Korean Journal of Chemical Engineering

, Volume 35, Issue 4, pp 1026–1032 | Cite as

Effect of MAO-modified nanoporous silica supports with single-site titanocene catalyst on ethylene polymerization

  • Farideh Azimfar
  • Alireza Badiei
  • Seyed Mehdi Ghafelebashi
  • Majid Daftari-Besheli
  • Abbas Rezaee Shirin-Abadi
Polymer, Industrial Chemistry
  • 26 Downloads

Abstract

Three types of nanoporous silica support were modified by methylaluminoxane MAO and characterized by using BET, SEM, XRD and TGA. Dimethylsilyl (N-tert-butylamido)(tetramethylcyclopentadienyl) titanium dichlride was synthesized and immobilized on modified support. The prepared complex was then used as a reactive catalyst for ethylene polymerization. The effect of immobilization conditions on catalyst performance was studied. The results revealed elevated temperature grafting, decrease in precatalyst loading. Also, increasing of immobilization reaction time showed an increase in activity to 130 Kg poly/mol Ti.h.bar. The effects of polymerization temperature and [Al]/[Ti] ratio on the catalyst behavior, namely activity and bulk density, were investigated. According to the results, the activity of single-site catalyst depends on condition of immobilization and structure of nanoporous silica support.

Keywords

Nanoporous Silica Titanocene Immobilization Polymerization Polyethylene (PE) 

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Copyright information

© Korean Institute of Chemical Engineers, Seoul, Korea 2018

Authors and Affiliations

  • Farideh Azimfar
    • 1
  • Alireza Badiei
    • 2
  • Seyed Mehdi Ghafelebashi
    • 3
  • Majid Daftari-Besheli
    • 3
  • Abbas Rezaee Shirin-Abadi
    • 4
  1. 1.School of Chemistry, Alborz CampusUniversity of TehranTehranIran
  2. 2.School of Chemistry, College of ScienceUniversity of TehranTehranIran
  3. 3.National Petrochemical CompanyPetrochemical Research and Technology CompanyTehranIran
  4. 4.Faculty of Chemistry & Petroleum Sciences, Department of Polymer & Materials ChemistryShahid Beheshti University, G.C.TehranIran

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