Recent advancements in α-diimine-nickel and -palladium catalysts for ethylene polymerization

Qasim, Muhammad; Bashir, Muhammad Sohail; Iqbal, Shahid; Mahmood, Qaiser

doi:10.1016/j.eurpolymj.2021.110783

Cited by 58 publications

(40 citation statements)

References 125 publications

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“…α-Diimine Ni(II) polymerization catalysts, discovered by Brookhart and co-workers, − have remained the subject of extensive studies because of their unique ability to mediate the formation of practically important products such as highly branched polyethylene from ethylene as the only feedstock and copolymers of ethylene with polar comonomers. − …”

Section: Introductionmentioning

confidence: 99%

Ni(I) Intermediates Formed upon Activation of a Ni(II) α-Diimine Ethylene Polymerization Precatalyst with AlR₃ (R = Me, Et, and ⁱBu), AlR₂Cl (R = Me, Et), and MMAO: A Comparative Study

et al. 2022

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A variety of heterobinuclear Ni(I) complexes of the general formula [LNi I (μ-X 1 )(μ-X 2 )AlR 2 ] formed upon the activation of the [LNi II Br 2 ] (1) ethylene polymerization catalyst (L = 1,2bis [(2,6-diisopropylphenyl)imino]acenaphthene) with AlR 3 (R = Me, Et, and i Bu), AlR 2 Cl (R = Me, Et), and MMAO were detected and characterized in situ by EPR and 1 H NMR spectroscopy. The nature of the bridging groups X 1 and X 2 (X 1 , X 2 = R, Br, or Cl) depends on the nature and excess of the cocatalyst used. The catalyst systems displaying various [LNi I (μ-X 1 )(μ-X 2 )AlR 2 ] species were compared in ethylene polymerization. Possible roles of Ni(I) species in the catalytic process are discussed.

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Section: Introductionmentioning

confidence: 99%

Ni(I) Intermediates Formed upon Activation of a Ni(II) α-Diimine Ethylene Polymerization Precatalyst with AlR₃ (R = Me, Et, and ⁱBu), AlR₂Cl (R = Me, Et), and MMAO: A Comparative Study

et al. 2022

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“…As catalytic CO oxidation is an efficient method to eliminate CO pollution under low temperature conditions, it has attracted widespread research interest in recent years [ 1 , 2 ]. Among them, the supported Pt-based catalysts have been widely investigated since Langmuir’s first discovery [ 3 , 4 , 5 ]. Pt-based catalysts are critical to industrial CO oxidation because of their superior catalytic activity and stable catalytic properties [ 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

CeO2-Supported TiO2−Pt Nanorod Composites as Efficient Catalysts for CO Oxidation

et al. 2023

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Supported Pt-based catalysts have been identified as highly selective catalysts for CO oxidation, but their potential for applications has been hampered by the high cost and scarcity of Pt metals as well as aggregation problems at relatively high temperatures. In this work, nanorod structured (TiO2−Pt)/CeO2 catalysts with the addition of 0.3 at% Pt and different atomic ratios of Ti were prepared through a combined dealloying and calcination method. XRD, XPS, SEM, TEM, and STEM measurements were used to confirm the phase composition, surface morphology, and structure of synthesized samples. After calcination treatment, Pt nanoparticles were semi-inlayed on the surface of the CeO2 nanorod, and TiO2 was highly dispersed into the catalyst system, resulting in the formation of (TiO2−Pt)/CeO2 with high specific surface area and large pore volume. The unique structure can provide more reaction path and active sites for catalytic CO oxidation, thus contributing to the generation of catalysts with high catalytic activity. The outstanding catalytic performance is ascribed to the stable structure and proper TiO2 doping as well as the combined effect of Pt, TiO2, and CeO2. The research results are of importance for further development of high catalytic performance nanoporous catalytic materials.

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“…Complexes of Ni are intensively being studied as efficient catalysts for the coordination oligomerization (SHOP process and beyond [ 46 , 261 , 262 ]) and polymerization [ 5 , 263 , 264 , 265 ] of α-olefins. Ni-based polymerization catalysts are very different from early transition metal (Ti, Zr, and V) complexes due to the lower sensitivity of Ni centers to electron-donor fragments, thus providing the copolymerization of α-olefins with polar vinyl monomers [ 266 , 267 ].…”

Section: Complexes Of Nimentioning

confidence: 99%

Transition Metal–(μ-Cl)–Aluminum Bonding in α-Olefin and Diene Chemistry

2022

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Olefin and diene transformations, catalyzed by organoaluminum-activated metal complexes, are widely used in synthetic organic chemistry and form the basis of major petrochemical processes. However, the role of M–(μ-Cl)–Al bonding, being proven for certain >C=C< functionalization reactions, remains unclear and debated for essentially more important industrial processes such as oligomerization and polymerization of α-olefins and conjugated dienes. Numerous publications indirectly point at the significance of M–(μ-Cl)–Al bonding in Ziegler–Natta and related transformations, but only a few studies contain experimental or at least theoretical evidence of the involvement of M–(μ-Cl)–Al species into catalytic cycles. In the present review, we have compiled data on the formation of M–(μ-Cl)–Al complexes (M = Ti, Zr, V, Cr, Ni), their molecular structure, and reactivity towards olefins and dienes. The possible role of similar complexes in the functionalization, oligomerization and polymerization of α-olefins and dienes is discussed in the present review through the prism of the further development of Ziegler–Natta processes and beyond.

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Recent advancements in α-diimine-nickel and -palladium catalysts for ethylene polymerization

Cited by 58 publications

References 125 publications

Ni(I) Intermediates Formed upon Activation of a Ni(II) α-Diimine Ethylene Polymerization Precatalyst with AlR₃ (R = Me, Et, and ⁱBu), AlR₂Cl (R = Me, Et), and MMAO: A Comparative Study

Ni(I) Intermediates Formed upon Activation of a Ni(II) α-Diimine Ethylene Polymerization Precatalyst with AlR₃ (R = Me, Et, and ⁱBu), AlR₂Cl (R = Me, Et), and MMAO: A Comparative Study

CeO2-Supported TiO2−Pt Nanorod Composites as Efficient Catalysts for CO Oxidation

Transition Metal–(μ-Cl)–Aluminum Bonding in α-Olefin and Diene Chemistry

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Recent advancements in α-diimine-nickel and -palladium catalysts for ethylene polymerization

Cited by 58 publications

References 125 publications

Ni(I) Intermediates Formed upon Activation of a Ni(II) α-Diimine Ethylene Polymerization Precatalyst with AlR3 (R = Me, Et, and iBu), AlR2Cl (R = Me, Et), and MMAO: A Comparative Study

Ni(I) Intermediates Formed upon Activation of a Ni(II) α-Diimine Ethylene Polymerization Precatalyst with AlR3 (R = Me, Et, and iBu), AlR2Cl (R = Me, Et), and MMAO: A Comparative Study

CeO2-Supported TiO2−Pt Nanorod Composites as Efficient Catalysts for CO Oxidation

Transition Metal–(μ-Cl)–Aluminum Bonding in α-Olefin and Diene Chemistry

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Product

Resources

About

Ni(I) Intermediates Formed upon Activation of a Ni(II) α-Diimine Ethylene Polymerization Precatalyst with AlR₃ (R = Me, Et, and ⁱBu), AlR₂Cl (R = Me, Et), and MMAO: A Comparative Study

Ni(I) Intermediates Formed upon Activation of a Ni(II) α-Diimine Ethylene Polymerization Precatalyst with AlR₃ (R = Me, Et, and ⁱBu), AlR₂Cl (R = Me, Et), and MMAO: A Comparative Study