Tuning the metal-support interaction in the thermal-resistant Au–CeO2 catalysts for CO oxidation: influence of a mild N2 pretreatment. Issue 68 (23rd November 2018)

• Record Type: Journal Article
• Authors: Sun, Yuqi; Liu, Wei; Tian, Miao; Wang, Liguo; Wang, Zhongpeng
• Is Part Of: RSC advances. Volume 8:Issue 68(2018)
• Page Start: 39197
• Page End: 39202
• Publication Date: 2018-11-23
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c8ra07278g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The degree of encapsulation for Au–CeO2 catalysts was identical to the catalysts exhibiting metal-support interaction, which improved the CO oxidation activity. Abstract : Pretreatment is very important for altering the catalytic properties of the supported noble metal catalysts in many heterogeneous reactions. In this study, a simple and mild pretreatment with N2 has been reported to re-activate the Au–CeO2 catalysts that were prepared by a deposition–precipitation method followed by calcination at 600 °C. Upon N2 pretreatment at 200 °C, the metal-support interaction between Au nanoparticles (NPs) and CeO2 was observed with the evidence of particular coverage of Au nanoparticles by CeO2, electronic interactions and changes in CO adsorption ability. As a result, the CO oxidation activity of the pretreated Au–CeO2 catalysts largely improved compared with those without any pretreatment and even with those subjected to H2 and O2 pretreatments. N2 pretreatment also makes the Au NPs more resistant to sintering at high temperature. Furthermore, this mild pretreatment strategy can provide a potential approach to improve the thermal stability of other supported noble metal catalysts.