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EnglishBy X-ray diffraction on polycrystalline powders and Fourier-transform IR spectroscopy, some adducts MgCl2(C2H5OH)x were studied, having different composition in the range from x = 0 (α-MgCl2) to x = 6. For 2 < x ≤ 6, the structure of such adducts shows prevalently ionic Mg-Cl bonds. For x ≤ 2, covalent bonds are observed among chlorine and magnesium atoms, which give rise to chain compounds through chlorine bridges among the Mg-atoms. The obtained structural data are also discussed in terms of the synthesis of some MgCl2-based supports which are very active in the Ziegler-Natta process of olefin polymerization, after a treatment with titanium halides and a successive addition of a cocatalyst and of other suitable donors.
| Titolo: | MgCl2-supported Ziegler-Natta catalysts: a structural investigation by X-ray diffraction and Fourier-transform IR spectroscopy on the chemical activation process through MgCl2-ethanol adducts | |
| Autori: | ||
| Data di pubblicazione: | 1992 | |
| Rivista: | ||
| Abstract: | By X-ray diffraction on polycrystalline powders and Fourier-transform IR spectroscopy, some adducts MgCl2(C2H5OH)x were studied, having different composition in the range from x = 0 (α-MgCl2) to x = 6. For 2 < x ≤ 6, the structure of such adducts shows prevalently ionic Mg-Cl bonds. For x ≤ 2, covalent bonds are observed among chlorine and magnesium atoms, which give rise to chain compounds through chlorine bridges among the Mg-atoms. The obtained structural data are also discussed in terms of the synthesis of some MgCl2-based supports which are very active in the Ziegler-Natta process of olefin polymerization, after a treatment with titanium halides and a successive addition of a cocatalyst and of other suitable donors. | |
| Handle: | http://hdl.handle.net/11577/123876 | |
| Appare nelle tipologie: | 01.01 - Articolo in rivista |
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