NDLI: A highly reactive and enhanced thermal stability nanocomposite catalyst based on Au nanoparticles assembled in the inner surface of $SiO_{2}$ hollow nanotubes

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A highly reactive and enhanced thermal stability nanocomposite catalyst based on Au nanoparticles assembled in the inner surface of $SiO_{2}$ hollow nanotubes

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A highly reactive and enhanced thermal stability nanocomposite catalyst based on Au nanoparticles assembled in the inner surface of $SiO_{2}$ hollow nanotubes

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Zhou, Yuming Yang, Zunbing Xiang, Sanming Zhang, Zewu Sheng, Xiaoli Zhou, Shijian Zhang, Yiwei
Description	Author Affiliation: Xiang S ( School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China. ymzhou@seu.edu.cn zhangchem@seu.edu.cn.)
Abstract	A novel hollow tubular $SiO_{2}–Au$ catalyst with a mesoporous structure (HTMS) was successfully fabricated by a combination of the sol–gel and calcination processes. This method involves the preparation of modified MWCNTs, the sequential deposition of Au and then silica layers through the sol–gel processes, and finally the calcination at the desired temperature to remove the MWCNTs. The obtained samples were characterized by several techniques, such as $N_{2}$ adsorption–desorption isotherms, transmission electron microscopy, energy-dispersive X-ray spectroscopy analysis, UV-Vis spectra, X-ray diffraction and Thermogravimetric Analysis (TGA). The results established that a different calcination temperature has an obvious influence on the morphology and structure of the final hollow tubular. When the temperature is 550 °C, the obtained materials exhibit the distinctly tubular structure because of the decomposition of MWCNTs and the preservation of hollow tubes. Furthermore, in the catalyst system, the mesoporous silica layer can act as the physical barrier to resist the agglomeration and sintering of Au nanoparticles even after being subjected to harsh treatments up to 650 °C. In our experiments, the catalytic activities of HTMS $SiO_{2}–Au$ were investigated by photometrically monitoring the reduction of p-nitrophenol (p-NPh) by an excess of $NaBH_{4}.$ It was found that the prepared HTMS $SiO_{2}–Au$ catalysts exhibited a high catalytic activity and this sample could be easily recycled without a decrease of the catalytic activities in the reaction.
ISSN	14779226
Issue Number	28
Journal	Dalton Trans.
Volume Number	43
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2014-07-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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