Study of energy distribution of active sites in heterogeneous Ziegler-Natta catalysts

被引：0
|
作者：
Lyudmila A. Novokshonova
Natalia Yu. Kovaleva
Yurii A. Gavrilov
Vadim G. Krasheninnikov
Ilia O. Leipunskii
Alexey N. Zhigach
Michail N. Larichev
Michail V. Chebunin
机构：
[1] Institute of Chemical Physics RAS,
[2] Institute of Energy Problems of Chemical Physics RAS,undefined
来源：
Polymer Bulletin | 1997年 / 39卷
关键词：
Catalyst Surface; Temperature Program Desorption; Thermal Destruction; Ethylene Polymerization; Olefin Polymerization;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
New method of investigation of active sites non-uniformity was developed. The method is based on mass-spectrometric study of temperature programmed desorption (TPD) products from the catalyst surface at initial stages of olefin gasphase polymerization. The conditions of polymerization allowed to obtain the short macrochains on catalyst surface. Two well-resolved intense maxima in the temperature ranges of 180–210°C and 280–320°C on the TPD curves from SiO2/TiCl4/AlEt2Cl catalyst surface after polymerization were observed in a result of thermal destruction of active Ti-C bonds and the evolution of hydrocarbon molecules of different length (up to 14 monomer units in chain). One may conclude that in this catalyst there are at least two types of active sites varying in the activation energy of thermal destruction of Ti-C bonds. The distribution of active sites over activation energy of Ti-C bond thermal destruction was calculated.
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页码：59 / 65
页数：6
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