标题：Contributions of distinct gold species to catalytic reactivity for carbon monoxide oxidation
作者：Guo, Li-Wen; Du, Pei-Pei; Fu, Xin-Pu; Ma, Chao; Zeng, Jie; Si, Rui; Huang, Yu-Ying; Jia, Chun-Jiang; Zhang, Ya-Wen; Yan, Chun-Hua
作者机构：[Guo, Li-Wen; Fu, Xin-Pu; Jia, Chun-Jiang] Shandong Univ, Sch Chem & Chem Engn, Key Lab Special Aggregated Mat, Key Lab Colloid & Interface Chem, Jina 更多
通讯作者：Si, R;Ma, C
通讯作者地址：[Si, R]Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China;[Ma, C]Univ Sci & Technol China, 更多
摘要：Small-size (<5 nm) gold nanostructures supported on reducible metal oxides have been widely investigated because of the unique catalytic properties they exhibit in diverse redox reactions. However, arguments about the nature of the gold active site have continued for two decades, due to the lack of comparable catalyst systems with specific gold species, as well as the scarcity of direct experimental evidence for the reaction mechanism under realistic working conditions. Here we report the determination of the contribution of single atoms, clusters and particles to the oxidation of carbon monoxide at room temperature, by the aid of in situ X-ray absorption fine structure analysis and in situ diffuse reflectance infrared Fourier transform spectroscopy. We find that the metallic gold component in clusters or particles plays a much more critical role as the active site than the cationic single-atom gold species for the room-temperature carbon monoxide oxidation reaction.