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

被引：9

作者：

Ellert, O. G. ^{[1
]}

Egorysheva, A. V. ^{[1
]}

Liberman, E. Yu. ^{[2
]}

Golodukhina, S. V. ^{[1
]}

Kirdyankin, D. I. ^{[1
]}

Gajtko, O. M. ^{[1
]}

机构：

[1] Russian Acad Sci, Kurnakov Inst Gen & Inorgan Chem, Leninskii Pr 31, Moscow 119991, Russia

[2] Mendeleev Univ Chem Technol, Miusskaya Pl 9, Moscow 125047, Russia

来源：

INORGANIC MATERIALS | 2019年 / 55卷 / 12期

基金：

俄罗斯基础研究基金会;

关键词：

pyrochlores; rare-earth oxides; CO oxidation reaction; structure; morphology; LOW-TEMPERATURE OXIDATION; CARBON-MONOXIDE; DIELECTRIC-PROPERTIES; CATALYTIC-OXIDATION; METHANE COMBUSTION; CRYSTAL-CHEMISTRY; SYSTEM; PHASE; LA; MOSSBAUER;

D O I：

10.1134/S0020168519120033

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

(Ln(1.8)Fe(0.2))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. ). The (Ln(1.8)Fe(0.2))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 T-90 = 385 degrees C. With increasing lanthanide atomic number, T-90 rises monotonically from 385 to 550 degrees 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.

引用

页码：1257 / 1263

页数：7

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