Oxygen states in oxides with a perovskite structure and their catalytic activity in complete oxidation reactions:: System La1-xCaxFeO3-y (x=0-1)

被引：19

作者：

Isupova, LA ^{[1
]}

Yakovleva, IS ^{[1
]}

Rogov, VA ^{[1
]}

Alikina, GM ^{[1
]}

Sadykov, VA ^{[1
]}

机构：

[1] Russian Acad Sci, Boreskov Inst Catalysis, Siberian Div, Novosibirsk 630090, Russia

来源：

KINETICS AND CATALYSIS | 2004年 / 45卷 / 03期

关键词：

D O I：

10.1023/B:KICA.0000032182.48410.e2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Oxygen states in the La1-xCaxFeO3-y perovskites prepared using different procedures are studied by temperature-programmed reduction (TPR). Results are compared to data on the catalytic activity in the oxidation of methane and carbon monoxide. The activity of the samples in the CO and CH4 oxidation over a wide temperature range (200-600degreesC) is shown to correlate with the amount of reactive surface and subsurface oxygen removable during TPR below 420degreesC. These oxygen states in the samples of the La1-xCaxFeO3-y series can be associated with the domain or intergrain boundaries. No correlation is found between the amount of lattice oxygen removable during TPR and the activity of the La1-xCaxFeO3-y samples in the complete oxidation of methane at temperatures of 450-600degreesC. It is suggested that catalytic complete oxidation is determined by the most reactive surface and subsurface oxygen states located at the interphase boundaries, whereas the lattice oxygen does not participate in these reactions.

引用

页码：446 / 453

页数：8

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