| Characteristics of Titanocene Catalyst Supported on Palygorskite for Ethylene Polymerization |
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| 作者姓名： | Xiao Wei YAN Jing Dai WANG Yi Bing SHAN Yong Rong YANG |
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| 作者单位： | Xiao Wei YAN，Jing Dai WANG，Yi Bing SHAN，Yong Rong YANG* Department of Chemical Engineering，Zhejiang University，Hangzhou 310027 |
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| 摘 要： | Due to the technical problems observed for homogeneous metallocene catalysts, such as reactor fouling and requirement for large amount of expensive methylaluminoxane (MAO) as cocatalyst, the development of supported metallocene catalysts is very important…
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| 关 键 词： | 表征 二氯二茂钛催化剂 坡缕石 乙烯聚合 刘易斯酸 聚乙烯 |
| 收稿时间： | 2005-09-19 |
Characteristics of Titanocene Catalyst Supported on Palygorskite for Ethylene Polymerization |
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| Xiao Wei YAN Jing Dai WANG Yi Bing SHAN Yong Rong YANG.Characteristics of Titanocene Catalyst Supported on Palygorskite for Ethylene Polymerization[J].Chinese Chemical Letters,2006,17(5):653-656. |
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| Authors: | Xiao Wei YAN Jing Dai WANG Yi Bing SHAN Yong Rong YANG |
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| Abstract: | A series of heterogeneous catalysts with Cp2TiCl2 supported on palygorskite were prepared and evaluated by ethylene slurry polymerizations. The so-called direct supported catalyst, for which the pretreatment of palygorskite with MAO or Al(i-Bu)3 was not necessary, gave the highest activity among these supported catalysts and could be more robust than homogeneous Cp2TiCl2. With the direct supported catalyst, no significant activity loss was observed under low Al/Ti molar ratios (Al/Ti=300) and the decay of polymerization rate was slower when compared to the other supported catalysts. It was found that the surface Lewis acidity of palygorskite after thermal treatment played an important role in activation of metallocene compound and resulted in high catalyst activity. |
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| Keywords: | Playgorskite supported catalyst ethylene polymerization Lewis acidity |
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