Polymerization of Ethylene over $Cp_2ZrCl_2$ Catalyst Supported on Montmorillonite

Montmorillonite에 담지된 $Cp_2ZrCl_2$ 촉매를 이용한 에틸렌 중합특성 연구

  • Ahn, Sung-Hyun (Research Center for Environment Resources & Processes, Korea Research Institute of Chemical Technology) ;
  • Lee, Sung-Ho (Department of Chemical Engineering, Hanyang University) ;
  • Choi, Moo-Seok (Department of Chemical Engineering, Hanyang University) ;
  • Im, Jun-Seop (Department of Chemical Engineering, Hanyang University) ;
  • Sheikh, Rizwan (Department of Chemical Engineering, Hanyang University) ;
  • Cho, Deug-Hee (Research Center for Environment Resources & Processes, Korea Research Institute of Chemical Technology) ;
  • Park, Yeung-Ho (Department of Chemical Engineering, Hanyang University)
  • 안성현 (한국화학연구원 환경자원공정연구센터) ;
  • 이성호 (한양대학교 화학공학과) ;
  • 최무석 (한양대학교 화학공학과) ;
  • 임준섭 (한양대학교 화학공학과) ;
  • ;
  • 조득희 (한국화학연구원 환경자원공정연구센터) ;
  • 박융호 (한양대학교 화학공학과)
  • Published : 2013.02.10

Abstract

Heterogeneous metallocene catalysts supported on montmorillonite (MMT), [$Cp_2ZrCl_2$/MMT, $Cp_2ZrCl_2$/MAO/MMT, and $Cp_2ZrCl_2$ + MAO/MMT], were prepared with three different methods of immobilization and tested for ethylene polymerization. The heterogeneous catalysts immobilized on organo clay (30B-MMT) showed the higher metal loading and polymerization activity than those immobilized on natural clay $Na^+-MMT$. These results suggest that the hydroxyl groups of organo clay interlayers react with the MAO and catalyst through the chemical bond. The metallocene catalyst supported directly on MMT showed lower activity for ethylene polymerization compared to the homogeneous systems, while MMT/MAO/$Cp_2ZrCl_2$, catalysts treated with MAO before impregnation, showed a higher activity. The polymers obtained from MMT-supported catalysts have higher melting point, molecular weight and molecular weight distributions than those of homogeneous catalysts. The polymer particles with increasing significant size. Ethylene polymerization over 30B-MMT/MAO/$Cp_2ZrCl_2$ catalyst was also performed varying the process variables to optimize the process conditions.

Keywords

metallocene catalyst;montmorillonite;ethylene polymerization;$Cp_2ZrCl_2$;immobilization method

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