Effect of active oxygen on the performance of Pt/CeO2 catalysts for CO oxidation

查看全文 作　　者：Anbin [1]Zhou;Jun [1]Wang;Hui [1]Wang;Hang [1]Li;Jianqiang [1]Wang;Meiqing [1,2,3]Shen

机构地区：[1]Key Laboratory for Green Chemical Technology of State Education Ministry,School of Chemical Engineering&Technology,Tianjin University,Tianjin300350,China;[2]Collaborative Innovation Center of Chemical Science and Engineering(Tianjin),Tianjin 300350,China;[3]State Key Laboratory of Engines,Tianjin University,Tianjin 300350,China

出　　处：《Journal of Rare Earths》索引2018年第36卷第3期,共8页

基　　金：Project supported by the National key research and development program(2016YFC0204901);the National Natural Science Foundation of China(21576207);the Introduction Of Talent and Technology Cooperation Plan Of Tianjin(14RCGFGX00849);GM Global Research&Development(GAC 1539) 摘　　要：This study was focused on the influence of active oxygen on the performance of Pt/CeO_2 catalysts for CO oxidation. A series of CeO_2 supports with different contents of active oxygen were obtained by adding surfactant at different synthesis steps. 0.25 wt% Pt was loaded on these CeO_2 supports by incipientwetness impregnation methods. The catalysts were characterized by N2 adsorption, X-ray diffraction(XRD), high-resolution transmission electron microscopy(HRTEM), H_2 temperature-programmed reduction(H_2-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 CeO_2. After loading Pt, the more active oxygen on CeO_2 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 Pt^(δ+) species. Thus the activity is also influenced by the states of Pt and the Pt^(δ+) species may contribute to the high activity at elevated temperature. 关键词：部分氧化催化剂表演表面活化剂 CEO2 电子显微镜高分辨率存储能力

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Effect of active oxygen on the performance of Pt/CeO2 catalysts for CO oxidation

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