{"title":"控制含 Fe(II) 双(亚氨基)吡啶和 Ni(II) 双(亚胺)络合物的支撑催化剂合成聚乙烯的分子质量特征和支链分布的新方法","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":"{\"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}","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}
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
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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