کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10241729 | 46581 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reaction mechanism of NO decomposition over alkali metal-doped cobalt oxide catalysts
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The kinetics of NO decomposition were investigated over alkali metal-doped Co3O4 catalysts. For all the alkali metal-doped Co3O4 catalysts tested, the presence of O2 caused a decrease in the N2 formation rate with reaction orders between â0.26 and â0.40. The reaction orders with respect to NO were between 1.21 and 1.47, which are higher than unity, suggesting that NO decomposition proceeds via a bimolecular reaction. The observation by in situ Fourier transform infrared (FT-IR) spectroscopy confirmed the presence of nitrite (NO2â) species on the surface under NO decomposition conditions. Isotopic transient kinetic analysis performed using 14NO and 15NO revealed that a surface-adsorbed species, probably NO2â, serves as an intermediate during NO decomposition. We proposed a reaction mechanism in which the reaction is initiated by NO adsorption onto alkali metals to form NO2â species, which migrates to the interface between the alkali metals and Co3O4, the active sites, and then react with the adsorbed NO species to form N2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis B: Environmental - Volume 55, Issue 3, 10 February 2005, Pages 169-175
Journal: Applied Catalysis B: Environmental - Volume 55, Issue 3, 10 February 2005, Pages 169-175
نویسندگان
Masaaki Haneda, Yoshiaki Kintaichi, Hideaki Hamada,