Spherical MgCl<sub>2</sub> Supported Iron Catalyst for Ethylene Polymerization: Effect of the Preparation Procedure on Catalyst Activity and the Morphology of Polyethylene Particles

Huang, R Rubin; Liu, Dongbing; Wang, Shibo; Mao, Bingquan

doi:10.1002/macp.200300213

Cited by 59 publications

(35 citation statements)

References 17 publications

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“…In addition to other polystyrene [138] and silica supports [139,140,141,142,143,144] , iron and cobalt precatalysts have been immobilised on calcosilicate [145] , magnesium dichloride [146,147,148,149] , MCM-41 zeolite [150,151] , clay [152] and fluorotetrasilicic mica [153] . Supported systems have also been examined using alternative activators [154,155,156,157,158,159] .…”

Section: Supported Catalystsmentioning

confidence: 99%

Iron-Based and Cobalt-Based Olefin Polymerisation Catalysts

Gibson¹,

Solan²

2008

Topics in Organometallic Chemistry

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This chapter describes the brief history of iron or cobalt catalysts for olefin polymerisation and oligomerisation. Since the discovery in 1998 that 2,6-bis(imino)pyridine iron and cobalt halides, on activation with MAO, can convert ethylene to highly linear polyethylene, numerous reports have been concerned with ligand modification, mechanisms for precatalyst activation, identifying the active species and understanding the mode of propagation/chain transfer. In addition, heterogenisation of this class of catalysts, their incorporation into macrocycles/ polymers and their use in reactor blending/tandem catalysis has seen some important developments; alternative ligand architectures that can support active iron and cobalt catalysts are also discussed as are different types of olefinic monomer.

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Section: Supported Catalystsmentioning

confidence: 99%

Iron-Based and Cobalt-Based Olefin Polymerisation Catalysts

Gibson¹,

Solan²

2008

Topics in Organometallic Chemistry

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“…On adsorption on the support surface, the structure of the LFeCl 2 molecule is mainly retained. Highly active supported catalysts were also prepared by supporting LFeCl 2 on magnesium chloride MgCl 2 , [13,14] Summary: The number of active centers (C P ) and propagation rate constants (k P ) for polymerization of ethylene with supported catalysts LFeCl 2 /SiO 2 , LFeCl 2 /Al 2 O 3 and LFeCl 2 /MgCl 2 (L ¼ 2,6-(2,6-(Me) 2 C 6 H 3 N CMe) 2 C 5 H 3 N), activated by an Al(i-Bu) 3 co-catalyst, were determined by a method of polymerization inhibition with radioactive 14 CO. In contrast to homogeneous systems based on LFeCl 2 , the supported catalysts are highly active and stable in ethylene polymerization at 70-80 8C.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of Ethylene Polymerization Over Supported Bis(imino)pyridine Iron (II) Catalysts

Барабанов

Букатов

Захаров

et al. 2006

Macro Chemistry & Physics

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Summary: The number of active centers (CP) and propagation rate constants (kP) for polymerization of ethylene with supported catalysts LFeCl2/SiO2, LFeCl2/Al2O3 and LFeCl2/MgCl2 (L = 2,6‐(2,6‐(Me)2C6H3NCMe)2C5H3N), activated by an Al(i‐Bu)3 co‐catalyst, were determined by a method of polymerization inhibition with radioactive 14CO. In contrast to homogeneous systems based on LFeCl2, the supported catalysts are highly active and stable in ethylene polymerization at 70–80 °C. In the presence of hydrogen, the activity of the supported catalysts substantially increases (2–4 fold). The data obtained on the effect of hydrogen on the calculated CP and kP values suggests that for ethylene polymerization without hydrogen, the “dormant” active centers are formed in the catalytic systems. A scheme for the formation of these “dormant” centers and their reactivation in presence of hydrogen is suggested. For the investigated supported catalysts the CP values were found to be only 2 to 4% of the total iron complex content in the catalysts. The kP value for the catalysts prepared using different supports (SiO2, Al2O3 and MgCl2) were close (3.2 × 104 to 4.5 × 104 L · (mol · s)−1 at 70 °C). The support composition affects neither the molecular mass (MM) nor the molecular mass distribution (MMD) of the polymers produced. The obtained CP and kP values and data on the polymer MM and MMD lead to conclusion that the nature of the support has almost no effect on the structure of the active centers and the distribution of their reactivity.Effect of support on the MMD of PE produced over supported LFeCl2 catalysts.magnified imageEffect of support on the MMD of PE produced over supported LFeCl2 catalysts.

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“…The samples were prepared according to the procedure reported in reference [28]. XRD (Phillips PW 3040/60 X Pert Pro) powder diffractometer was used for analysis, using nickel filtered copper K alpha radiations with generator setting of 40 KeV.…”

Section: The Catalyst Characterizationmentioning

confidence: 99%

Heterogeneous Supported Catalysts for Butadiene Polymerization: The Effect of Calcination Temperature and Solvent

Hussain¹,

Naheed²,

Badshah³

et al. 2010

TOCATJ

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Abstract:The polymerization of butadiene was studied using heterogeneous cobalt nickel (oxide) bimetallic catalyst. The prepared catalyst was subjected to calcination at different temperatures. This treatment results in the formation of different phases with multiple oxidation states. The characterization of the catalyst was carried out by XRD, SEM, EDX, TGA, FTIR and TPR/TPD. The catalytic activity was studied for the polymerization of butadiene gas in toluene, n-hexane and ethanol in a Parr reactor system. The products obtained, were characterized by FTIR, GC/MS, 1 H and 1 3 C NMR spectroscopy, Laser Light Scattering (LLS) and GPC.The best activity was achieved on the catalyst sample calcined at 1173 K in ethanol solvent. The product contains aliphatic and aromatic carbonyl compounds and polybutadiene terminated by OH group. The GPC and LLS studies indicates that polydispersity of the products are in the narrow range and high molecular weight product.The study reflects that the catalytic reaction conditions, the calcinations temperatures which control the oxidation state, phase of the catalyst and stability of the catalyst are mainly responsible for the change in products selectivity.

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Spherical MgCl₂ Supported Iron Catalyst for Ethylene Polymerization: Effect of the Preparation Procedure on Catalyst Activity and the Morphology of Polyethylene Particles

Cited by 59 publications

References 17 publications

Iron-Based and Cobalt-Based Olefin Polymerisation Catalysts

Iron-Based and Cobalt-Based Olefin Polymerisation Catalysts

Kinetic Study of Ethylene Polymerization Over Supported Bis(imino)pyridine Iron (II) Catalysts

Heterogeneous Supported Catalysts for Butadiene Polymerization: The Effect of Calcination Temperature and Solvent

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Spherical MgCl2 Supported Iron Catalyst for Ethylene Polymerization: Effect of the Preparation Procedure on Catalyst Activity and the Morphology of Polyethylene Particles

Cited by 59 publications

References 17 publications

Iron-Based and Cobalt-Based Olefin Polymerisation Catalysts

Iron-Based and Cobalt-Based Olefin Polymerisation Catalysts

Kinetic Study of Ethylene Polymerization Over Supported Bis(imino)pyridine Iron (II) Catalysts

Heterogeneous Supported Catalysts for Butadiene Polymerization: The Effect of Calcination Temperature and Solvent

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Spherical MgCl₂ Supported Iron Catalyst for Ethylene Polymerization: Effect of the Preparation Procedure on Catalyst Activity and the Morphology of Polyethylene Particles