کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5420825 | 1395473 | 2009 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
17O DOR and other solid-state NMR studies concerning the basic properties of zeolites LSX
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
We demonstrate complementary 1H, 17O, 27Al and 29Si measurements for basic low-silica-X zeolites, which were unloaded and pyrrole and formic acid-loaded. It was found that the acid-base-system is not stabile, if the loading exceeds one pyrrole molecule or two formic acid molecules per supercage.17O DOR NMR spectra exhibit at least four lines, which are broadened by a distribution of chemical shifts in a similar extend as the 29Si MAS NMR spectra are broadened by distribution of Si-O-Al angles. A strong cation influence upon 17O shifts was observed. But there was no strong influence of the acid molecules on the mean value of the 17O shift of the spectra.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Nuclear Magnetic Resonance - Volume 35, Issue 2, April 2009, Pages 87-92
Journal: Solid State Nuclear Magnetic Resonance - Volume 35, Issue 2, April 2009, Pages 87-92
نویسندگان
Denis Schneider, Helge Toufar, Ago Samoson, Dieter Freude,