Catalytic Combustion of Methane over Rare Earth Stannate Pyrochlore

被引：7
|
作者：
Sarohan Park
Hae Jin Hwang
Jooho Moon
机构：
[1] Yonsei University,Department of Ceramic Engineering
[2] Korea Institute of Science and Technology,Advanced Materials Division
来源：
Catalysis Letters | 2003年 / 87卷
关键词：
catalytic combustion; methane; pyrochlore;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Well-defined Ln2Sn2O7 powders (Ln = La, Sm and Gd) with a phase-pure pyrochlore structure were synthesized by hydrothermal reaction. The catalytic activities of Ln2Sn2O7 powders for methane combustion were measured. Methane oxidation started at 500 °C and increased with oxidation temperature. Catalytic methane combustion is strongly influenced by the presence of oxygen vacancies that form by breaking Sn–O lattice bonds as the temperature increases. Addition of manganese to the rare earth pyrochlores improved methane oxidation activity. Manganese-doped samarium stannate pyrochlore (Sm2Sn1.8Mn0.2O7) shows highest the catalytic activity. Light-off and complete oxidation temperatures were measured at about 400 and 650 °C, respectively.
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页码：219 / 223
页数：4
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