Abstract
The existence of the LnIIIFeIII0.5SbV1.5O6 (Ln = La-Sm) series has been established for the first time. These compounds were prepared using the co-precipitation method with subsequent annealing. The systematic investigation, which includes phase equilibria study of the Ce2Ox–Fe2O3–Sb2Oy system, XRD, XANES, Rietveld refinement method and magnetic measurements has been carried out. It was shown that these ternary oxides are realized in PbSb2O6 structure type (sp. g. P-31 m) and contain RE and Fe ions in +3 oxidation state. The comparative study of the morphology showed that the composition of the compounds do not affect the shape of the obtained quasi-spherical particles while the size decreases from 400 up to 100 nm in LaSm series. These antimonates exhibit high activity and stability in CO oxidation. The best result was obtained for LaFe0.5Sb1.5O6 catalyst. The temperature of 90% CO conversion increases from 272 up to 426 °C in the series La > Ce > Pr > Nd > Sm.
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