High catalytic activity of SBA-15-supported metallocene toward ethylene polymerization: The effect of the ordered porous structure of the support

被引：25
|
作者：
Covarrubias, Cristian [1 ]
Quijada, Raul [1 ,2 ]
机构：
[1] Univ Chile, Ctr Adv Interdisciplinary Res Mat CIMAT, Santiago, Chile
[2] Univ Chile, Fac Ciencias Fis & Matemat, Dept Ingn Quim & Biotecnol, Santiago, Chile
来源：
CATALYSIS COMMUNICATIONS | 2009年 / 10卷 / 06期
关键词：
Ethylene polymerization; Metallocene supports; SBA-15 mesoporous silica; NANO-POLYETHYLENE FIBERS; MESOPOROUS SILICA; COPOLYMER; TRIBLOCK;
D O I：
10.1016/j.catcom.2008.12.046
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The catalytic activity of the (nBUCP)(2)ZrCl2 metallocene Supported on ordered SBA-15 mesoporous silica and on traditional amorphous silica toward the polymerization of ethylene is Studied. High activity values were obtained with the SBA-15-supported catalyst (6953-8407 kg mol(-1) Zr bar(-1) h(-1)), which were significantly higher than those presented by the catalyst supported on amorphous silica (959-4234 kg mol(-1) Zr bar(-1) h(-1)). The highly ordered mesoporous structure of SBA-15 affords a more homogeneous distribution of the metallocene on the Support Surface and improves accessibility during metallocene activation and monomer insertion. Polyethylene (PE) synthesized with the SBA-15-supported catalyst retains the molecular weight distribution of the PE produced with the single-site homogeneous metallocene, making the SBA-15-supported catalyst a promising heterogeneous metallocene system. (C) 2008 Elsevier B.V. All rights reserved,
引用
收藏
页码：995 / 1001
页数：7
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