کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9610178 | 47163 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Catalytic abatement of NOx: Chemical and mechanistic aspects
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Catalytic abatement of NOx: Chemical and mechanistic aspects Catalytic abatement of NOx: Chemical and mechanistic aspects](/preview/png/9610178.png)
چکیده انگلیسی
The chemical and mechanistic aspects of the selective catalytic reduction (SCR) of NO by ammonia and by methane have been investigated. In the classical NH3-SCR process, operating near 600Â K over vanadia-titania based catalysts, ammonia is activated by coordination over Lewis acid sites and reacts with gas phase or weakly adsorbed NO. The same mechanism occurs for the low-temperature (400-500Â K) NH3-SCR over Mn and Fe based catalysts. On the contrary, low-temperature NH3-SCR over protonic zeolites implies the activation of ammonia as ammonium ions and the previous oxidation of part of NO to NO2. The CH4-SCR over Co-zeolite catalysts is supposed to imply the activation of NOx in the form of an adsorbed oxidized species, that reacts with the reductant, CH4, from the gas phase or activated by adsorption into the zeolite channels. The other catalytic denoxing technologies, like the NO decomposition over Cu-zeolite based catalysts, the N2O decomposition over noble or transition metal based catalysts, the storage-reduction on Ba-aluminate based catalysts and the reduction by CO over noble metal based three way catalysts, imply a strong adsorption and activation of NOx over the surface, although activation of hydrocarbons and CO over the noble metals can also be helpful in the last two cases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volumes 107â108, 30 October 2005, Pages 139-148
Journal: Catalysis Today - Volumes 107â108, 30 October 2005, Pages 139-148
نویسندگان
Guido Busca, Maria Angeles Larrubia, Laura Arrighi, Gianguido Ramis,