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Received June 21, 2017
Accepted December 3, 2017
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Effect of MAO-modified nanoporous silica supports with single-site titanocene catalyst on ethylene polymerization
Farideh Azimfar
Alireza Badiei1†
Seyed Mehdi Ghafelebashi2
Majid Daftari-Besheli2
Abbas Rezaee Shirin-Abadi3
School of Chemistry, Alborz Campus, University of Tehran, Tehran, Iran 1School of Chemistry, College of Science, University of Tehran, Tehran, Iran 2National Petrochemical Company, Petrochemical Research and Technology Company, P. O. Box 1435884711, Tehran, Iran 3Faculty of Chemistry & Petroleum Sciences, Department of Polymer & Materials Chemistry, Shahid Beheshti University, G.C., 1983969411 Tehran, Iran
Korean Journal of Chemical Engineering, April 2018, 35(4), 1026-1032(7), 10.1007/s11814-017-0337-1
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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.
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