Tungsten oxide reactivity versus CH4, CO and NO2 molecules studied by Raman spectroscopy

被引:61
作者
Boulova, M
Gaskov, A
Lucazeau, G
机构
[1] Inst Natl Polytech Grenoble, ENSEEG, CNRS,UMR 5631, Lab Electrochim & Physicochim Mat & Intefaces, F-38402 St Martin Dheres, France
[2] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119899, Russia
关键词
tungsten oxide; carbon molecules; nitrogen oxide; nanoparticles; Raman spectroscopy; reactivity;
D O I
10.1016/S0925-4005(01)00938-8
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Reactivity of different nanometric tungsten oxide was measured by in situ Raman spectroscopy coupled with electrical measurements during the reaction with CH4, CO and NO2 molecules in the temperature range of 50-250 degreesC. Sample with the smallest crystallite size (2 nm) exhibited a strong electrical and Raman response to the presence of these molecules. The formation of a very active form of carbon was observed already at 50 degreesC on the surface of tungsten oxide during the catalytic reactions involving gases containing carbonaceous molecules. Switching the atmosphere from reducing to NO2 oxidizing gas leads to a complete and immediate disappearance of the carbon and the conductivity changes by a factor of 10(5). No such changes were observed for crystallite sizes of 35 nm. The results are discussed and interpretation based on quasi-chemical reactions is proposed. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:99 / 106
页数:8
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