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应用光电子能谱对一种负载型非茂催化剂结构的表征
Characterization of Supported Non-Metallocene Catalyst with XPS
【摘要】 通过吡啶吸附红外光谱和光电子能谱对负载型非茂催化剂CpTi(dbm)Cl2的载体和催化剂的结构进行了表征,发现MgCl2/高岭土双载体表面存在大量强L酸中心;经双载体负载后的CpTi(dbm)Cl2中Ti2p的电子结合能增加了0.6~0.65eV。分析结果表明,Mg对Ti的电子效应以及载体中MAO对CpTi(dbm)Cl2的预活化作用是促使负载后活性提高的重要原因。
【Abstract】 The structures of supported CpTi(dbm)Cl2 and the supports were characterized with pyridine adsorptiondesorption IR and XPS. It was discovered that there were a lot of strong Lewis acid on the surface of the MgCl2/kaolin bisupport and the binding energy of Ti 2p in (CpTi)(dbm)Cl2 was increased by 0.60.65 eV after it was supported on the bisupport. The (analysis) result showed that both the (electron) effect of Mg on Ti and the preactivation of CpTi(dbm)Cl2 by MAO in the bisupport (contributed) a lot to the increase of activity after the catalyst was supported.
【Key words】 nonmetallocene; supported; ethylene; polymerization; catalyst; characterization;
- 【文献出处】 化工进展 ,Chemical Industry and Engineering Progress , 编辑部邮箱 ,2005年08期
- 【分类号】O643.36
- 【下载频次】111