Supported SiO2-nBuSnCl3/MAO/(nBuCp)2ZrCl2 catalyzing MAO cocatalyst-free ethylene polymerization:: Study of hydrogen responsiveness

被引：11
作者：
Atiqullah, M. [1 ]
Moman, A. A.
Akhtar, M. N.
Al-Muallem, H. A.
Abu-Raqabah, A. H.
Ahmed, Neaz
机构：
[1] King Fahd Univ Petr & Minerals, Res Inst, Ctr Refining & Petrchem, Dhahran 31261, Saudi Arabia
[2] Saudi Basic Ind Corp, R & T Ctr, Riyadh 11551, Saudi Arabia
[3] King Fahd Univ Petr & Minerals, Dept Chem, Dhahran 31261, Saudi Arabia
来源：
JOURNAL OF APPLIED POLYMER SCIENCE | 2007年 / 106卷 / 05期
关键词：
supported zirconocene catalysts; silica functionalization; replication phenomenon; hydrogen responsiveness; particle size distribution; bulk density;
D O I：
10.1002/app.26702
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
A supported metallocene catalyst was synthesized by sequentially loading methylaluminoxane (MAO) (30 wt % in toluene) and ((BuCp)-Bu-n)(2)ZrCl2 on partially dehydroxylated silica ES 70 modified by (BuSnCl3)-Bu-n. Its shock load hydrogen responsiveness was evaluated by polymerizing ethylene for I h at 8.5 bar (g) and 75 degrees C without separately feeding the MAO cocatalyst. The shock load hydrogen feeding increased the ethylene consumption (at a fairly constant rate), catalyst productivity, as well as the resin bulk density and average particle size at Delta P (of hydrogen) >=similar to 3.0 psi. The bulk density increased from 0.25 to 0.31 g/cm(3). This shows a procedure for overcoming the inherent drop in catalyst productivity caused by heterogenization. of metallocenes (that is a method for catalyst activation) and improving the resulting resin bulk density. The volume-weighted
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页码：3149 / 3157
页数：9
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