Lattice defects and oxygen storage capacity of nanocrystalline ceria and ceria-zirconia

Article Abstract:

The atomic structures of nanorystalline powders of ceria, CEO2 and cera-zirconia solid solution are examined by the pulsed neutron diffraction technique. The conclusion suggests that oxygen defects are the source of OSC in ceria-based catalyst supports and the preservation of oxygen defects is critical for the stability of OSC against thermal aging.

Neutron diffraction, Optical properties

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Electronic and atomistic structures of clean and reduced ceria surfaces

Article Abstract:

The atomistic and electronic structures of oxygen vacancies on the (111) and (110) surface of ceria are studied by means of periodic density functional calculations. The calculated atomistic and electronic structures of the defect-free and reduced surfaces are shown to agree with spectroscopic and microscopic measurements.

Analysis, Density functionals, Density functional theory, Atomic properties

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Nanoscale heterogeneities and oxygen storage capacity of Ce0.5Zr0.5O2

Article Abstract:

Nanocrystalline powders of Ce0.5Zr0.5O2 are synthesized and characterized for the application as a catalyst support and oxygen storage medium in automotive catalysts. The oxygen storage capacity does not show a correlation with either crystallite size or surface area of the samples.

Spectra, Zirconium

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