NDLI: Effect of hydrothermal reaction time and calcination temperature on properties of Au@CeO$_{2}$ core–shell catalyst for CO oxidation at low temperature

Content Provider	Springer Nature Link
Author	He, Beibei Zhao, Qingguo Zeng, Zhigang Wang, Xiaohong Han, Sheng
Copyright Year	2015
Abstract	Au@CeO$_{2}$ core–shell nanostructure catalysts were synthesized by hydrothermal reaction method. The effect of hydrothermal reaction time and calcination temperature on the textural and morphological characteristics of the catalyst was investigated by TEM, SEM, XRD, XPS, ICP, UV–Vis, and N$_{2}$ adsorption–desorption techniques. The results proved that gold core and CeO$_{2}$ shell formed simultaneously at the beginning of the reaction. By extending the hydrothermal reaction time, both the grain size of Au core and CeO$_{2}$ shell increased. The crystallization degree of CeO$_{2}$ and the interaction between Au and CeO$_{2}$ were also enhanced. The 90 % CO conversion temperature (T$_{90 %}$) of Au@CeO$_{2}$ declined from 187 to 142 °C with the hydrothermal reaction time extended from 6 to 20 h. After 70-h reaction, the catalytic activity was still maintained without any loss. The effect of the calcination temperature on the catalytic performance was also investigated and it turned out that high calcination temperature has a positive influence on the catalytic activity. The likely active sites are the interface between Au core and CeO$_{2}$ shell. Gold content, metal–support interaction (MSI), and oxygen vacancy are all related to the activity. The excellent performance of 20 h-600 °C-Au@CeO$_{2}$ in catalytic activity and stability results from the joint effects of these triple factors.
Starting Page	6339
Ending Page	6348
Page Count	10
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	50
Issue Number	19
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2015-06-27
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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