Abstract
X-ray photoelectron spectroscopy has been applied to examine the surface electronic structure of layered oxides CeFe0.5Sb1.5O6 and PrFe0.5Sb1.5O6 with PbSb2O6 structure (sp. g. P‑31m). The analysis of the XP-spectra for both compounds revealed only Ce3+ and Pr3+oxidation state before and after catalytic tests. The observed variation of the Sb5+/Sb3+ and Fe3+/Fe2+ ratios after catalysis can point to that CO oxidation on these catalysts proceeds by virtue of redox transformations Sb3+ ↔ Sb5+ and Fe3+ ↔ Fe2+ with direct involvement of lattice oxygen and anionic vacancies.
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