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Effect of Alkylaluminum Activators on Ethylene Trimerization Based on 2,5‐DMP/Cr(III)/TCE Catalyst System
Author(s) -
Jiang Tao,
Ji Rongxin,
Chen Hongxia,
Cao Chengang,
Mao Guoliang,
Ning Yingnan
Publication year - 2011
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201190215
Subject(s) - chemistry , ethylene , catalysis , selectivity , polymer chemistry , organic chemistry
Abstract Ethylene trimerization toward 1‐hexene catalytic system with 2,5‐dimethylpyrrole (2,5‐DMP)/Cr(III)/alkylaluminum/tetrachloroethane (TCE) was investigated. The effects of various cocatalysts on catalytic activity and product selectivity were discussed. The results showed that triethylaluminum (TEA), trimethylaluminum (TMA), tri‐ n ‐hexylaluminum (TNHA) and tri‐isobutylaluminum (TIBA) were all effective cocatalysts for ethylene trimerization toward 1‐hexene. 2,5‐DMP/Cr(III)/TEA/TCE catalytic system afforded the best results for ethylene trimerization, while reducing the level of by‐product formation. Some specific interaction modes of alkylaluminum with active Cr species in the catalytic cycle were proposed to explain the effect of cocatalyst on catalytic activity and 1‐hexene selectivity.