Modification of the (SiO2/MgO/MgCl2)·TiCl<italic style="font-style: italic">x</italic> Ziegler-Natta Polyethylene Catalysts Using the Third Metal Elements

Ting Fu; Rui-hua Cheng; Xue-lian He; Zhen Liu; Zhou Tian; Bo-ping Liu

doi:10.1007/s10118-017-1939-0

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Modification of the (SiO₂/MgO/MgCl₂)·TiCl_x Ziegler-Natta Polyethylene Catalysts Using the Third Metal Elements

Papers | Updated：2021-02-18

- Modification of the (SiO₂/MgO/MgCl₂)·TiCl_x Ziegler-Natta Polyethylene Catalysts Using the Third Metal Elements
- Chinese Journal of Polymer Science Vol. 35, Issue 6, Pages: 739-751(2017)
- Affiliations：
  
  State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
- Author bio：
  
  Rui-hua Cheng (程瑞华), E-mail: rhcheng@ecust.edu.cn
  Bo-ping Liu (刘柏平), E-mail: boping@ecust.edu.cn
- Funds：
- DOI：10.1007/s10118-017-1939-0
  CLC：
- Received：27 October 2016，
  
  Revised：2016-11-26，
  
  Accepted：28 November 2016，
  
  Published：05 June 2017
- Accepted：
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Ting Fu, Rui-hua Cheng, Xue-lian He, et al. Modification of the (SiO₂/MgO/MgCl₂)·TiCl_x Ziegler-Natta Polyethylene Catalysts Using the Third Metal Elements[J]. Chinese Journal of Polymer Science, 2017, 35(6): 739-751. DOI: 10.1007/s10118-017-1939-0.
DOI：

Ting Fu, Rui-hua Cheng, Xue-lian He, et al. Modification of the (SiO₂/MgO/MgCl₂)·TiCl_x Ziegler-Natta Polyethylene Catalysts Using the Third Metal Elements[J]. Chinese Journal of Polymer Science, 2017, 35(6): 739-751. DOI: 10.1007/s10118-017-1939-0. DOI：

摘要

Abstract

Various (SiO

/MgO/MgCl

)·TiCl

Ziegler-Natta catalysts modified by the third metal elements were synthesized by the co-impregnation of water-soluble magnesium and the third metal salts. Several key factors including the electronegativity of the third metal elements

catalyst performances in ethylene homo-polymerization

ethylene/1-hexene copolymerization and hydrogen response were systematically investigated. Both the catalyst performance and the polymer properties are influenced by the introduction of the third metal elements. Compared with the unmodified (SiO

/MgO/MgCl

)·TiCl

Ziegler-Natta catalyst

activity and 1-hexene incorporation are enhanced by the introduction of zirconium

vanadium

aluminum and chromium

while deteriorated by the addition of ferrum

nickel

molybdenum and tungsten. Correlations of the catalyst activities and 1-hexene incorporation ability with the electronegativity of the third metal elements are discovered. It is found that the lower electronegativity of the third metal elements leads to the catalyst with higher activity and higher

-olefin co-polymerization ability. The polyethylene produced by a nickel modified catalyst showed broad molecular weight distribution (MWD) and the lowest average molecular weight (MW)

while by using a ferrum modified catalyst

the resulting polyethylene had the highest MW

reaching the ultra-high MW area. Vanadium and chromium modified catalysts demonstrated the best hydrogen response.

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⁰

Modification of the (SiO2/MgO/MgCl2)·TiClx Ziegler-Natta Polyethylene Catalysts Using the Third Metal Elements

DOI：10.1007/s10118-017-1939-0

摘要

Abstract

关键词

Keywords

references

Modification of the (SiO₂/MgO/MgCl₂)·TiCl_x Ziegler-Natta Polyethylene Catalysts Using the Third Metal Elements