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Influence of ionic liquid counterions on activity and selectivity of ethylene trimerization using chromium‐based catalysts in biphasic media
Author(s) -
Marefat Mohamadreza,
Ahmadi Ebrahim,
Mohamadnia Zahra
Publication year - 2020
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.5874
Subject(s) - chemistry , selectivity , catalysis , ionic liquid , counterion , substituent , ethylene , inorganic chemistry , nuclear chemistry , organic chemistry , ion
In recent years ionic liquids (ILs) have attracted much interest because of their widespread use in various fields. Several trimerization and oligomerization catalysts have been evaluated in ILs with different organic–inorganic hybrid structures. High catalytic activity and selectivity, easy product separation, and recycling of the catalyst are the advantages of a biphasic catalyst system compared to the homogeneous catalysts. In this study, the influence of IL counter‐anions on activity and selectivity of the ethylene trimerization catalysts based on Cr‐SNS‐R was investigated. All synthesized materials were characterized using Fourier‐transform infrared spectroscopy, 1 H NMR, 13 C NMR, UV–Vis. spectroscopy, thin‐layer chromatography, and elemental analysis (CHNS). In ethylene trimerization reaction, the dodecyl substituent in the SNS ligand exhibited better activity and selectivity than the butyl substituent. The results revealed that the presence of BF 4 − as a counter‐anion in the IL led to an increase in activity and selectivity compared to Br − and I − counter‐anions. It was found that the BF 4 − counter‐anion plays a conclusive role in the development of 1‐hexene activity and selectivity to a maximum amount of 71,132 g 1‐C6 /(g Cr × h) and more than 99%, respectively. Finally, the catalyst was reused thrice without losing its 1‐hexene selectivity.

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