کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9700908 | 1462132 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Complementary phenomenological and spectroscopic studies of propane sensing with tin dioxide based sensors
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Sensing of propane with SnO2-based thick film gas sensors was studied by using a combination of experimental techniques. In order to assign reaction pathways, direct IR surface spectroscopic measurements (DRIFT) were performed. For a better understanding of the full picture, the spectroscopic information was completed with catalytic conversion and electrical measurements. We observed that during propane interaction with SnO2 the surface ionic species play a crucial role. The results indicate that: the C3H8 dehydrogenation is initiated by hydrogen abstraction over a surface acid-base lattice pair site (Sn4+O2â) while its further transformation is caused by reaction with adsorbed oxygen ions and with surface hydroxyl groups. In parallel with the rupture of the CH and/or CC bond, the ionic carboxylate species are formed and through further oxidative dehydrogenation, forms CO2â and CO32â surface species. The carbonates and carboxylates are finally desorbed as CO2(g).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 108, Issues 1â2, 22 July 2005, Pages 75-83
Journal: Sensors and Actuators B: Chemical - Volume 108, Issues 1â2, 22 July 2005, Pages 75-83
نویسندگان
Dorota Koziej, Nicolae Bârsan, Volker Hoffmann, Jacek Szuber, Udo Weimar,