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Title: Ethylene, propylene and ethylene oxide in situ polymerization on the Cr(II)/SiO 2 system : A temperature and pressure dependent investigation
Authors: Groppo, Elena
Estephane, Jane 
Lamberti, Carlo
Spoto, G
Zecchina, Adriano
Affiliations: Department of Chemical Engineering 
Keywords: In-situ FTIR spectroscopy
Phillips catalyst
Subjects: Polymerization
Issue Date: 2007
Part of: Catalysis today
Volume: 126
Issue: 1-2
Start page: 228
End page: 234
The Cr(II)/SiO2 system was found to be able to activate and polymerize at room temperature not only light olefins (such as ethylene and propylene), but also a cyclic molecule such as ethylene oxide, which does not contain a C–C unsaturation. The polymerization of ethylene, propylene and ethylene oxide on the Cr(II)/SiO2 system have been followed in situ by means of temperature- and pressure-resolved FTIR spectroscopy. This method allowed to "freeze" the precursors of the reaction and the intermediate species, even when their amount is low in comparison with spectator species, and in some cases to determine the initiation mechanism. Information about the energy barrier associated with the polymerization reaction (temperature at which the reaction starts) and about the kinetic of the process (time dependence of the experiment) have been obtained in the three cases.
DOI: 10.1016/j.cattod.2007.01.052
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Chemical Engineering

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