Catalytic impact of RuOx clusters to high NH3 sensitivity of tin dioxideстатья
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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.
Авторы:
Marikutsa A. ,
Krivetskiy V. ,
Rumyantseva M. ,
Konstantinova E. ,
Ponzoni A. ,
Comini E. ,
Gaskov A.
Журнал:
Procedia Engineering
Том:
25
Год издания:
2011
Первая страница:
227
Последняя страница:
230
DOI:
10.1016/j.proeng.2011.12.056
Аннотация:
A comparative study of NH 3-sensing properties of blank and modified nanocrystalline SnO 2 was performed. Tin dioxide modified by ruthenium displayed outstanding ammonia sensitivity with a maximum signal at 200°C. The modifier was shown by XPS to possess mixed valence states of oxidized ruthenium. The RuO x-modified material was shown by EPR to contain up to 14 at. % of Ru 3+ distributed between the surface and the bulk of SnO 2 crystallites. From EPR study of SnO 2/RuO x interaction with NH 3/air mixture Ru 3+ to Ru 4+ oxidation was deduced. This could be due to oxidative products of NH 3 conversion, that was supported by the oxidative-like gas response during sensing tests using the NH 3/air gas flow passed through a preconcentrator with RuO x-modified tin dioxide heated to 200°C. © 2011 Published by Elsevier Ltd.
Добавил в систему:
Кривецкий Валерий Владимирович