Abstract

X-ray photoelectron spectroscopy has been applied to examine the surface electronic structure of layered oxides CeFe_0.5Sb_1.5O₆ and PrFe_0.5Sb_1.5O₆ 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.

中文翻译：

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X射线光电子能谱法研究新型催化剂CeFe 0.5 Sb 1.5 O 6和PrFe 0.5 Sb 1.5 O 6的CO氧化机理。

摘要

X射线光电子能谱法已应用于检查层状氧化物的cefE的表面电子结构_0.5的Sb _1.5 ø ₆和PrFe _0.5的Sb _1.5 ø ₆与PBSB ₂ ö ₆结构（属克P- 31米）。两种化合物的XP光谱分析表明，在催化测试前后，仅Ce ³⁺和Pr ³⁺氧化态。观察到的Sb ⁵⁺ / Sb ³⁺和Fe ³⁺ / Fe ^2+的变化催化后的比例可以指出，这些催化剂上的CO氧化是通过氧化还原转化Sb ³⁺ ↔Sb ⁵⁺和Fe ³⁺ ↔Fe ^2+进行的，直接涉及晶格氧和阴离子空位。