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Decene formation in ethylene trimerization reaction catalyzed by Cr–pyrrole system

Paper ID Volume ID Publish Year Pages File Format Full-Text
39855 45837 2014 8 PDF Available
Title
Decene formation in ethylene trimerization reaction catalyzed by Cr–pyrrole system
Abstract

•Isomeric decenes were formed in accordance with metallacyclic mechanism.•There are hexene-dependent and hexene-independent decene formation pathways.•Hexene-independent pathways seem to start before 1-hexene release from the catalyst.•The stepwise elimination mechanism is inconsistent with the product distribution.

Decene formation in the ethylene trimerization reaction was studied using a chromium(III) 2-ethylhexanoate/2,5-dimethylpyrrole/triethylaluminum/diethylaluminum chloride catalyst system. Kinetic investigations revealed that some decene formation reactions did not depend on 1-hexene concentration, because 1-hexene and catalyst may react with ethylene before dissociation of 1-hexene–catalyst complex after 1-hexene formation. The results demonstrated that decene formation is an intrinsic part of the trimerization reaction mechanism. It was also shown that a stepwise elimination mechanism for the decomposition of the chromacycloheptane intermediate cannot explain the observed product distribution. The dependencies found allow selection of appropriate conditions for low or high decene formation in the ethylene trimerization reaction.

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Keywords
Ethylene trimerization; Cr–pyrrole catalyst; Metallacyclic mechanism; Co-trimerization
First Page Preview
Decene formation in ethylene trimerization reaction catalyzed by Cr–pyrrole system
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 475, 5 April 2014, Pages 371–378
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis