Silica-Supported Zirconocene Catalysts: Preparation, Characterization and Activity in Ethylene Polymerization | Sciact - CRIS-system of Boreskov Institute of Catalysis

Silica-Supported Zirconocene Catalysts: Preparation, Characterization and Activity in Ethylene Polymerization Full article

Journal

Journal of Molecular Catalysis A: Chemical
ISSN: 1381-1169

Output data

Year: 1998, Volume: 130, Number: 1-2, Pages: 121-129 Pages count : 9 DOI: 10.1016/S1381-1169(97)00206-9

Tags

Aluminum alkyls, Ethylene, Metallocene catalysts, Methylaluminoxane, Polymerization, Silylated silica, Supported catalysts, Zirconium

Authors

Moroz Boris L. ¹ , Semikolenova Nina V. ¹ , Nosov Andrey V. ¹ , Zakharov Vladimir A. ¹ , Nagy Sandor ² , O'Reilly Neil J. ³

Affiliations

1	Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
2	Occidental Chemical Corporation, Technology Center, 2801 Long Road, Grand Island, NY 14072, USA
3	Lyondell Petrochemical Corporation, Lyondell Technology Center, FM 2917 (12 Miles South of Alvin), P.O. Box 2917, Alvin, TX 77512, USA

Supported catalysts for ethylene polymerization have been prepared by interaction of Cp2ZrX2 (Cp=η5-C5H5, X=Cl or CH3) with silica chemically modified by (CH3)3SiCl (TMCS) or trialkylaluminium compounds AlR3 (R=C2H5 (TEA) and Full-size image (<1 K)4H9 (TIBA)). The interactions between the modificators and the silica surface have been examined by Full-size image (<1 K) solid-state MAS NMR spectroscopy, DRIFTS and chemical analysis. The Cp2Zr(CH3)2/SiO2–TMCS catalyst showed a fairly high activity in ethylene polymerization (30–300 kg PE(mol Zr·h·bar)−1) even in the absence of any cocatalysts specially added. The addition of the cocatalyst (MAO or TIBA) led to a further increase in the activity of the supported catalysts. Polyethylene obtained with the Cp2Zr(CH3)2/SiO2–TMCS catalyst without any cocatalyst consisted of uniform polymer particles of a spherical shape replicating that of the silica particles, whereas the shapeless aggregates of finely dispersed polymer particles similar to those usually obtained with homogeneous systems were produced with the same supported catalyst in the presence of the MAO cocatalyst.

Moroz B.L. , Semikolenova N.V. , Nosov A.V. , Zakharov V.A. , Nagy S. , O'Reilly N.J.
Silica-Supported Zirconocene Catalysts: Preparation, Characterization and Activity in Ethylene Polymerization
Journal of Molecular Catalysis A: Chemical. 1998. V.130. N1-2. P.121-129. DOI: 10.1016/S1381-1169(97)00206-9 WOS Scopus РИНЦ ANCAN OpenAlex

Submitted:	Feb 7, 1997
Accepted:	Sep 9, 1997
Published print:	Mar 12, 1998
Published online:	Jan 25, 1999

Web of science:	WOS:000073456800013
Scopus:	2-s2.0-0032510556
Elibrary:	13280546
Chemical Abstracts:	1998:220717
Chemical Abstracts (print):	128:295082
OpenAlex:	W2017092514

DB	Citing
Web of science	44
Scopus	45
Elibrary	44
OpenAlex	41