Structure and oxygen storage capacity of Pr-doped Ce0.26Zr0.74O2 mixed oxides
作者： Rui RAN , Duan WENG , Xiaodong WU , Jun FAN , Lei WANG
DOI: 10.1016/S1002-0721(10)60597-2
关键词: Praseodymium 、 Inorganic chemistry 、 Redox 、 Materials science 、 Temperature-programmed reduction 、 Oxygen 、 Catalysis 、 Doping 、 X-ray photoelectron spectroscopy 、 Raman spectroscopy
摘要: Abstract Binary Ce-Zr (CZ), Pr-Zr (PZ) and ternary Ce-Zr-Pr (CZP) mixed oxides were prepared by an ammonia-aided co-precipitation method, aged in a steam/air flow at 1050 °C. X-ray diffraction (XRD), Raman spectra, X-photon spectra (XPS) CO temperature programmed reduction (TPR) carried out to characterize the micro-structure reducibility of catalysts. The oxygen storage capacity (OSC) was evaluated with serving as probe gas. results showed that pseudo cubic structure formed for Zr-rich ceria-zirconia Pr doping. insertion prevented phase segregation during hydrothermal ageing. doped samples better redox performances comparison CZ, sample 5 wt.% most remarkably promoted dynamic capacity. This phenomenon closely related both mobility oxides. introduction praseodymium into could accelerate migration increasing amount vacancies, although it difficult 3+ ions themselves participate exchange process.
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