Complete combustion of methane over indium tin oxides catalysts.
Complete combustion of methane over indium tin oxides catalysts.
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DOI：
10.1021/es061629q
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发表时间：
2006-09
影响因子：
11.4
通讯作者：
Junhua Li;H. Fu;L. Fu;J. Hao
中科院分区：
文献类型：
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作者：
Junhua Li;H. Fu;L. Fu;J. Hao
采用共沉淀法制备了不同In/Sn比的氧化铟锡（ITO）催化剂。在不同温度（673-873 K）和空速（30 000 h-1）下对催化剂进行了甲烷燃烧性能评价。结果表明，在873 K下，甲烷在ITO催化剂上可被完全氧化.在In_2O_3中掺入适量的锡可以大大提高其活性，但掺铟氧化锡的性能不如SnO_2。在催化剂In_8 Sn_2中加入80 wt. %的氧化铟和20 wt. %的氧化锡。掺杂引起的晶体缺陷和氧空位量是影响ITO催化剂催化活性的主要因素。在整个温度范围内，大量水蒸气的存在强烈抑制了催化剂的活性，而二氧化硫的存在仅降低了低温（823 K以下）的催化活性。通过在In 2 O3中掺杂Sn，由于SnO 2的高电阻，可以提高其对SO2的耐受性。
Indium tin oxide (ITO) catalysts with different In/Sn ratios have been prepared by the co-precipitation method. The catalysts were evaluated for methane combustion at different temperatures (673-873 K) with a space velocity of 30 000 h(-1). The results showed that methane could be completely oxidized at 873 K with ITO catalysts. Doping an appropriate amount of tin into In2O3 could greatly improve its activity, while the performances of Indium-doped tin oxides were worse than that of SnO2. A significant improvement of the activity was obtained on the catalyst In8Sn2, which contains 80 wt. % of indium oxide and 20 wt. % of tin oxide. Crystal defection and the amount of oxygen vacancy caused by doping were the main factors that would affect catalytic activity of ITO catalysts. The catalytic activity is strongly inhibited by the presence of a large amount of water vapor at the entire temperature range, while only the activity at low temperature (under 823 K) decreased in the presence of sulfur dioxide. By doping Sn into In2O3, its tolerance to SO2 could be enhanced due to the higher resistance of SnO2.