Chromium ions within zeolites. Part 3.—The influence of the valence state of chromium on the catalytic activity of Cr zeolites in ethylene polymerization

1983 ◽  
Vol 79 (7) ◽  
pp. 1591 ◽  
Author(s):  
Zdenka Tvarůžková ◽  
Blanka Wichterlová
Keyword(s):  
Catalytic Activity ◽  
Valence State ◽  
Ethylene Polymerization ◽  
Chromium Ions

scholarly journals Thermal Effect of Ceramic Nanofiller Aluminium Nitride on Polyethylene Properties

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Omer Bin Sohail ◽  
P. A. Sreekumar ◽  
S. K. De ◽  
Masihullah Jabarullah Khan ◽  
Abbas Hakeem ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ethylene Polymerization ◽  
Filler Loading ◽  
Aluminium Nitride ◽  
Thermal Gravimetric ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Nano Composite ◽  
X Ray ◽  
Thermal Gravimetric Analyzer

Ethylene polymerization was done to form polyethylene nano-composite with nanoaluminum nitride using zirconocene catalysts. Results show that the catalytic activity is maximum at a filler loading of 15 mg nanoaluminum nitride. Differential scanning calorimeter (DSC) and X-ray diffraction (XRD) results show that percentage crystallinity was also marginally higher at this amount of filler. Thermal behavior of polyethylene nanocomposites (0, 15, 30, and 45) mg was studied by DSC and thermal gravimetric analyzer (TGA). Morphology of the component with 15 mg aluminium nitride is more fibrous as compared to 0 mg aluminium nitride and higher filler loading as shown by SEM images. In order to understand combustibility behavior, tests were performed on microcalorimeter. Its results showed decrease in combustibility in polyethylene nanocomposites as the filler loading increases.

scholarly journals Effect of the Reduction of the Nickel-Carbon Catalyst on the Catalytic Activity in Ethylene Polymerization

1968 ◽  
Vol 71 (8) ◽  
pp. 1238-1242
Author(s):  
Toshio TADOKORO ◽  
Teikichi HOSOI ◽  
Masahiko KATSURAYAMA ◽  
Hiroshi KONISHI
Keyword(s):  
Catalytic Activity ◽  
Ethylene Polymerization ◽  
Carbon Catalyst

NNN-type iron(II) complexes consisting sterically hindered dibenzocycloheptyl group: Synthesis and catalytic activity towards ethylene polymerization

2020 ◽  
Vol 492 ◽  
pp. 110981 ◽  
Author(s):  
Muhammad Zada ◽  
Arumugam Vignesh ◽  
Hongyi Suo ◽  
Yanping Ma ◽  
Hua Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ethylene Polymerization ◽  
Sterically Hindered

Trinuclear alkyl hydrido rare-earth complexes supported by amidopyridinato ligands: synthesis, structures, C–Si bond activation and catalytic activity in ethylene polymerization

2014 ◽  
Vol 43 (38) ◽  
pp. 14450-14460 ◽  
Author(s):  
Dmitry M. Lyubov ◽  
Anton V. Cherkasov ◽  
Georgy K. Fukin ◽  
Sergey Yu. Ketkov ◽  
Andrey S. Shavyrin ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Rare Earth ◽  
Ethylene Polymerization ◽  
Bond Activation ◽  
Rare Earth Complexes

[(Ap9MeLu)3(μ2-H)3(μ3-H)2(CH2SiMe3)(thf)2] was synthesized. For Y and Yb C–Si bond activation occurs affording [(Ap9MeLu)3(μ2-H)3(μ3-H)2(CH2SiMe3)(thf)2] and [(Ap9MeLn)3(μ2-H)3(μ3-H)2(CH2SiH2Ph)(thf)2].

Ethylene Polymerization by Thioether Bridged Dinuclear Titanocene Complex

2011 ◽  
Vol 213 ◽  
pp. 354-357 ◽  
Author(s):  
Yu Jing Nie ◽  
Ming Yang
Keyword(s):  
Molecular Weight ◽  
Catalytic Activity ◽  
Ethylene Polymerization ◽  
Gel Permeation Chromatography ◽  
Molar Ratio ◽  
Polymerization Temperature ◽  
High Concentration ◽  
Highly Active ◽  
Cyclopentadienyl Ligand ◽  
Broad Molecular Weight Distribution

The thioether bridged metallocene complex [(C5H5)Cl2TiC5H4CH2CH2]2S has been synthesized by treating the dilithium salts of the thioether bridged cyclopentadienyl ligand with two equivalents of C5H5TiCl3 and characterized by 1HMNR and elemental analysis. After activation with methylaluminoxane (MAO), the complex was highly active catalysts for homogeneous ethylene polymerization in toluene. The influence of the molar ratio [MAO]/[Cat], the catalyst concentration, time and temperature have been studied systematically. The catalytic activity of 1 is 3.63×105 g PE/mol•Cat•h. Rising the polymerization temperature decreases the catalytic activity for 1. A high concentration of the catalysts drops the catalytic activity as well as the molecular weight of polyethylene for the complex. High temperature gel permeation chromatography (HT-GPC) proves the production of polyethylene with a broad molecular weight distribution (MWD).

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