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A Rational Design of the Sintering-Resistant Au-CeO2 Nanoparticles Catalysts for CO Oxidation: The Influence of H2 Pretreatments

School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China
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Materials 2018, 11(10), 1952; https://doi.org/10.3390/ma11101952
Received: 30 August 2018 / Revised: 27 September 2018 / Accepted: 2 October 2018 / Published: 12 October 2018
(This article belongs to the Special Issue Supported Materials for Catalytic Application)
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, H2-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. View Full-Text
Keywords: H2 pretreatment; Au-CeO2 catalysts; CO oxidation; strong metal–support interaction; thermal-resistant H2 pretreatment; Au-CeO2 catalysts; CO oxidation; strong metal–support interaction; thermal-resistant
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MDPI and ACS Style

Sun, Y.; Liu, W.; Tian, M.; Wang, L.; Wang, Z. A Rational Design of the Sintering-Resistant Au-CeO2 Nanoparticles Catalysts for CO Oxidation: The Influence of H2 Pretreatments. Materials 2018, 11, 1952.

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