Formation of Isolated Titanium(III) Ions as Active Sites of Supported Titanium-Magnesium Catalysts for Polymerization of Olefins | Sciact - CRIS-система Института катализа

Formation of Isolated Titanium(III) Ions as Active Sites of Supported Titanium-Magnesium Catalysts for Polymerization of Olefins Научная публикация

Журнал

Macromolecular Chemistry and Physics
ISSN: 1022-1352 , E-ISSN: 1521-3935

Вых. Данные

Год: 2014, Том: 215, Номер: 18, Страницы: 1707-1720 Страниц : 14 DOI: 10.1002/macp.201400142

Ключевые слова

catalysts, polyethylene, polypropylene, Ziegler-Natta polymerization

Авторы

Mikenas Tatiana B. ¹ , Koshevoy Evgeny I. ¹ , Zakharov Vladimir A. ^1,2 , Nikolaeva Marina I. ¹

Организации

1	The Laboratory of Catalytic Polymerization, Boreskov Institute of Catalysis Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090, Russia
2	Chemistry Department, Novosibirsk State University, St. Pirogova 2, Novosibirsk 630090, Russia

Информация о финансировании (1)

Министерство образования и науки Российской Федерации

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.

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 CAPlusCA OpenAlex

Поступила в редакцию:	14 мар. 2014 г.
Принята к публикации:	17 апр. 2014 г.
Опубликована online:	21 мая 2014 г.
Опубликована в печати:	1 сент. 2014 г.

Web of science:	WOS:000342622800003
Scopus:	2-s2.0-84915825372
РИНЦ:	24013647
Chemical Abstracts:	2014:849242
Chemical Abstracts (print):	161:629109
OpenAlex:	W2051848875

БД	Цитирований
Web of science	23
Scopus	26
РИНЦ	25
OpenAlex	25