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Ethylene polymerization using dealuminated ZSM-2 zeolite nanocrystals as an active metallocene catalyst support

Paper ID Volume ID Publish Year Pages File Format Full-Text
42916 45946 2008 11 PDF Available
Title
Ethylene polymerization using dealuminated ZSM-2 zeolite nanocrystals as an active metallocene catalyst support
Abstract

The preparation of dealuminated (DEAL) ZSM-2 zeolite nanocrystals for use as an active metallocene polymerization catalyst support is presented. The DEAL-ZSM-2 zeolite form was prepared by using steam treatment; metallocene catalyst was directly supported on the zeolite; and evaluated in the polymerization of ethylene using either methylaluminoxane (MAO) or an alkylaluminun as cocatalysts. In order to elucidate the activator effect of the acidic zeolite support, a detailed material characterization was performed.Metallocene catalyst supported on DEAL-ZSM-2 zeolite exhibited high activity values. The metallocene activation is attributed to the action of soluble cocatalyst (MAO or alkylaluminun) into the reactor and to the activator effect of extraframework aluminum species with strong Lewis acidity existing in the DEAL-ZSM-2 zeolite structure. High external surface area of the nanosized zeolite also contributes to reduce the diffusion effects commonly observed in microsized zeolite supports. The results of this work demonstrate that DEAL-ZSM-2 zeolite support does not necessitate to be treated with MAO previous fixation of the metallocene catalyst, and that polymerization activity can be also achieved using a trialkyaluminum as cocatalyst. Thus, the use of DEAL-ZSM-2 zeolite as metallocene support could contribute to reduce the amount of MAO required for ethylene polymerization.

Graphical abstractMetallocene catalyst supported on dealuminated (DEAL) nanosized ZSM-2 zeolite exhibited high ethylene polymerization activity. Metallocene activation is attributed to the action of soluble cocatalyst (MAO or alkylaluminun) in the reactor and to the activator effect of zeolite extraframework aluminum species with strong Lewis acidity. DEAL-ZSM-2 zeolite-supported catalysts can reduce the amount of MAO required for ethylene polymerization. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Ethylene polymerization; Metallocene supports; Metallocene activation; Nanosized zeolites
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Ethylene polymerization using dealuminated ZSM-2 zeolite nanocrystals as an active metallocene catalyst support
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 347, Issue 2, 15 September 2008, Pages 223–233
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us