A melamine-assisted pyrolytic synthesis of Ag-CeO2 nanoassemblys for CO oxidation: Activation of Ag-CeO2 interfacial lattice oxygen

• Published in: Applied surface science Vol. 571; p. 151283
• Main Authors: Rao, Richuan, Liang, Hanwen, Hu, Chunming, Dong, Huaze, Dong, Xiongzi, Tang, Yongqiang, Fang, Song, Ling, Qiang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-01-2022
• Subjects: Ag-CeO2 nanoassemblys; CO oxidation; Lattice oxygen activation; Surface reconstruction; Surface reconstruction; Lattice oxygen activation; CO oxidation; Ag-CeO2 nanoassemblys
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2021.151283

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•Ag-CeO2 nanoassemblys are prepared by a melamine-induced pyrolytic method.•Pyrolysis temperature tunes partial or full activation of Ag-CeO2 interface oxygen.•Catalysts with properly activated interface oxygen have higher catalytic activity.
Ag-CeO2 nanoassemblys are prepared with a simple melamine-induced thermal decomposition method. Ag-CeO2 nanoassemblys have a structure composed of Ag nanoparticles and CeO2 nanoparticles. For Ag-CeO2 nanoassemblys, Ag introduction can partially or completely activate lattice oxygen species of CeO2 nanoparticles and however, the ease of Ag-CeO2 interface oxygen activation is strongly influenced by their pyrolysis temperature. Ag-CeO2 nanoassemblys prepared at 350 °C have only partial activation of CeO2 surface oxygen. If the calcination temperature increases to 400 °C, Ag-CeO2 nanoassemblys are fully activated to form more reducible interfacial lattice oxygen and to promote their low-temperature reductivity. Although excessive calcination temperature (500 °C) induces full activation of Ag-CeO2 interface lattice oxygen, Ag-CeO2 nanoassemblys will construct a new Ag-CeO2 interface that is relative difficult to reduce, causing a less amount of reducible interface lattice oxygen provided at higher temperature. Ag-CeO2 nanoassemblys are investigated to reveal the relationship of Ag-CeO2 interfacial oxygen activation and CO catalytic oxidation performance. Ag-CeO2 nanoassemblys with more interfacial lattice oxygen provided at lower temperature are found to have higher catalytic activity than that catalyst with the partially or excessively activated interfacial oxygen.