Effect of Zr-Modified SiO2-Supported Metallocene/MAO Catalyst on Copolymerization of Ethylene/1-Octene

Pothirat, Tipawan; Jongsomjit, Bunjerd; Praserthdam, Piyasan

doi:10.1007/s10562-007-9327-y

Cited by 11 publications

(10 citation statements)

References 20 publications

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“…In order to prove the interaction between the tungsten oxide and support, TGA measurement was performed. The TGA can provide the useful information on the degree of interaction for adsorbed species bound to support in terms of weight loss and removal temperature [20,[30][31][32][33]. The TGA profiles for all catalysts are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Study on Solvent/Alkoxide Molar Ratios on Synthesis Zirconia Nanoparticles for Tungstated Zirconia Catalysts Over Esterification

2010

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A series of nanocrystal zirconia samples were synthesized, characterized and studied for the esterification reaction. The results showed that the solvothermal method under different solvent/alkoxide molar ratios led to remarkable effect on the amount of carbon residue remained on the surface of catalysts resulting in the difference in proton species-support interaction behavior. Moreover, the esterification activity of W/ZrO 2 varied distinctly with the solvothermal synthesis condition of nanocrystal zirconia.

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Section: Resultsmentioning

confidence: 99%

Study on Solvent/Alkoxide Molar Ratios on Synthesis Zirconia Nanoparticles for Tungstated Zirconia Catalysts Over Esterification

2010

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“…The fragmentation of silica supported catalyst and the resulting morphology of olefin polymer depend upon many factors, such as silica morphology, catalyst immobilization procedure, polymer molecular weight, and reaction conditions. As a result, different polymer morphologies are frequently reported depending upon the specific catalyst compositions and silica types …”

Section: Introductionmentioning

confidence: 99%

“…The exterior and interior structures of polymer particles synthesized over silica‐supported catalysts have been analyzed by many researchers using scanning and transmission electron microscopy . However, directly observing the growth of polymer at the catalyst sites and to understand how the polymer growth leads to specific particle morphology has been a difficult problem.…”

Section: Introductionmentioning

confidence: 99%

Morphological Study of Nascent Growth of α‐Olefin Polymers on Spatially Unconstrained Silica Surfaces

Tran

Choi

2018

Macro Reaction Engineering

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The experimental study of polymer growth on spatially unconstrained flat silica surfaces is presented for propylene and ethylene polymerization in liquid and gas phases with high activity metallocene catalyst (rac‐Et(Indenyl)2ZrCl2/ methylaluminoxane at 30–70 °C and 30–50 psig. The study shows a surprisingly rich spectrum of nascent morphologies for each polymer synthesized in two different reaction phases. In propylene polymerization in a liquid phase, polypropylene nanofibrils are first formed at the catalyst sites and quickly develop into microglobular morphology, whereas in ethylene polymerization in a liquid phase, polyethylene nanofibrils formed at the catalyst sites grow to a ribbon‐like morphology. In gas phase polymerization where polymerization rate is much lower due to low monomer concentration, both polymers grow to compact aggregates of globules. Unlike in liquid phase polymerization, no ribbon‐like structure is formed in ethylene polymerization. The sequential polymerization of these olefin monomers has also been carried out and the experimental data show two distinct regions of corresponding polymers as observed in separate ethylene and propylene homopolymerization experiments.

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“…The most typical example was the application of chemically modified silica to Phillips catalyst . ZN and metallocene catalysts were also reported to benefit much from support modification . In this work, we synthesized a series of compounding supports by modifying silica with alumina, zirconia, and titania, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…[43] ZN and metallocene catalysts were also reported to benefit much from support modification. [44][45][46] In this work, we synthesized a series of compounding supports by modifying silica with alumina, zirconia, and titania, respectively. A series of vanadium-oxide-based catalysts supported with the modified and unmodified silica was prepared as well.…”

Section: Introductionmentioning

confidence: 99%

The First Vanadium-Oxide-Based UHMWPE Catalyst Supported on Chemically Modified Silica Gel

Jin

Cheng

et al. 2017

Macromol. Chem. Phys.

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Novel vanadium‐oxide‐based catalysts supported on alumina, zirconia, or titania‐modified silica, which are able to synthesize ultrahigh molecular weight polyethylene (UHMWPE), are successfully developed. Compared with the unmodified silica supported catalyst, the activities of the modified catalysts are substantially enhanced. By changing the polymerization temperature (Tp) from 90 to 60 °C, the molecular weight of the produced UHMWPE can be easily regulated from 2 × 106 to more than 6 × 106 g mol−1. It is the first time that chloride‐free nonsingle site catalysts have been developed to synthesize UHMWPE within such a broad range of Tp. Catalyst characterization by NH3‐temperature‐programmed desorption and pyridine‐Fourier transform infrared spectroscopy reveals that the modified catalysts have increased acidity derived from both Lewis and Brønsted acid sites. The X‐ray photoelectron spectroscopy characterization indicates that the vanadium on the modified catalysts is more electron deficient. Thus, the acidity of the catalysts and the electronic state of the vanadium play a critical role in determining the activity of the vanadium active sites for ethylene polymerization.

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Effect of Zr-Modified SiO2-Supported Metallocene/MAO Catalyst on Copolymerization of Ethylene/1-Octene

Cited by 11 publications

References 20 publications

Study on Solvent/Alkoxide Molar Ratios on Synthesis Zirconia Nanoparticles for Tungstated Zirconia Catalysts Over Esterification

Study on Solvent/Alkoxide Molar Ratios on Synthesis Zirconia Nanoparticles for Tungstated Zirconia Catalysts Over Esterification

Morphological Study of Nascent Growth of α‐Olefin Polymers on Spatially Unconstrained Silica Surfaces

The First Vanadium-Oxide-Based UHMWPE Catalyst Supported on Chemically Modified Silica Gel

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