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The Cr(II)/SiO 2 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)/SiO 2 system have been followed in situ by means of temperature- and...
IR spectroscopy of adsorbed probe molecules is one of the most powerful characterization techniques for the investigation of surface active sites on high surface area materials like oxides and zeolites. In the last 20 years the use of specific IR cells allowing the in situ sample activation, gas dosage and sample cooling down to liquid nitrogen temperature has remarkably improved the number and the...
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