标题：Nanoceria Supported Gold Catalysts for CO Oxidation
作者：Jin, Zhao; Song, Yang-Yang; Fu, Xin-Pu; Song, Qi-Sheng; Jia, Chun-Jiang
作者机构：[Jin, Zhao; Song, Yang-Yang; Fu, Xin-Pu; Song, Qi-Sheng; Jia, Chun-Jiang] Shandong Univ, Sch Chem & Chem Engn, Key Lab Colloid & Interface Chem, Key L 更多
通讯作者地址：[Jia, CJ]Shandong Univ, Sch Chem & Chem Engn, Key Lab Colloid & Interface Chem, Key Lab Special Aggregated Mat, Jinan 250100, Shandong, Peoples R Chin 更多
来源：CHINESE JOURNAL OF CHEMISTRY
关键词：gold catalysts; nanoceria; CO oxidation; active species
摘要：Two types of CeO2 nanocubes (average size of 5 and 20 nm, respectively) prepared via the hydrothermal process were selected to load gold species via a deposition-precipitation (DP) method. Various measurements, including X-ray diffraction (XRD), Raman spectra, high resolution transmission electron microscopy (HRTEM), in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS), and temperature-programmed reduction by hydrogen (H-2-TPR), were applied to characterize the catalysts. It is found that the sample with ceria size of 20 nm (Au/CeO2-20) was covered by well dispersed both Au3+ and Au+ (0 < < 1). For the other sample with ceria size of 5 nm (Au/CeO2-5), Au3+ is the dominant gold species. Au/CeO2-20 performed better catalytic activity for CO oxidation because of the strong CO adsorption of Au+ in the catalysts. The catalytic activity of Au/CeO2-5 was improved due to the transformation of Au3+ to Au+. Based on the CO oxidation and in situ DRIFTS results, Au+ is likely to play a more important role in catalyzing CO oxidation reaction.