Organosilicon-modified silicas as support for zirconocene catalyst

被引：62

作者：

dos Santos, JHZ ^{[1
]}

Greco, PP ^{[1
]}

Stedile, FC ^{[1
]}

Dupont, J ^{[1
]}

机构：

[1] UFRGS, Inst Quim, BR-91509900 Porto Alegre, RS, Brazil

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2000年 / 154卷 / 1-2期

关键词：

silica; zirconocenes; organosilanes; methylaluminoxane; polymerization;

D O I：

10.1016/S1381-1169(99)00393-3

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 metallocene (nBuCp)(2)ZrCl2 was grafted on partially dehydroxilated commercial silica (Grace 948) whose surface had been chemically modified by wet impregnation of an oganosilane (Ph3SiCl, Me3SiCl, or Me2SiHCl) aiming at supported catalyst systems with well spaced alpha-olefin polymerization active centers. Final Zr loadings were determined by Rutherford Backscattering Spectrometry (RBS), and modifications at the silica surface after each preparation step were monitored by in situ FT-IR spectroscopy. These catalyst systems produced polyethylenes with narrow molecular weight distribution when methylaluminoxane was used as cocatalyst, with twice the activity of (nBuCp)(2)ZrCl2 supported on bare SiO2. Effects of support structure and chemical modification on catalyst performance are presented and discussed. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：103 / 113

页数：11

共 49 条

[1] Syntheses of polysiloxane-supported zirconocene catalysts and application to ethene polymerization [J].

Arai, T ;

Ban, HT ;

Uozumi, T ;

Soga, K .

MACROMOLECULAR CHEMISTRY AND PHYSICS, 1997, 198 (02) :229-237

[2] REACTIONS OF ORGANOSTANNANES WITH SILICA, GAMMA-ALUMINA, AND SILICA-ALUMINA [J].

BALLIVETTKATCHENKO, D ;

DOSSANTOS, JHZ ;

MALISOVA, M .

LANGMUIR, 1993, 9 (12) :3513-3517

[3]

BELLAMY LJ, 1975, INFRARED SPECTA COMP

[4]

BONNI F, 1995, J POLYM SCI A, V33, P2393

[5]

BRINTZINGER HH, 1995, ANGEW CHEM INT EDIT, V34, P1443

[6]

CARNEY MJ, 1998, P 5 INT C MET POL MA, P121

[7] METALLOCENE METHYLALUMINOXANE CATALYSTS FOR OLEFIN POLYMERIZATION .5. COMPARISON OF CP2ZRCL2 AND CPZRCL3 [J].

CHIEN, JCW ;

WANG, BP .

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 1990, 28 (01) :15-38

[8]

CHIEN JCW, 1991, J POLYM SCI A, V29, P2603

[9] POLYMERIZATION OF PROPYLENE USING SUPPORTED, CHIRAL, ANSA-METALLOCENE CATALYSTS - PRODUCTION OF POLYPROPYLENE WITH NARROW MOLECULAR-WEIGHT DISTRIBUTIONS [J].

COLLINS, S ;

KELLY, WM ;

HOLDEN, DA .

MACROMOLECULES, 1992, 25 (06) :1780-1785

[10] The effect of silica dehydroxylation temperature on the activity of SiO2-supported zirconocene catalysts [J].

dos Santos, JHZ ;

Krug, C ;

da Rosa, MB ;

Stedile, FC ;

Dupont, J ;

Forte, MD .

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 1999, 139 (2-3) :199-207

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