Metallocene Supported on Inorganic Solid Supports: an Unfinished History

Ouros, Aline Cristiane dos; Souza, Michèle Oberson de; Pastore, Heloise O.

doi:10.5935/0103-5053.20140247

“…Since then, interest in the use of such species increased and was mainly stimulated by the advances carried out on polyolefin catalysts. As also reviewed by Pastore et al, [98] the exploitation of catalysts based on supported metallocenes makes it possible to overcome the difficulties associated with the use of homogeneous systems in industrial plants operating with heterogeneous Ziegler-Natta and Phillips catalysts. As it is well known, heterogeneous catalysts present several positive features, not only in terms of ease of handling, recycling, and possible use in various catalytic cycles, but also with regard to their reactivity and thermal stability.…”

Section: Metallocenesmentioning

confidence: 99%

The Control of the Coordination Chemistry for the Genesis of Heterogeneous Catalytically Active Sites in Oxidation Reactions**

Bisio

¹

,

Carniato

²

2022

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This Review provides a summary of the use and the role of coordination complexes as precursors for the generation of heterogeneous catalysts for oxidation reactions of interest for fine chemical synthesis. Specific attention is paid to the comprehension of phenomena explaining the formation of active sites in heterogeneous catalysts. Different families of coordination precursors are considered. For each example, a brief critical description of the synthesis, characterization, and catalytic performance is reported. Special attention is paid to the chemical environment of the first coordination sphere of the active metal centre. The catalysts obtained by heterogenization, grafting, or anchoring of homogeneous catalysts can therefore exhibit enhanced catalytic performance by merging advantages of both homogeneous and heterogeneous systems. The deposition of coordination complexes over a preformed support is indeed a conceptually versatile strategy to design novel catalysts with tuned and controlled properties.

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“…Since then, interest in the use of such species increased and was mainly stimulated by the advances carried out on polyolefin catalysts. As also reviewed by Pastore et al, [98] the exploitation of catalysts based on supported metallocenes makes it possible to overcome the difficulties associated the use of homogeneous systems in industrial plants operating with heterogeneous Ziegler-Natta and Phillips catalysts. As it is well known, heterogeneous catalysts present several positive features, not only in terms of ease of handling, recycling, and possible use in various catalytic cycles, but also with regard to their reactivity and thermal stability.…”

Section: Metallocenesmentioning

confidence: 99%

The Control of the Coordination Chemistry for the Genesis of Heterogeneous Catalytically Active Sites in Oxidation Reactions**

Bisio

¹

,

Carniato

²

2022

Angewandte Chemie

0

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This Review provides a summary of the use and the role of coordination complexes as precursors for the generation of heterogeneous catalysts for oxidation reactions of interest for fine chemical synthesis. Specific attention is paid to the comprehension of phenomena explaining the formation of active sites in heterogeneous catalysts. Different families of coordination precursors are considered. For each example, a brief critical description of the synthesis, characterization, and catalytic performance is reported. Special attention is paid to the chemical environment of the first coordination sphere of the active metal centre. The catalysts obtained by heterogenization, grafting, or anchoring of homogeneous catalysts can therefore exhibit enhanced catalytic performance by merging advantages of both homogeneous and heterogeneous systems. The deposition of coordination complexes over a preformed support is indeed a conceptually versatile strategy to design novel catalysts with tuned and controlled properties.

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“…A great deal of researches focusing on inorganic supports such as silica gel, magnesium dichloride, molecular sieves, aluminium oxide, zeolite and clays have been reported [3][4][5][6][7] for olefin polymerization. The inorganic MgCl 2 and SiO 2 have been successfully applied in the conventional Ziegler-Natta or metallocene catalysts.…”

Section: Introductionmentioning

confidence: 99%

Immobilized Polyolefin Catalysts: Organic Versus Inorganic Supports

Wang¹

2023

ACSR

0

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The polyolefins are the most widely used synthetic resin and greatly influence nearly every walks of life. About 70% polyolefin production is made from the immobilized polyolefin catalysts in gas-phase, slurry or bulk process equipment. Although the inorganic supports have been successfully industrialized, some inconvenient drawbacks calls for a new type of support to solve those problems. Porous organic polymers (POPs) have proved to be an excellent choice and have been considered as a versatile platform for the deployment of catalysts. The flexible design and synthesis approach provides POPs with high surface area and bulk density, excellent flowability, and various functionalities for desired catalysts performance. The POPs-based polyolefin catalysts obtained high polymerization activity and tailored molecule structure including molecular weight, molecular weight distribution, chemical composition distribution, stereoregularity, etc. due to the nature of the organic support.

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Metallocene Supported on Inorganic Solid Supports: an Unfinished History

Cited by 5 publications

References 0 publications

The Control of the Coordination Chemistry for the Genesis of Heterogeneous Catalytically Active Sites in Oxidation Reactions**

The Control of the Coordination Chemistry for the Genesis of Heterogeneous Catalytically Active Sites in Oxidation Reactions**

The Control of the Coordination Chemistry for the Genesis of Heterogeneous Catalytically Active Sites in Oxidation Reactions**

Immobilized Polyolefin Catalysts: Organic Versus Inorganic Supports

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