Iron, cobalt and nickel complexes bearing hyperbranched iminopyridyl ligands: Synthesis, characterization and evaluation as ethylene oligomerization catalysts

Zhang, Na; Wang, Jiaming; Huo, Hongliang; Chen, Liduo; Shi, Weiguang; Li, Cuiqin; Wang, Jun

doi:10.1016/j.ica.2017.08.047

Cited by 29 publications

(15 citation statements)

References 37 publications

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“…The formation of a coordination compound between amine groups and metal could be analyzed from this type of vibration. At low temperature, the N–H deformation band was shifted to a lower wavenumber due to the formation of a covalent coordination bond between the amine groups and nickel, which led to a stabilization of the Ni-BTPA structure . Also, a broad N–H deformation band centered at 1620 cm –1 was observed for a high nickel ratio of 0.50, which suggested the appearance of unreacted nickel after reaching the approximate saturation point, and led to the formation of a nickel agglomerate.…”

Section: Resultsmentioning

confidence: 99%

Microporous Nickel-Coordinated Aminosilica Membranes for Improved Pervaporation Performance of Methanol/Toluene Separation

Anggarini

Nagasawa

et al. 2021

ACS Appl. Mater. Interfaces

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The nickel-doped bis [3-(trimethoxysilyl) propyl] amine (BTPA) derived membrane has a microporous coordinated network that has high potential to be an ideal separation barrier for methanol-toluene azeotropic mixtures via the pervaporation process. Ni-BTPA membranes were modified by employing a nickel dopant over amine groups in mole ratios (mol/mol) that ranged from 0.125 to 0.50. The incorporation of different amounts of nickel dopant into flexible amine-rich organosilica precursors of BTPA increased the rigidity and resulted in a porous structure with a large specific surface area (increased from 2.36 up to 282 m2 g–1) and a high pore volume (from 0.024 up to 0.184 cm3 g–1). Methanol-toluene separation performance by the nickel-doped BTPA (Ni-BTPA) membranes was increased with increases in the nickel concentration. Ni-BTPA 0.50 showed separation performance that was superior to other types of membranes, along with a high-level of flux at 2.8 kg m–2 h–1 and a separation factor higher than 900 in a 10 wt % methanol feed solution at 50 °C. These results suggest that the balance between the microporosity induced by amine-nickel coordination and an excessive amount of nickel-ion facilitates high levels of flux and separation of methanol.

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Section: Resultsmentioning

confidence: 99%

Microporous Nickel-Coordinated Aminosilica Membranes for Improved Pervaporation Performance of Methanol/Toluene Separation

Anggarini

Nagasawa

et al. 2021

ACS Appl. Mater. Interfaces

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“…Paramagnetic bimetallic hyperbranched iminopyridyl nickel(II) complexes 7 were developed by Wang et al (Figure 8). 84 These complexes are active, in the presence of MAO, and produce broad Schulz−Flory distributions (C 4 −C 23 ). Increasing the alkyl chain from 2 carbons 7a to 4 carbons 7b decreases the catalytic activity due to lower solubility of the complex in the reaction media (Table 5, example given for complex 7a).…”

Section: Neutral Ligandsmentioning

confidence: 99%

Nickel Catalyzed Olefin Oligomerization and Dimerization

et al. 2020

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Brought to life more than half a century ago and successfully applied for high-value petrochemical intermediates production, nickel-catalyzed olefin oligomerization is still a very dynamic topic, with many fundamental questions to address and industrial challenges to overcome. The unique and versatile reactivity of nickel enables the oligomerization of ethylene, propylene and butenes into a wide range of oligomers that are highly sought-after in numerous fields to be controlled. Interestingly, both homogeneous and heterogeneous nickel catalysts have been scrutinized and employed to do this. This rare specificity encouraged us to interlink them in this review so as to open up opportunities for further catalyst development and innovation. An in-depth understanding of the reaction mechanisms in play is essential to being able to fine-tune the selectivity and achieve efficiency in the rational design of novel catalytic systems. This review thus provides a complete overview of the subject, compiling the main fundamental/industrial milestones and remaining challenges facing homogeneous/heterogeneous approaches as well as emerging catalytic concepts, with a focus on the last 10 years.

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“…In order to solve these two problems, developing a new co-catalyst to enhance the b-H transfer reaction by regulating its interaction with the active center is rather helpful, thus reducing the proportion of polyethylene wax as a by-product. 44 There are several ways for cocatalysts to make transition metal centers active including group alkylation transfer, [79][80][81][82] deprotonation, 83-86 cationization 87 and ligand semi-coordination 88 etc. The nature of the oligomerization of ethylene catalyzed by ironbased catalysts is the coordination polymerization of the cationic active center.…”

Section: Effect Of Cocatalyst On the Performance Of Iron-catalyzed Ethylene Selective Oligomerization Systemmentioning

confidence: 99%

“…Homogeneous iron-based catalysts have the advantages of high activity 119,120 and selectivity. 121 Furthermore, structural alterations of complexes 70,71,[77][78][79][80][81][82][83][84][85][86][87][88][89] can be easily made. However, iron complexes are sensitive to temperature, so the catalytic time of iron complexes in oligomerization reaction is relatively short.…”

Section: Loading Of Iron-catalyzed System In Ethylene Selective Oligomerizationmentioning

confidence: 99%

Research progress of iron-based catalysts for selective oligomerization of ethylene

Wang

et al. 2020

RSC Adv.

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Iron, cobalt and nickel complexes bearing hyperbranched iminopyridyl ligands: Synthesis, characterization and evaluation as ethylene oligomerization catalysts

Cited by 29 publications

References 37 publications

Microporous Nickel-Coordinated Aminosilica Membranes for Improved Pervaporation Performance of Methanol/Toluene Separation

Microporous Nickel-Coordinated Aminosilica Membranes for Improved Pervaporation Performance of Methanol/Toluene Separation

Nickel Catalyzed Olefin Oligomerization and Dimerization

Research progress of iron-based catalysts for selective oligomerization of ethylene

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