Activated carbon fibers as a support for nickel diimine complexes and their application in ethylene oligomerization

In this work, we demonstrate the synthesis and characterization of a new class of β-diimine ligand combined with the alkoxysilane group CPTMS ((3-chloropropyl)trimethoxysilane), covalently anchored to the surface of activated carbon fibers (ACF) by interaction with the hydroxyl groups of the surface...

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Bibliographic Details
Published in:New journal of chemistry 2020-09, Vol.44 (35), p.151-1518
Main Authors: Variani, Yuri M, Lopes, Christian W, Nicola, Bruna P, Meira, Debora M, Pergher, Sibele B. C, Bernardo-Gusmão, Katia
Format: Article
Language:English
Subjects:
Activated carbon
Alkenes
Carbon fibers
Catalytic activity
Chemical analysis
Diimide
Ethylene
Hydroxyl groups
Infrared analysis
Ligands
Nickel
NMR
Nuclear magnetic resonance
Oligomerization
Precursors
Selectivity
X ray absorption
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Summary:In this work, we demonstrate the synthesis and characterization of a new class of β-diimine ligand combined with the alkoxysilane group CPTMS ((3-chloropropyl)trimethoxysilane), covalently anchored to the surface of activated carbon fibers (ACF) by interaction with the hydroxyl groups of the surface. The nickel β-diimine dibromo ( N , N -bis(2,6-diethylphenyl)-2,4-pentanedimine)nickel( ii ) complex employed in this study has an interesting catalytic activity and selectivity in producing light olefins, when applied in ethylene oligomerization reactions in a homogenous and anchored to the ACF in a heterogeneous medium. The ligand was characterized by 1 H NMR, elemental analysis and infrared, while the catalytic precursor was analyzed by infrared and X-ray absorption spectroscopy (XAS), and the activated carbon fibers (ACF) employed as a support of this catalytic precursor were analyzed by SEM, adsorption/desorption of N 2 , elemental analysis, and FAAS. The catalytic precursor is shown to be active in ethylene oligomerization reactions, with excellent selectivity (above 90%) for α-C 4 . Tests in the heterogeneous medium of the complexes, anchored to the ACF for ethylene oligomerization, demonstrated also excellent selectivity, above 95%. In this work, we demonstrate the synthesis and characterization of a new class of β-diimine ligand combined with the alkoxysilane group CPTMS ((3-chloropropyl)trimethoxysilane), covalently anchored to the surface of activated carbon fibers (ACF).
ISSN:1144-0546
1369-9261
DOI:10.1039/d0nj02285c