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Counting the number of active centers in MgCl2-supported Ziegler–Natta catalysts by quenching with 2-thiophenecarbonyl chloride and study on the initial kinetics of propylene polymerization

Paper ID Volume ID Publish Year Pages File Format Full-Text
51154 46832 2013 4 PDF Available
Title
Counting the number of active centers in MgCl2-supported Ziegler–Natta catalysts by quenching with 2-thiophenecarbonyl chloride and study on the initial kinetics of propylene polymerization
Abstract

Using 2-thiophenecarbonyl chloride (TPCC) as a quenching agent, the number of active centers in propylene polymerization with MgCl2-supported Ziegler–Natta catalysts were determined by measuring the sulfur content of the quenched polymer. Under suitable conditions, the thiophenecarbonyl-labeled polymer chains were stable in the reaction system when TPCC/Al > 1. The number of active centers was found to increase in the first 5 minutes of propylene polymerization, accompanied by rapid decrease of the propagation rate constant kp. Diffusion barrier from the polymer covering the catalyst fragments is thought as the main reason of the rapid decay of kp in the initial stage.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► 2-Thiophenecarbonyl chloride was used as quenching agent. ► Number of active center in MgCl2-supported Z-N catalyst is counted with high accuracy. ► Initial kinetics of propylene polymerization was studied with the method. ► Gradual initiation of the active centers is accompanied by rapid decrease of kp. ► Diffusion barrier from polymer covering the catalyst accounts for decrease of kp.

Keywords
Ziegler–Natta catalyst; Number of active center; 2-thiophenecarbonyl chloride; Propylene; Polymerization kinetics
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Counting the number of active centers in MgCl2-supported Ziegler–Natta catalysts by quenching with 2-thiophenecarbonyl chloride and study on the initial kinetics of propylene polymerization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 30, 5 January 2013, Pages 66–69
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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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