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Mechanism of Olefin Polymerization on Supported Ziegler–Natta Catalysts Based on Data on the Number of Active Centers and Propagation Rate Constants Научная публикация

Журнал Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210
Вых. Данные Год: 2005, Том: 46, Номер: 2, Страницы: 166-176 Страниц : 11 DOI: 10.1007/s10975-005-0065-0
Ключевые слова Propylene; Active Center; Phthalate; C3H6; Diffusion Limitation
Авторы Bukatov G.D. 1 , Zakharov V.A. 1 , Barabanov A.A. 1
Организации
1 Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences

Информация о финансировании (1)

1 ExxonMobil

Реферат: The number of active centers (C g) and propagation rate constants (k g) for the polymerization of propylene and ethylene on highly active titanium-magnesium catalysts (TMCs) of different compositions at 70°C were determined using the method of 14CO inhibition of polymerization. In the polymerization of propylene on the TiCl4/D1/MgCl2-AlEt3/D2 system (D1 is dibutyl phthalate or 2,2′-diisobutyl-1,3-dimethoxypropane; D2 is a silane), the effects of D1 and D2 donors on the values of C g and k g were studied. It was found that the donors decreased the values of k g for nonstereospecific centers, had no effect on the values of k g for stereospecific centers, and increased the fraction of stereospecific centers, as well as the fraction of “sleeping” centers regardless of their stereospecificity. The rate constants of isotactic-chain transfer with C3H6, AlEt3, H2,and ZnEt2 were determined. In the polymerization of ethylene, a number of TMCs exhibited strong diffusion limitations, which manifested themselves in a dramatic decrease in the determined values of k g. It was demonstrated that diffusion limitations can be removed by decreasing the particle size and the concentration of active centers and by performing prepolymerization with propylene. The values of k g in ethylene polymerization were similar for stereospecific and nonstereospecific centers.
Библиографическая ссылка: Bukatov G.D. , Zakharov V.A. , Barabanov A.A.
Mechanism of Olefin Polymerization on Supported Ziegler–Natta Catalysts Based on Data on the Number of Active Centers and Propagation Rate Constants
Kinetics and Catalysis. 2005. V.46. N2. P.166-176. DOI: 10.1007/s10975-005-0065-0 WOS Scopus РИНЦ CAPlusCA OpenAlex
Оригинальная: Букатов Г.Д. , Захаров В.А. , Барабанов А.А.
Исследование механизма полимеризации олефинов на нанесенных катализаторах Циглера-Натта по данным о числе активных центров и константах скорости роста
Кинетика и катализ. 2005. Т.46. №2. С.180-190. RSCI РИНЦ
Даты:
Поступила в редакцию: 1 апр. 2004 г.
Опубликована в печати: 1 мар. 2005 г.
Идентификаторы БД:
Web of science: WOS:000228933000001
Scopus: 2-s2.0-18244392193
РИНЦ: 13476402
Chemical Abstracts: 2005:380945
Chemical Abstracts (print): 144:70132
OpenAlex: W2072664377
Цитирование в БД:
БД Цитирований
Web of science 40
Scopus 43
РИНЦ 40
OpenAlex 43
Альметрики: