Infrared spectral characterization of supported propene polymerization catalysts

Arzoumanidis, Gregory G.; Karayannis, Nicholas M.

doi:10.1016/0166-9834(91)80049-3

Cited by 29 publications

(12 citation statements)

References 22 publications

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“…On the other hand, the long-wavelength shift of the bands in the PL spectra of these samples can be associated with interactions with neighboring molecules, for example, chlorine atoms or OH groups, always present in magnesium chloride due to the trace amounts of water. 25 , 37 …”

Section: Resultsmentioning

confidence: 99%

New Insight into Titanium–Magnesium Ziegler–Natta Catalysts Using Photoluminescence Spectroscopy

et al. 2020

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This paper presents the results of study of titanium–magnesium catalysts often used in polymerization processes, by photoluminescence spectroscopy (PL) in combination with diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The interaction of dibutyl phthalate (DBP) with MgCl2 was studied at DBPadded/Mg = 0–1 (mol/mol). The luminescence spectra with excitation at 278 nm and the excitation spectra for main emission bands were recorded. It was shown that DBP adsorbed on magnesium chloride, both in the form of donor–acceptor complexes (D+A–) and in the form of molecular complexes. At DBPadded/Mg <0.15, the formation of D+A– complexes occur predominantly; with an increase in DBPadded/Mg, the fraction of molecular complexes increases. Molecular complexes are destroyed during the treatment of the support by TiCl4. In this case, the structure of magnesium chloride is disordered and new coordination–unsaturated sites are formed. This work is a first attempt to apply PL spectroscopy in combination with DRIFTS spectroscopy to study titanium–magnesium Ziegler–Natta catalysts. The application of PL spectroscopy to such systems made it possible to detect interactions within and between donor molecules, which would be particularly challenging to achieve using other spectroscopic methods. Both spectroscopic methods provided crucial information about the existence of two types of complexes on the sample surface which is important for tuning the synthesis procedure of the titanium–magnesium catalysts for olefin polymerization.

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Section: Resultsmentioning

confidence: 99%

New Insight into Titanium–Magnesium Ziegler–Natta Catalysts Using Photoluminescence Spectroscopy

et al. 2020

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“…It can be applied to probe the state of carbonyl groups in ester internal donors, since the m C=O absorption band is very sensitive to coordination with a Lewis acid. IR spectroscopy has been extensively applied to Ziegler-Natta catalysts [17]. With regard to propylene polymerization catalysts, most of the work has focused on the spectral changes in the m C=O of the internal aromatic ester in various stages of catalyst preparation [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Planar Ziegler-Natta Model Catalysts Using Attenuated Total Reflection Infrared Spectroscopy

et al. 2009

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A sensitive method is presented for the investigation of planar Ziegler-Natta model catalysts by means of attenuated total internal reflection Fourier transform infrared spectroscopy. A solution of MgCl 2 in ethanol, optionally containing an internal donor, was spin-coated directly onto a planar ZnSe ATR crystal. Ethylene and propylene polymerization was monitored in situ and exsitu, respectively, and interaction of a diester internal donor with MgCl 2 and TiCl 4 was investigated. The isotacticity of the polypropylene produced in the presence and absence of donor was estimated based on characteristic peaks in the infrared spectra.

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“…There is spectroscopic and X-ray structural evidence to show that the electron donors can, and do co-ordinate to titanium and magnesium ions [3]. There is some evidence to suggest that electron donors deactivate the atactic catalytic sites [4].…”

Section: Introductionmentioning

confidence: 99%

Density functional study on the role of electron donors in propylene polymerization using Ziegler–Natta catalyst

Mukhopadhyay¹,

Kulkarni²,

Bhaduri

2005

Journal of Organometallic Chemistry

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Infrared spectral characterization of supported propene polymerization catalysts

Cited by 29 publications

References 22 publications

New Insight into Titanium–Magnesium Ziegler–Natta Catalysts Using Photoluminescence Spectroscopy

New Insight into Titanium–Magnesium Ziegler–Natta Catalysts Using Photoluminescence Spectroscopy

Investigation of Planar Ziegler-Natta Model Catalysts Using Attenuated Total Reflection Infrared Spectroscopy

Density functional study on the role of electron donors in propylene polymerization using Ziegler–Natta catalyst

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