Transition-metal organometallic compounds as cocatalysts in olefin polymerization with magnesium chloride-supported catalysts

1993 ◽  
Vol 26 (25) ◽  
pp. 6771-6775 ◽  
Author(s):  
Maurizio Galimberti ◽  
Fabrizio Piemontesi ◽  
Umberto Giannini ◽  
Enrico Albizzati
Keyword(s):  
Transition Metal ◽  
Magnesium Chloride ◽  
Olefin Polymerization ◽  
Supported Catalysts ◽  
Organometallic Compounds

Techniques in the synthesis of organometallic compounds of Hafnium

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Meeshar Shahid ◽  
Mahvish Abbasi ◽  
Munazzah Yaqoob ◽  
Rosenani A. Haque ◽  
Muhammad Adnan Iqbal
Keyword(s):  
Transition Metal ◽  
Olefin Polymerization ◽  
Transition Element ◽  
Organometallic Compounds ◽  
Polymerization Catalysts ◽  
Nitrogen And Phosphorus ◽  
Current Review ◽  
The Earth ◽  
Different Temperatures

Abstract Hafnium is a transition metal and it is the 45th most abundant transition element present on the earth. Hafnium has been successfully alloyed with several metals including titanium, iron, and niobium. Hafnium complexes are less active olefin polymerization catalysts. In the current review synthesis of hafnium complexes involving bonding through different linkages like “carbon, nitrogen, oxygen, carbon and oxygen, nitrogen and cobalt nitrogen and oxygen, nitrogen and phosphorus, nitrogen and sulfur, phosphorus and carbon, phosphorus and oxygen, sulfur carbon and oxygen, carbon–nitrogen and oxygen, carbon–nitrogen and phosphorus, carbon–nitrogen oxygen, sulfur and phosphorus, carbon–oxygen phosphorus and nitrogen”. The commonly used solvents for the synthesis of Hafnium complexes are tetrahydrofuran, n-hexane, and toluene, etc. These complexes were mostly reported at different temperatures ranges from −35 to 110 °C with continuous stirring, according to the nature of ligands. An overview of techniques in the synthesis of Hafnium complexes through various routes has been compiled.

ORGANOMETALLIC COMPOUNDS IN OLEFIN POLYMERIZATION

2006 ◽  
Vol 125 (1) ◽  
pp. 183-188 ◽  
Author(s):  
J. J. Smith ◽  
W. L. Carrick ◽  
A. K. Ingberman
Keyword(s):  
Olefin Polymerization ◽  
Organometallic Compounds

scholarly journals The charge percolation mechanism and simulation of Ziegler-Natta polymerizations, part VI: Mechanism of ethylene polymerization by supported chromium oxide

2007 ◽  
Vol 72 (11) ◽  
pp. 1155-1169 ◽  
Author(s):  
Dragoslav Stoiljkovic ◽  
Branka Pilic ◽  
Misa Bulajic ◽  
Nebojsa Djurasovic ◽  
Nikolaj Ostrovski
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Chromium Oxide ◽  
Ethylene Polymerization ◽  
Olefin Polymerization ◽  
Intensive Research ◽  
A Charge

Despite intensive research over the last 50 years, many questions concerning ethylene polymerization by supported chromium oxide are still unanswered. Hence, the very fundamental issues of this polymerization are discussed in this paper. It is shown that a charge percolation mechanism (CPM) of olefin polymerization by Ziegler-Natta transition metal complexes, recently proposed by us, can give the answers in this case, too.

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