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Current Topics in Catalysis   Volumes    Volume 3 
Abstract
Ethylene oligomerization with Ni(MeCN)6 (BF4)2 in homogeneous phase, immobilized in ionic liquids or heterogeneized in zeolite
Michèle Oberson de Souza, Roberto F. de Souza
Pages: 267 - 273
Number of pages: 7
Current Topics in Catalysis
Volume 3 

Copyright © 2002 Research Trends. All rights reserved

 

ABSTRACT 

The oligomerization of alkenes has been performed with Ni(MeCN6)(BF4)2 associated with AlEt2Cl or AlEt3 as cocatalysts under different catalytic conditions: in homogeneous phase, under biphasic conditions (immobilized in ionic liquids) or heterogeneized in zeolite. Ni(MeCN6)(BF4)2 in homogeneous phase shows high activity (TOF = 2451 h-1) and selectivity to C4 products (97%) with 30% of 1-butene under mild reaction conditions (10 bar, 50°C). Ni(MeCN6)(BF4)2 dissolved in 1-methyl-3-butyl-imidazolium chloride/AlCl3/AlEtCl2 ionic liquids catalyses ethylene dimerization with a selectivity that can attain 83% in 1-butene and Ni(MeCN6)(BF4)2 immobilized in zeolite (NaX) exhibit selectivities in 1-butene of 78 %. The behavior of the same complex [Ni(MeCN6)(BF4)2] acting under these different catalytic reaction conditions (homogeneous, biphasic and heterogeneous) is compared and discussed. The active species and the mechanism for ethylene dimerization are proposed and discussed based on concerned characterization studies.

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