A Flat Model Approach to Tethered Bis(imino)pyridyl Iron Ethylene Polymerization Catalysts |
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| Authors: | Wei Han Hans |
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| Institution: | Schuit Institute of Catalysis, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands |
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| Abstract: | A surface science model for a silica supported bis(imino)pyridyl iron complexes is applied to reveal the surface chemistry of these heterogeneous polymerization catalysts. The polymerization activity of these models and the molecular weight distribution of the resulting polymer are comparable to similar catalysts supported on amorphous silica. The catalyst deactivates partially during the first hour of ethylene polymerization. Based on photoelectron spectroscopy (XPS) we attribute this deactivation to iron extrusion by the aluminium alkyl activator. |
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| Keywords: | bis(imino)pyridyl iron catalyst catalyst deactivation model catalyst photoelectron spectroscopy polyethylene |
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