کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
56223 47078 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Do synthetic Fe-zeolites mimic biological Fe-porphyrins in reactions with nitric oxide?
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Do synthetic Fe-zeolites mimic biological Fe-porphyrins in reactions with nitric oxide?
چکیده انگلیسی

Iron containing ZSM-5 zeolites is extremely active in nitrous oxide decomposition. This reaction involves atomic oxygen species known as “alpha oxygen” on iron sites. Despite the multiple techniques devoted to its characterization, the active sites’ structure remains nevertheless unknown. Herein, these centers are quantified via surface titration by nitrous oxide followed by temperature programmed desorption and characterized via nitric oxide probe molecule followed by infrared spectroscopy. In this latter case, two mono-nitrosyl species differing in the bonds’ geometry are observed on the iron centers. Moreover, upon NO evacuation, the two corresponding IR bands suddenly transit to lower wavenumbers. A mirror trend is also reported in biology when NO interacts with iron porphyrins and explained in terms of linear to bent Fe–N–O modification. This structural change is reversible upon addition/evacuation of NO. In the present report, the same reversible nitrosyl transition is observed for Fe–ZSM-5. Based on the close analogies found, the active site's structure in Fe–ZSM-5 is built-up from the porphyrinatoiron(II) model.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 157, Issues 1–4, 17 November 2010, Pages 223–230
نویسندگان
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