TY - JOUR
T1 - Structure and oxygen storage capacity of Pr/Nd doped CeO2-ZrO2 mixed oxides
AU - Wu, Xiaodi
AU - Wu, Xiaodong
AU - Liang, Qing
AU - Fan, Jun
AU - Weng, Duan
AU - Xie, Zhi
AU - Wei, Shiqiang
PY - 2007/7
Y1 - 2007/7
N2 - Binary Ce-Zr (CZ), trinary Ce-Zr-Pr (CZP), Ce-Zr-Nd (CZN) mixed oxides were prepared by coprecipitation. The structural and textural properties were characterized by the X-ray diffraction (XRD) analysis, Brunauer-Emmett-Teller (BET) method, Raman and X-ray absorption near-edge spectra (XANES) techniques, while the oxygen storage capacity (OSC) was evaluated under both dynamic and static conditions at 500 °C. The doping of Pr or Nd cations causes the lattice deformation of the tetragonal Zr-rich mixed oxides to form a pseudocubic structure and prevents the phase demixing after calcination in flowing steam/air at 1050 °C for 5 h. After the hydrothermal ageing treatment, the doped samples show higher BET surface areas and better oxygen mobility. Pr exists mainly in the form of trivalent cations in the aged CZP and functions primarily as the doping element with large ionic radius instead of redox couple Pr3+/Pr4+, which may introduce more Ce3+ species and hereby more lattice defects. Among the aged samples, CZP shows the best oxygen storage capacity and the fastest oxygen release rate. © 2007 Elsevier Masson SAS. All rights reserved.
AB - Binary Ce-Zr (CZ), trinary Ce-Zr-Pr (CZP), Ce-Zr-Nd (CZN) mixed oxides were prepared by coprecipitation. The structural and textural properties were characterized by the X-ray diffraction (XRD) analysis, Brunauer-Emmett-Teller (BET) method, Raman and X-ray absorption near-edge spectra (XANES) techniques, while the oxygen storage capacity (OSC) was evaluated under both dynamic and static conditions at 500 °C. The doping of Pr or Nd cations causes the lattice deformation of the tetragonal Zr-rich mixed oxides to form a pseudocubic structure and prevents the phase demixing after calcination in flowing steam/air at 1050 °C for 5 h. After the hydrothermal ageing treatment, the doped samples show higher BET surface areas and better oxygen mobility. Pr exists mainly in the form of trivalent cations in the aged CZP and functions primarily as the doping element with large ionic radius instead of redox couple Pr3+/Pr4+, which may introduce more Ce3+ species and hereby more lattice defects. Among the aged samples, CZP shows the best oxygen storage capacity and the fastest oxygen release rate. © 2007 Elsevier Masson SAS. All rights reserved.
KW - CeO2-ZrO2
KW - Neodymia
KW - OSC
KW - Praseodymia
KW - Pseudocubic
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U2 - 10.1016/j.solidstatesciences.2007.04.016
DO - 10.1016/j.solidstatesciences.2007.04.016
M3 - RGC 21 - Publication in refereed journal
SN - 1293-2558
VL - 9
SP - 636
EP - 643
JO - Solid State Sciences
JF - Solid State Sciences
IS - 7
ER -