کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
64597 48362 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Locating the active sites of metallocene catalysts supported on acid-treated montmorillonite
ترجمه فارسی عنوان
قرار دادن سایت های فعال کاتالیزورهای فلزین بر روی مونتموریلونیت تحت درمان با اسید حمایت می شود
کلمات کلیدی
کاتالیزور متالوژن، مونتموریلونیت، فعال کننده، حمایت کردن، سایت فعال
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی


• At MMT platelet border, acid sites were formed by H2SO4 treatment.
• XRD indicated that metallocene was not intercalated into acid-treated MMT.
• EFTEM showed that propylene was polymerized at the border.
• Metallocene was supported and activated at the border (not interlayer).

In this study, we investigated the location of the active sites of montmorillonite-supported metallocene catalysts used for propylene polymerization. X-ray fluorescence, Hammett titration, and scanning transmission electron microscopy/energy-dispersive X-ray spectroscopy revealed that the gradual leaching of Al atoms from the borders of the platelets to their centers and acid site formation occurred when montmorillonite was subjected to an acid treatment. X-ray diffraction and transmission electron microscopy analyses indicated that the metallocene complex was activated only on the borders of the acid-treated montmorillonite platelets. The most plausible explanation for this phenomenon is that the metallocene complex is activated by the acid sites formed on the borders of the platelets by the acid treatment of montmorillonite.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 420, August 2016, Pages 228–236
نویسندگان
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