New Ways of Controlling the Molecular Mass Characteristics and Distribution of Branches for Polyethylene Synthesized over Supported Catalysts Containing Fe(II) Bis(imino)pyridyl and Ni(II) Bis(imine) Complexes
{"title":"New Ways of Controlling the Molecular Mass Characteristics and Distribution of Branches for Polyethylene Synthesized over Supported Catalysts Containing Fe(II) Bis(imino)pyridyl and Ni(II) Bis(imine) Complexes","authors":"M. A. Mats’ko, N. V. Semikolenova, V. A. Zakharov","doi":"10.1134/S2070050423030066","DOIUrl":null,"url":null,"abstract":"<p>Data on the ways of controlling the molecular structure of polyethylene (PE) synthesized over the supported catalysts containing Fe(II) bis(imino)pyridyl (LFeCl<sub>2</sub>) and Ni(II) bis(imine) (*LNiBr<sub>2</sub>) complexes immobilized on a silica gel modified with aluminum oxide (SiO<sub>2</sub>(Al)) are presented. Linear polyethylene with different molecular masses and a controllable molecular weight distribution (MWD) is synthesized by varying the conditions of polymerization on LFeCl<sub>2</sub>/SiO<sub>2</sub>(Al) catalysts. Ethylene homopolymerization over *LNiBr<sub>2</sub>/SiO<sub>2</sub>(Al) catalysts results in branched polyethylene with molecular mass and thermophysical characteristics close to that of low density polyethylene synthesized by ethylene copolymerization with α-olefins over supported metallocene and Ziegler type catalysts. A way for designing supported bicomponent catalysts containing LFeCl<sub>2</sub> and *LNiBr<sub>2</sub> complexes immobilized on an SiO<sub>2</sub>(Al) support for the targeted synthesis of polyethylene with a required molecular structure is proposed. Examples are given for the synthesis of linear polyethylene with a bimodal MWD on a bicomponent supported catalyst containing two different LFeCl<sub>2</sub> complexes, the synthesis of polyethylene with a controllable distribution of branches on a bicomponent catalyst prepared via the immobilization of LFeCl<sub>2</sub> and *LNiBr<sub>2</sub> complexes on a SiO<sub>2</sub>(Al) support, and the modification of a chromium oxide catalyst with LFeCl<sub>2</sub> complex for controlling the molecular mass and branch distributions in synthesized polyethylene are given.</p>","PeriodicalId":507,"journal":{"name":"Catalysis in Industry","volume":"15 3","pages":"267 - 277"},"PeriodicalIF":0.7000,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Catalysis in Industry","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.1134/S2070050423030066","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
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Abstract
Data on the ways of controlling the molecular structure of polyethylene (PE) synthesized over the supported catalysts containing Fe(II) bis(imino)pyridyl (LFeCl2) and Ni(II) bis(imine) (*LNiBr2) complexes immobilized on a silica gel modified with aluminum oxide (SiO2(Al)) are presented. Linear polyethylene with different molecular masses and a controllable molecular weight distribution (MWD) is synthesized by varying the conditions of polymerization on LFeCl2/SiO2(Al) catalysts. Ethylene homopolymerization over *LNiBr2/SiO2(Al) catalysts results in branched polyethylene with molecular mass and thermophysical characteristics close to that of low density polyethylene synthesized by ethylene copolymerization with α-olefins over supported metallocene and Ziegler type catalysts. A way for designing supported bicomponent catalysts containing LFeCl2 and *LNiBr2 complexes immobilized on an SiO2(Al) support for the targeted synthesis of polyethylene with a required molecular structure is proposed. Examples are given for the synthesis of linear polyethylene with a bimodal MWD on a bicomponent supported catalyst containing two different LFeCl2 complexes, the synthesis of polyethylene with a controllable distribution of branches on a bicomponent catalyst prepared via the immobilization of LFeCl2 and *LNiBr2 complexes on a SiO2(Al) support, and the modification of a chromium oxide catalyst with LFeCl2 complex for controlling the molecular mass and branch distributions in synthesized polyethylene are given.
期刊介绍：
The journal covers the following topical areas:
Analysis of specific industrial catalytic processes: Production and use of catalysts in branches of industry: chemical, petrochemical, oil-refining, pharmaceutical, organic synthesis, fuel-energetic industries, environment protection, biocatalysis; technology of industrial catalytic processes (generalization of practical experience, improvements, and modernization); technology of catalysts production, raw materials and equipment; control of catalysts quality; starting, reduction, passivation, discharge, storage of catalysts; catalytic reactors.Theoretical foundations of industrial catalysis and technologies: Research, studies, and concepts : search for and development of new catalysts and new types of supports, formation of active components, and mechanochemistry in catalysis; comprehensive studies of work-out catalysts and analysis of deactivation mechanisms; studies of the catalytic process at different scale levels (laboratory, pilot plant, industrial); kinetics of industrial and newly developed catalytic processes and development of kinetic models; nonlinear dynamics and nonlinear phenomena in catalysis: multiplicity of stationary states, stepwise changes in regimes, etc. Advances in catalysis: Catalysis and gas chemistry; catalysis and new energy technologies; biocatalysis; nanocatalysis; catalysis and new construction materials.History of the development of industrial catalysis.
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