Ethylene polymerization of nickel catalysts with α-diimine ligands: factors controlling the structure of active species and polymer properties

2019 ◽  
Vol 48 (23) ◽  
pp. 7974-7984 ◽  
Author(s):  
Igor E. Soshnikov ◽  
Konstantin P. Bryliakov ◽  
Artem A. Antonov ◽  
Wen-Hua Sun ◽  
Evgenii P. Talsi
Keyword(s):  
Ethylene Polymerization ◽  
Catalytic Properties ◽  
Nickel Catalysts ◽  
Active Species ◽  
Diimine Ligands ◽  
Recent Advances ◽  
Polymer Properties

In the present perspective, the recent advances of α-diimine nickel based catalysts of ethylene polymerization, focusing on the relationships between catalyst structures and their catalytic properties are discussed.

scholarly journals α-Diimine Ni-Catalyzed Ethylene Polymerizations: On the Role of Nickel(I) Intermediates

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1386
Author(s):  
Igor E. Soshnikov ◽  
Nina V. Semikolenova ◽  
Konstantin P. Bryliakov ◽  
Evgenii P. Talsi
Keyword(s):  
Ethylene Polymerization ◽  
Active Sites ◽  
Rational Design ◽  
Catalytic Properties ◽  
Broad Class ◽  
Polymerization Process ◽  
Diimine Ligands ◽  
Catalyst Systems ◽  
Monovalent Nickel

Nickel(II) complexes with bidentate N,N-α-diimine ligands constitute a broad class of promising catalysts for the synthesis of branched polyethylenes via ethylene homopolymerization. Despite extensive studies devoted to the rational design of new Ni(II) α-diimines with desired catalytic properties, the polymerization mechanism has not been fully rationalized. In contrast to the well-characterized cationic Ni(II) active sites of ethylene polymerization and their precursors, the structure and role of Ni(I) species in the polymerization process continues to be a “black box”. This perspective discusses recent advances in the understanding of the nature and role of monovalent nickel complexes formed in Ni(II) α-diimine-based ethylene polymerization catalyst systems.

Active O,Npy,N-Titanium(IV) Fluoride Precatalysts for Ethylene Polymerization: Exploring “Fluoride Effects” on Polymer Properties and Catalytic Performance

2016 ◽  
Vol 35 (9) ◽  
pp. 1183-1191 ◽  
Author(s):  
Luka A. Wright ◽  
Eric G. Hope ◽  
Gregory A. Solan ◽  
Warren B. Cross ◽  
Kuldip Singh
Keyword(s):  
Ethylene Polymerization ◽  
Catalytic Performance ◽  
Polymer Properties

Remote dibenzocycloheptyl substitution on a bis(arylimino)pyridyl-iron ethylene polymerization catalyst; enhanced thermal stability and unexpected effects on polymer properties

2021 ◽  
Author(s):  
Liwei Guo ◽  
Wenjuan Zhang ◽  
Furong Cao ◽  
Youshu Jiang ◽  
Randi Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ethylene Polymerization ◽  
Chloride Complexes ◽  
Polymerization Catalyst ◽  
Polymer Properties

Four examples of para-dibenzocycloheptyl-substituted 2,6-bis(arylimino)pyridyl-iron(II) chloride complexes, [2,6-{(2-R1,4-(C15H13),6-R2C6H2)N=CMe}2C5H3N]FeCl2 (R1 = R2 = Me Fe1, Et Fe2, iPr Fe3, R1 = Me, R2 = Et Fe4), have been synthesized and characterized...

scholarly journals Most Recent Advances in Diesel Engine Catalytic Soot Abatement: Structured Catalysts and Alternative Approaches

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 745 ◽  
Author(s):  
Eugenio Meloni ◽  
Vincenzo Palma
Keyword(s):  
Diesel Engine ◽  
Solid Phase ◽  
Chemical Compounds ◽  
Active Species ◽  
Wire Mesh ◽  
Engine Emissions ◽  
Structured Catalysts ◽  
Geometric Configurations ◽  
Recent Advances ◽  
Alternative Approaches

Diesel engine emissions are typically composed of several hundred chemical compounds, partly present in the gas phase and partly in solid phase as particles, the so-called particulate matter or soot. The morphology of the catalyst is an important characteristic of soot particles’ abatement, since a good contact between catalyst and soot is mandatory. For practical purposes, the active species should be supported as a film on the structured carrier, in order to allow simultaneous soot filtration and combustion. This review focuses on the most recent advances in the development of structured catalysts for diesel engine catalytic soot combustion, characterized by different active species and supports, as well as by different geometric configurations (monoliths, foams, ceramic papers, or wire mesh); the most important peculiar properties are highlighted and summarized. Moreover, a critical review of the most recent advances in modeling studies is also presented in this paper. In addition, some highlights on some of the most recent alternative approaches proposed for limiting the soot emissions from diesel engines have been given, delineating feasible alternatives to the classical strategies nowadays used.

Systematic studies on dibenzhydryl and pentiptycenyl substituted pyridine-imine nickel(ii) mediated ethylene polymerization

2020 ◽  
Vol 49 (15) ◽  
pp. 4824-4833 ◽  
Author(s):  
Chaoqun Wang ◽  
Yuxing Zhang ◽  
Hongliang Mu ◽  
Zhongbao Jian
Keyword(s):  
Molecular Weight ◽  
Ethylene Polymerization ◽  
Nickel Catalysts ◽  
Low Molecular Weight

Pyridine-imine nickel catalysts bearing different N-aryl/imine substituents were systematically studied for ethylene polymerization to produce low-molecular-weight and branched polyethylenes.

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