a hierarchical structure was fabricated successfully. The preparation method involves the synthesis of high surface area and porous hollow CeO2 nanospheres, a sequential deposition of sub-10 nm Au nanoparticles to obtain CeO2/Au, coating the particles with mesoporous SiO2 shells through a sol–gel process and a calcination process at a desired temperature to obtain a mesoporous silica shell. The final obtained product was characterized by several techniques, including transmission electron microscopy (TEM), UV-Vis spectroscopy, X-ray diffraction (XRD) and energy dispersion X-ray spectroscopy (EDS). It is found that CeO2/Au@mSiO2 composite multifunctional materials have a multilayer structure and gold nanoparticles can be embedded into the hollow ceria sphere and the mesoporous silica layer. Compared with the solid CeO2/Au@mSiO2 catalyst, the hierarchical structures of the hollow CeO2/Au@mSiO2 possess open unique hierarchical pores to expose the catalytically active component, including the hollow central structure and mesopores from the CeO2 layer and the silica shell. The results of the reduction of 4-nitrophenol (4-NP) indicate that the synthesized hollow hierarchical catalysts exhibit superior catalytic performance to the traditional core–shell structure and can be easily recycled without a decrease of the catalytic activities in the reaction.
Starting Page	9372
Ending Page	9379
Page Count	8
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	39
Issue Number	12
Journal	New Journal of Chemistry
DOI	10.1039/c5nj01990g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray crystallography Mesoporous material 4-Nitrophenol Transmission electron microscopy Ultraviolet\u2013visible spectroscopy Sol\u2013gel process Mesoporous silica Dispersion relation Cerium(IV) oxide Calcination X-ray spectroscopy Silicon dioxide
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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