Abstract
Herein, the effects of crystalline phase structures of rare earth oxides on active oxygen and basic sites were investigated. The fluorite structure shows the best lattice oxygen mobility and redox properties due to its open structure and weakest Ln-O bond strength. For Pr6O11 and Tb4O7, the presence of polyvalent cation states further enhances these properties. Based on the basicity and number of basic sites, the surfaces of A-type, B-type, and C-type lanthanide sesquioxides facilitate the generation of chemisorbed oxygen species in the following order: A-type >B-type >C-type. Furthermore, the basicity and amount of chemisorbed oxygen species are dependent on the electronegativity of rare earth elements, which decreases gradually from La to Lu. In rare earth oxides, electrons are less biased toward oxygen, the basicity of lattice oxygen decreases, and fewer electrons are produced for gaseous oxygen activation and chemisorbed oxygen generation.
Published Version
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