Formation of Isolated Titanium(III) Ions as Active Sites of Supported Titanium-Magnesium Catalysts for Polymerization of Olefins Full article
| Journal |
Macromolecular Chemistry and Physics
ISSN: 1022-1352 , E-ISSN: 1521-3935 |
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| Output data | Year: 2014, Volume: 215, Number: 18, Pages: 1707-1720 Pages count : 14 DOI: 10.1002/macp.201400142 | ||||
| Tags | catalysts, polyethylene, polypropylene, Ziegler-Natta polymerization | ||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | The Ministry of Education and Science of the Russian Federation |
Abstract:
Electron spin resonance (ESR) studies reveal a high yield of isolated Ti3+ compounds (30-70% of the total titanium content) that form in superactive supported titanium-magnesium catalysts (TMCs) of composition TiCl4/MgCl2 with a low titanium content (<= 0.1 wt%) after their interaction with different aluminum trialkyls (AlR3). These catalysts strongly differ from conventional TMCs with titanium contents of 1-3 wt%, which produce a set of isolated or associated Ti(II) and Ti(III) species after the interaction with the AlR3. A correlation is found between the content of the isolated Ti(III) ions and the activity in ethylene polymerization. According to temperature rising elution fractionation (TREF) data, the catalysts with a low titanium content (isolated Ti(III) ions) mainly produce polypropylene with a very high atactic-fraction content. Organic products formed on the interaction of AlEt3 and AlMe3 with TMC are identified. The data obtained allow a scheme of Ti3+ and Ti2+ compounds formed in these catalysts to be proposed.
Cite:
Mikenas T.B.
, Koshevoy E.I.
, Zakharov V.A.
, Nikolaeva M.I.
Formation of Isolated Titanium(III) Ions as Active Sites of Supported Titanium-Magnesium Catalysts for Polymerization of Olefins
Macromolecular Chemistry and Physics. 2014. V.215. N18. P.1707-1720. DOI: 10.1002/macp.201400142 WOS Scopus РИНЦ ANCAN OpenAlex
Formation of Isolated Titanium(III) Ions as Active Sites of Supported Titanium-Magnesium Catalysts for Polymerization of Olefins
Macromolecular Chemistry and Physics. 2014. V.215. N18. P.1707-1720. DOI: 10.1002/macp.201400142 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Mar 14, 2014 |
| Accepted: | Apr 17, 2014 |
| Published online: | May 21, 2014 |
| Published print: | Sep 1, 2014 |
Identifiers:
| Web of science: | WOS:000342622800003 |
| Scopus: | 2-s2.0-84915825372 |
| Elibrary: | 24013647 |
| Chemical Abstracts: | 2014:849242 |
| Chemical Abstracts (print): | 161:629109 |
| OpenAlex: | W2051848875 |