1. A Rational Design of the Sintering-Resistant Au-CeO2 Nanoparticles Catalysts for CO Oxidation: The Influence of H2 Pretreatments.
- Author
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Sun, Yuqi, Liu, Wei, Tian, Miao, Wang, Liguo, and Wang, Zhongpeng
- Subjects
CATALYSTS ,NANOPARTICLES ,CHEMICAL inhibitors ,NANOSTRUCTURED materials ,OXIDATION - Abstract
The redox pretreatment of samples is one of the crucial ways of altering the catalytic properties of the supported noble metal materials in many heterogeneous reactions. Here, H
2 -reducing pretreatment is reported to enhance the thermal stability of Au-CeO2 catalysts prepared by the deposition–precipitation method and calcination at 600 °C for CO oxidation. In order to understand the improved activity and thermal stability, a series of techniques were used to characterize the physico-chemical changes of the catalyst samples. H2 pretreatment may lead to: (i) a strong metal–support interaction (SMSI) between Au nanoparticles (NPs) and CeO2 , evidenced by the particular coverage of Au NPs by CeO2 , electronic interactions and CO adsorption changes. (ii) the production of surface bicarbonates which can accelerate CO oxidation. As a result, the H2 pretreatment makes the Au NPs more resistant to sintering at high temperature and enhances the CO oxidation activity. Furthermore, this reduction pretreatment strategy may provide a potential approach to enhance the thermal-stability of other supported noble metal catalysts. [ABSTRACT FROM AUTHOR]- Published
- 2018
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