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Influence of Acidic Support in Metallocene Catalysts for Ethylene Polymerization

Authors
Journal
Journal of Catalysis
0021-9517
Publisher
Elsevier
Publication Date
Volume
204
Issue
1
Identifiers
DOI: 10.1006/jcat.2001.3345
Keywords
  • Zsm-5 Zeolite Support
  • Supported-Metallocene Catalyst
  • Ethylene Polymerization

Abstract

Abstract We studied a ZSM-5 zeolite as metallocene support for ethylene polymerization. We transformed the Na-ZSM-5 into H-ZSM-5. After the cation exchange, the zeolite was calcined at three different temperatures. Characterization of the material indicated that by means of the calcination procedure it is possible to produce dealuminization with an increase in extraframework aluminum (EFAL). We prepared zirconocene-supported catalysts on zeolitic supports using two preparation methods. The higher activity was observed with the zirconocene supported on ZSM-5 pretreated at 900°C. We think that the dealuminization process generates an increase in EFAL. This EFAL is responsible for the higher activity.

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