Complete Combustion of Methane over Indium Tin Oxides Catalysts

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• 作者：Junhua Li ; Huijing Fu ; Lixin Fu ; Jiming Hao
• 刊名：Environmental Science & Technology
• 出版年：2006
• 出版时间：October 15, 2006
• 年：2006
• 卷：40
• 期：20
• 页码：6455 - 6459
• 全文大小：148K
• 年卷期：v.40,no.20(October 15, 2006)
• ISSN：1520-5851

文摘

Indium tin oxide (ITO) catalysts with different In/Sn ratioshave been prepared by the co-precipitation method.The catalysts were evaluated for methane combustion atdifferent temperatures (673-873 K) with a space velocity of30 000 h^-1. The results showed that methane could becompletely oxidized at 873 K with ITO catalysts. Doping anappropriate amount of tin into In₂O₃ could greatly improveits activity, while the performances of Indium-doped tinoxides were worse than that of SnO₂. A significantimprovement of the activity was obtained on the catalystIn8Sn2, which contains 80 wt. % of indium oxide and 20 wt.% of tin oxide. Crystal defection and the amount ofoxygen vacancy caused by doping were the main factorsthat would affect catalytic activity of ITO catalysts. Thecatalytic activity is strongly inhibited by the presence of alarge amount of water vapor at the entire temperaturerange, while only the activity at low temperature (under823 K) decreased in the presence of sulfur dioxide. By dopingSn into In₂O₃, its tolerance to SO₂ could be enhanceddue to the higher resistance of SnO₂.