Adsorption of TiCl4 and electron donor on defective MgCl2 surfaces and propylene polymerization over Ziegler-Natta catalyst: A DFT study
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چکیده
منابع مشابه
Ziegler-Natta catalysts for propylene polymerization – Interaction of an external donor with the catalyst
The interaction of the external donor (propyltrimethoxysilane - PTMS) with titanium-magnesium catalysts (TMCs) containing dibutylphthalate (DBP) as internal donor, which were prepared in different ways, was studied by chemical analysis and infrared diffuse reflectance spectroscopy (DRIFTS). The chemical composition of the catalysts after their interaction with heptane solutions of PTMS, PTMS/Al...
متن کاملziegler-natta catalysts for propylene polymerization – interaction of an external donor with the catalyst
the interaction of the external donor (propyltrimethoxysilane - ptms) with titanium-magnesium catalysts (tmcs) containing dibutylphthalate (dbp) as internal donor, which were prepared in different ways, was studied by chemical analysis and infrared diffuse reflectance spectroscopy (drifts). the chemical composition of the catalysts after their interaction with heptane solutions of ptms, ptms/al...
متن کاملIn-Situ Polymerization of UHMWPE Using Bi-Supported Ziegler-Natta Catalyst of MoS2 Oxide/MgCl2 (Ethoxide Type)/TiCl4/TiBA: Study of Thermo-Mechanical Properties of System
The use of UHMWPE has attracted the attention of many researchers and industries. The aim of the present work is to fabricate UHMWPE/MoS2-Oxide nano-composites using in-situ polymerization. For this purpose, modified molybdenum disulfide was used. In order to perform the polymerization, a Ziegler-Natta catalytic system, with MoS2-Oxide and magnesium Ethoxide as support, was used. In order to fa...
متن کاملcopolymerization of ethylene and propylene using 4th generation ziegler- natta catalyst: influence of cocatalyst, external electron donor and hydrogen
copolymerization of ethylene and propylene was investigated using a 4th generation phthalate ziegler-natta catalyst in normal hexane in a buchi reactor. the effects of different mole fractions of [al]/[ti], [si]/[al] and various amounts of hydrogen on productivity and weight percent of ethylene on the product, were studied. in the copolymerization reactions, tri-isobutyl aluminum (tibal) was us...
متن کاملA Study of Ziegler–Natta Propylene Polymerization Catalysts by Spectroscopic Methods
Ziegler-Natta polymerization catalysts were characterized by a complex of surface- and bulk-sensitive methods (DRIFTS, XPS, ESR, and XAS = XANES + EXAFS). A diffuse-reflectance Fourier-transform IR spectroscopy (DRIFTS) study showed the presence of strong Lewis acid sites in different concentrations and absence of strong basic sites in the polymerization catalysts. X-ray photoelectron spectrosc...
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ژورنال
عنوان ژورنال: Chinese Journal of Polymer Science
سال: 2013
ISSN: 0256-7679,1439-6203
DOI: 10.1007/s10118-013-1252-5