Metallocene catalysts on complex magnesium support modified by organoaluminum compounds

Nowakowska, Maria; Ochędzan‐Siodłak, Wioletta; Kordowska, Monika

doi:10.14314/polimery.2000.323

Cited by 7 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The MgCl 2 (THF) 2 /Et 2 AlCl phase was proposed as a support for Zr2 by Nowakowska and colleagues [ 125 , 137 ], who assumed the formation of the catalyst precursor Cp 2 Zr(μ-Cl)(μ-Et)Al(μ-Cl)(μ-THF)Mg on the surface of MgCl 2 (THF) 2 , which was activated by MAO without desorption. Activation of this catalyst by R 3 Al was not studied.…”

Section: Metal Halidesmentioning

confidence: 99%

MAO- and Borate-Free Activating Supports for Group 4 Metallocene and Post-Metallocene Catalysts of α-Olefin Polymerization and Oligomerization

Nifant’ev,

Komarov,

Kostomarova

et al. 2023

Polymers

View full text Add to dashboard Cite

Modern industry of advanced polyolefins extensively uses Group 4 metallocene and post-metallocene catalysts. High-throughput polyolefin technologies demand the use of heterogeneous catalysts with a given particle size and morphology, high thermal stability, and controlled productivity. Conventional Group 4 metal single-site heterogeneous catalysts require the use of high-cost methylalumoxane (MAO) or perfluoroaryl borate activators. However, a number of inorganic phases, containing highly acidic Lewis and Brønsted sites, are able to activate Group 4 metal pre-catalysts using low-cost and affordable alkylaluminums. In the present review, we gathered comprehensive information on MAO- and borate-free activating supports of different types and discussed the surface nature and chemistry of these phases, examples of their use in the polymerization of ethylene and α-olefins, and prospects of the further development for applications in the polyolefin industry.

show abstract

Section: Metal Halidesmentioning

confidence: 99%

MAO- and Borate-Free Activating Supports for Group 4 Metallocene and Post-Metallocene Catalysts of α-Olefin Polymerization and Oligomerization

Nifant’ev,

Komarov,

Kostomarova

et al. 2023

Polymers

View full text Add to dashboard Cite

show abstract

“…Po uprzednim aktywowaniu otrzymanych katalizatorów trietyloglinem (AlEt 3 ) badano zachowanie siê tych uk³adów w reakcji polimeryzacji etylenu (rys. [1][2][3]. Stwierdzono, ¿e bez wzglêdu na sposób syntezy wszystkie trzy uk³ady katalityczne two-rz¹ centra aktywne jednego rodzaju.…”

unclassified

“…In our earlier reports it was found that when anchored to the MgCl 2 (THF) 2 support modified by AlEt 2 Cl (Al/Mg molar ratio = 1/1) and activated by AlEt 3 and methylaluminoxane (MAO) respectively, the titanium (TiCl 4 ) [1,2] and zirconocene (Cp 2 ZrCl 2 ) [3,4] catalysts used in ethylene polymerization formed two kinds of active sites. The double site character of the studied catalysts was proven by the kinetics investigations of ethy-lene polymerization reaction and the properties of the polyethylene (PE) produced, i.e.…”

mentioning

confidence: 99%

“…The double site character of the studied catalysts was proven by the kinetics investigations of ethy-lene polymerization reaction and the properties of the polyethylene (PE) produced, i.e. the bimodal molecular weight distributions (MWDs) and particle size [1,3,4]. The undesirable active site was formed due to the presence of "free" AlEt 2 Cl unbounded to the MgCl 2 (THF) 2 structure.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Titanium catalyst (TiCl4) supported on MgCl2(THF)(AlEt2Cl)0,34 for ethylene polymerization

Nowakowska¹

2007

Polimery

Self Cite

View full text Add to dashboard Cite

Three titanium catalyst systems supported on the MgCl2(THF)(AlEt2Cl)0.34 complex were synthesised by changing both the synthetic method and the precursor/support ratio. After activation by AlEt 3 , the catalysts were applied for ethylene polymerization. All three systems proved to be single site catalysts regardless of the method of synthesis. This was confirmed by the kinetics curve character and the properties of the produced polyethylene. Due to the simultaneous reaction reduction and immobilization of TiCl 4 (at AlEt 2 Cl/TiCl 4 molar ratio greater than 1) the actual time for the polymerization reaction to begin can be shortened to the minimum needed to only dissolve the ethylene in the reaction medium. Furthermore, the amount of the AlEt3 activator (AlEt3/TiCl4 < 1000) is also considerably reduced when the high activity of the catalyst is maintained.

show abstract

Copolymerization of ethylene with 1‐hexene over metallocene catalyst supported on complex of magnesium chloride with tetrahydrofuran

Czaja

Białek

Utrata

2004

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

The study of ethylene/1‐hexene copolymerization with the zirconocene catalyst, bis(cyclopentadienyl)zirconium dichloride (Cp2ZrCl2)/methylaluminoxane (MAO), anchored on a MgCl2(THF)2 support was carried out. The influence of 1‐hexene concentration in the feed on catalyst productivity and comonomer reactivity as well as other properties was investigated. Additionally, the effect of support modification by the organoaluminum compounds [(MAO, trimethlaluminum (AlMe3), or diethylaluminum chloride (Et2AlCl)] on the behavior of the MgCl2(THF)2/Cp2ZrCl2/MAO catalyst in the copolymerization process and on the properties of the copolymers was explored. Immobilization of the Cp2ZrCl2 compound on the complex magnesium support MgCl2(THF)2 resulted in an effective system for the copolymerization of ethylene with 1‐hexene. The modification of the support as well as the kind of organoaluminum compound used as a modifier influenced the activity of the examined catalyst system. Additionally, the profitable influence of immobilization of the homogeneous catalyst as well as modification of the support applied on the molecular weight and molecular weight distribution of the copolymers was established. Finally, with the successive self‐nucleation/annealing procedure, the copolymers obtained over both homogeneous and heterogeneous metallocene catalysts were heterogeneous with respect to their chemical composition. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 2512–2519, 2004

show abstract

Metallocene catalysts on complex magnesium support modified by organoaluminum compounds

Cited by 7 publications

References 0 publications

MAO- and Borate-Free Activating Supports for Group 4 Metallocene and Post-Metallocene Catalysts of α-Olefin Polymerization and Oligomerization

MAO- and Borate-Free Activating Supports for Group 4 Metallocene and Post-Metallocene Catalysts of α-Olefin Polymerization and Oligomerization

Titanium catalyst (TiCl4) supported on MgCl2(THF)(AlEt2Cl)0,34 for ethylene polymerization

Copolymerization of ethylene with 1‐hexene over metallocene catalyst supported on complex of magnesium chloride with tetrahydrofuran

Contact Info

Product

Resources

About