کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10243952 | 47193 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The activation of acetylene by Cu+ ions in zeolites studied by IR spectroscopy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The activation of acetylene by Cu+ ions in zeolites studied by IR spectroscopy The activation of acetylene by Cu+ ions in zeolites studied by IR spectroscopy](/preview/png/10243952.png)
چکیده انگلیسی
The interaction of acetylene with Cu+ ions in zeolites CuX, CuY, CuZSM-5 and CuMCM-41 was studied by IR spectroscopy. The CC bond was strongly activated, what resulted in a distinct weakening of the triple bond and of CH bond (ÎνCC = 156-168 cmâ1, ÎνCH = 93-122 cmâ1). The ability of Cu+ ions to activate acetylene molecule increases in the order: CuMCM-41 < CuZSM-5 < CuY < CuX. It may be related to increasing amount of AlO4â tetrahedra, and to increasing negative charge of zeolite framework. IR experiments evidenced, that Cu+ in various cationic sites activate acetylene molecule in a different extend. It has been shown, that Cu+ ions are also able to bond two acetylene molecules. The molecules of pyridine when bonded to Cu+ ions increase the electron donor properties of Cu+ ions and their ability to activate acetylene molecule. This effect is however very small. The adsorption of acetylene removes pre-adsorbed CO.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 101, Issue 2, 30 March 2005, Pages 123-129
Journal: Catalysis Today - Volume 101, Issue 2, 30 March 2005, Pages 123-129
نویسندگان
Jerzy Datka, Ewa Kukulska-ZajÄ
c, Weronika Kobyzewa,