期刊
CATALYSIS COMMUNICATIONS
卷 45, 期 -, 页码 79-82出版社
ELSEVIER
DOI: 10.1016/j.catcom.2013.10.041
关键词
Ethylene polymerization; Ziegler-Natta catalyst; Active centers number; Propagation rate constant; Activation energy
资金
- Russian Foundation of Basic Research [12-03-31099]
The number of active centers at ethylene polymerization over highly active supported catalyst TiCl4/MgCl2 + AlEt3 was determined at various polymerization temperatures. It was found that the increase in polymerization temperature in the range of 40-80 degrees C increases the number of active centers. The data on reversible changes in the polymerization rate with temperature in a single experiment give grounds for supposing that alteration of the number of active centers with temperature is a reversible process. The propagation rate constants and the activation energy of the propagation reaction (4.0 kcal mol(-1)) were calculated; the latter value being considerably lower than the effective activation energy of polymerization (16.5 kcal mol(-1)) due to the increase in C-p with rising temperature. (C) 2013 Elsevier B.V. All rights reserved.
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