(Ln1.8Fe0.2)FeSbO7 (Ln = Pr–Tb) Mixed Oxides with the Pyrochlore Structure in CO Oxidation Reaction


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Abstract

(Ln1.8Fe0.2)FeSbO7 (Ln = Pr–Tb) mixed oxides have been synthesized via coprecipitation followed by annealing. According to Rietveld refinement results, all of the oxides have the pyrochlore structure (sp. gr. Fd\(\bar {3}\)mz). The (Ln1.8Fe0.2)FeSbO7 compounds have been shown to exhibit high activity for CO oxidation reaction. The best results have been obtained for (Pr1.8Fe0.2)FeSbO7, which has a 90% CO conversion temperature T90 = 385°C. With increasing lanthanide atomic number, T90 rises monotonically from 385 to 550°C in going from Pr to Tb. This behavior is most likely due to the decrease of structural imperfection in the compounds with smaller lanthanide ionic radii.

About the authors

O. G. Ellert

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Author for correspondence.
Email: oellert@yandex.ru
Russian Federation, Leninskii pr. 31, Moscow, 119991

A. V. Egorysheva

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: oellert@yandex.ru
Russian Federation, Leninskii pr. 31, Moscow, 119991

E. Yu. Liberman

Mendeleev University of Chemical Technology

Email: oellert@yandex.ru
Russian Federation, Miusskaya pl. 9, Moscow, 125047

S. V. Golodukhina

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: oellert@yandex.ru
Russian Federation, Leninskii pr. 31, Moscow, 119991

D. I. Kirdyankin

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: oellert@yandex.ru
Russian Federation, Leninskii pr. 31, Moscow, 119991

O. M. Gajtko

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: oellert@yandex.ru
Russian Federation, Leninskii pr. 31, Moscow, 119991

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