Activation effect of alkoxysilanes as external donors in magnesium chloride-supported Ziegler-Natta catalysts

1992 ◽  
Vol 25 (22) ◽  
pp. 5914-5918 ◽  
Author(s):  
Maria Carmela Sacchi ◽  
Fabrizio Forlini ◽  
Incoronata Tritto ◽  
Raniero Mendichi ◽  
Giulio Zannoni ◽  
...  
Keyword(s):  
Magnesium Chloride ◽  
Activation Effect ◽  
Ziegler Natta Catalysts

Crystalline magnesium chloride–electron donor complexes: new support materials for Ziegler–Natta catalysts

2017 ◽  
Vol 46 (13) ◽  
pp. 4452-4460 ◽  
Author(s):  
V. H. Nissinen ◽  
I. O. Koshevoy ◽  
T. T. Pakkanen
Keyword(s):  
Crystal Structure ◽  
Structure Formation ◽  
Magnesium Chloride ◽  
Donor Ligands ◽  
Nitrogen Donor Ligands ◽  
Support Materials ◽  
Polymerization Catalyst ◽  
Nitrogen Donor ◽  
Crystal Structure Formation ◽  
Ziegler Natta Catalysts

Chelating oxygen and nitrogen donor ligands (1,2-dimethoxyethane, 1,3-dimethoxypropane, and N,N′-diethylethylenediamine) are found to dictate the crystal structure formation of MgCl2, the important support component of a polymerization catalyst.

Role of the pair of internal and external donors in magnesium chloride-supported Ziegler-Natta catalysts

1991 ◽  
Vol 24 (26) ◽  
pp. 6823-6826 ◽  
Author(s):  
Maria Carmela Sacchi ◽  
Incoronata Tritto ◽  
Chengji Shan ◽  
Raniero Mendichi ◽  
Luciano Noristi
Keyword(s):  
Magnesium Chloride ◽  
Ziegler Natta Catalysts

scholarly journals Copolymerization of ethylene and propylene catalyzed by magnesium chloride supported vanadium/titanium bimetallic Ziegler-Natta catalysts

2011 ◽  
Vol 29 (4) ◽  
pp. 475-482 ◽  
Author(s):  
Tao Jiang ◽  
Hong-xia Chen ◽  
Chen-gang Cao ◽  
Guo-liang Mao ◽  
Wei Du ◽  
...  
Keyword(s):  
Magnesium Chloride ◽  
Vanadium Titanium ◽  
Ziegler Natta Catalysts

scholarly journals New Insight into Titanium–Magnesium Ziegler–Natta Catalysts Using Photoluminescence Spectroscopy

2020 ◽  
Vol 74 (10) ◽  
pp. 1209-1218
Author(s):  
Valentina N. Panchenko ◽  
Anton I. Kostyukov ◽  
Anton Yu Shabalin ◽  
Evgeniy A. Paukshtis ◽  
Tatiana S. Glazneva ◽  
...  
Keyword(s):  
Magnesium Chloride ◽  
Molecular Complexes ◽  
Sample Surface ◽  
Photoluminescence Spectroscopy ◽  
Luminescence Spectra ◽  
Spectroscopic Methods ◽  
Excitation Spectra ◽  
Donor Acceptor ◽  
Diffuse Reflectance Infrared ◽  
Ziegler Natta Catalysts

This paper presents the results of study of titanium–magnesium catalysts often used in polymerization processes, by photoluminescence spectroscopy (PL) in combination with diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The interaction of dibutyl phthalate (DBP) with MgCl2 was studied at DBPadded/Mg = 0–1 (mol/mol). The luminescence spectra with excitation at 278 nm and the excitation spectra for main emission bands were recorded. It was shown that DBP adsorbed on magnesium chloride, both in the form of donor–acceptor complexes (D+A–) and in the form of molecular complexes. At DBPadded/Mg <0.15, the formation of D+A– complexes occur predominantly; with an increase in DBPadded/Mg, the fraction of molecular complexes increases. Molecular complexes are destroyed during the treatment of the support by TiCl4. In this case, the structure of magnesium chloride is disordered and new coordination–unsaturated sites are formed. This work is a first attempt to apply PL spectroscopy in combination with DRIFTS spectroscopy to study titanium–magnesium Ziegler–Natta catalysts. The application of PL spectroscopy to such systems made it possible to detect interactions within and between donor molecules, which would be particularly challenging to achieve using other spectroscopic methods. Both spectroscopic methods provided crucial information about the existence of two types of complexes on the sample surface which is important for tuning the synthesis procedure of the titanium–magnesium catalysts for olefin polymerization.

Stereochemical investigation of the initiation step in MgCl2-supported Ziegler-Natta catalysts: the Lewis base activation effect

1990 ◽  
Vol 23 (2) ◽  
pp. 383-386 ◽  
Author(s):  
Maria Carmela Sacchi ◽  
Chengji Shan ◽  
Paolo Locatelli ◽  
Incoronata Tritto
Keyword(s):  
Lewis Base ◽  
Activation Effect ◽  
Initiation Step ◽  
Ziegler Natta Catalysts
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