کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9617647 | 49176 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Magnetic interaction between copper (II) ion and paramagnetic NO and O2 molecules in Y-type zeolite at low temperature: An EPR study
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Electron paramagnetic resonance (EPR) spectra of partially copper ion exchanged Na-Y zeolite (CuNa-FAU) were measured in the presence of paramagnetic gases such as nitrogen monoxide (NO) and oxygen (O2) as a function of temperature (110-270Â K). The EPR signal intensities of the Cu2+ ions deviated from those predicted by Curie's paramagnetic law due to the magnetic interaction between the Cu2+ ions and paramagnetic gaseous molecules adsorbed on the zeolites; the minimum signal intensity was observed at 150-170Â K for CuNa-FAU with NO and the maximum intensity was observed at 170-190Â K for CuNa-FAU with O2. The temperature dependent signal intensities, accompanying the NO adsorption, were discussed in terms of the Langmuir adsorption model in the higher temperature range of 150-190Â K.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 83, Issues 1â3, 1 September 2005, Pages 165-171
Journal: Microporous and Mesoporous Materials - Volume 83, Issues 1â3, 1 September 2005, Pages 165-171
نویسندگان
Hidenori Yahiro, Yasuo Ohmori, Masaru Shiotani,