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In Situ and Ex Situ Microscopic Study of Propylene Polymerization With Heterogeneous Mgcl2-Supported Ziegler-Natta Catalysts

Published online by Cambridge University Press:  02 July 2020

V. Oleshko ,
P. Crozier ,
R. Cantrell  and
A. Westwood
V. Oleshko
Affiliation:
Center for Solid State Science, Arizona State University, Tempe, AZ85287-1704, USA.
P. Crozier
Affiliation:
Center for Solid State Science, Arizona State University, Tempe, AZ85287-1704, USA.
R. Cantrell
Affiliation:
Polypropylene Catalyst R&D, Unipol, ®Systems Department, Union Carbide Corporation, Westhollow Tech. Ctr., PO Box 4685, Houston, TX77210USA.
A. Westwood
Affiliation:
Analytical Technology Section, R&D, Union Carbide Corporation, PO Box 670, Bound Brook, NJ08805USA.
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Extract

The large-scale commercial production of polyolefins by catalytic Ziegler-Natta polymerization have stimulated the development of the third, fourth and fifth generation heterogeneous catalysts comprising high surface area defective MgCl2 with TiCl4, electron donors, and AlR3-co-catalysts. In spite of intensive research over the years, the present level of understanding of the catalysts is still incomplete because of their complex composition leading to a multitude of local active site environments. The aim of this work is to provide a new insight into the process via in situ video microscopy of gas phase propylene polymerization over MgCl2-supported Ziegler-Natta catalysts combined with ex situ characterization by light and electron microscopy techniques (SEM, TEM, HRTEM, STEM, PEELS and windowless EDX). Procedures for catalyst synthesis are described elsewhere. The catalysts were stored in a dry box under a He atmosphere (<lppm H2O/O2). Samples were transferred to specimen holders in the dry box and then transferred into the microscopes under high purge N2 conditions to prevent poisoning of the catalysts by air and moisture.

Type
Sir John Meurig Thomas Symposium: Microscopy and Microanalysis in the Chemical Sciences
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 33 - 34
Copyright
Copyright © Microscopy Society of America

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References

1. This work was supported by Union Carbide Corporation and the Industrial Associates Program of ASU.Google Scholar
2.Brady, R.C., Stakem, F.G., Liu, H.T. and Noshay, A., US Patent 5 093 415 (1992), to Union Carbide Corporation.Google Scholar
3.Oleshko, V., Crozier, P., Cantrell, R. and Westwood, A., Proc. 12th. Intern. Congr. Catal., Granada, Spain, July 9-14, 2000 (in press).Google Scholar