Ceria-based catalysts lattice oxygen

The defective structure in nanocrystalline ceria based catalysts proved to have strong effect on the OSC. Mamontov et al. (2000) reported the neutron diffraction studies of the atomic structures of nanocrystalline powder of ceria and ceria-zirconia solid solution. They found that the concentration of vacancy-interstitial oxygen defects has a direct correlation with the OSC. This effect is stronger than the correlation of surface area with OSC. Zirconia reduces ceria and preserves oxygen defects to retard the degradation of ceria-zirconia in OSC. Yan et al. observed the strong correlation between OSC and the lattice strain in nanosized ceria-zirconia, which could be measured via XRD (Si et al., 2004 Figure 11). 

Ceria-based iron oxide catalysts can form solid solutions (Cei Fex02) and were found to perform better than ceria-based Zr, Ti, Pr, and Y mixed oxides [117]. In order to stabihze the lattice structure of Ce02 and the oxygen diffusion capacity, the Cei xFex02 catalyst was prepared via the hydrothermal method and a highly dispersed Fe203 on the surface of the Cei solid solution was obtained... 

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