Effect of active oxygen on the performance of Pt/CeO2 catalysts for CO oxidation
来源期刊：JOURNAL OF RARE EARTHS2018年第3期
论文作者：Anbin Zhou Jun Wang Hui Wang Hang Li Jianqiang Wang Meiqing Shen
文章页码：257 - 264
摘 要：This study was focused on the influence of active oxygen on the performance of Pt/CeO2 catalysts for CO oxidation. A series of CeO2 supports with different contents of active oxygen were obtained by adding surfactant at different synthesis steps. 0.25 wt% Pt was loaded on these CeO2 supports by incipientwetness impregnation methods. The catalysts were characterized by N2 adsorption, X-ray diffraction（XRD）, high-resolution transmission electron microscopy（HRTEM）, H2 temperature-programmed reduction（H2-TPR）, dynamic oxygen storage capacity（DOSC） and in-situ DRIFTS technologies. For S-f supports, the surfactant was added into the solution before spray-drying in the synthesis process, which facilitates more active oxygen formation on the surface of CeO2. After loading Pt, the more active oxygen on CeO2 contributes to dispersing Pt species and enhancing the CO oxidation activity. As for the aged samples,Pt-R-h shows the highest activity above 190 ℃ because of the presence of more partly oxidized Ptδ+ species. Thus the activity is also influenced by the states of Pt and the Ptδ+ species may contribute to the high activity at elevated temperature.
Anbin Zhou1，Jun Wang1，Hui Wang1，Hang Li1，Jianqiang Wang1，Meiqing Shen1,2,3
1. Key Laboratory for Green Chemical Technology of State Education Ministry,School of Chemical Engineering & Technology,Tianjin University2. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)3. State Key Laboratory of Engines,Tianjin University
摘 要：This study was focused on the influence of active oxygen on the performance of Pt/CeO2 catalysts for CO oxidation. A series of CeO2 supports with different contents of active oxygen were obtained by adding surfactant at different synthesis steps. 0.25 wt% Pt was loaded on these CeO2 supports by incipientwetness impregnation methods. The catalysts were characterized by N2 adsorption, X-ray diffraction（XRD）, high-resolution transmission electron microscopy（HRTEM）, H2 temperature-programmed reduction（H2-TPR）, dynamic oxygen storage capacity（DOSC） and in-situ DRIFTS technologies. For S-f supports, the surfactant was added into the solution before spray-drying in the synthesis process, which facilitates more active oxygen formation on the surface of CeO2. After loading Pt, the more active oxygen on CeO2 contributes to dispersing Pt species and enhancing the CO oxidation activity. As for the aged samples,Pt-R-h shows the highest activity above 190 ℃ because of the presence of more partly oxidized Ptδ+ species. Thus the activity is also influenced by the states of Pt and the Ptδ+ species may contribute to the high activity at elevated temperature.
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