A new heterogeneous catalyst for CO2 activation was identified in the Cr-II/SiO2 Phillips catalyst, one of the most important catalysts used industrially for olefin polymerization. Interestingly, it was found that Cr-II/SiO2 strongly activates CO2 already at room temperature, making it available for chemicals synthesis. A preliminary attempt in this direction was done by following the reaction of CO2 with ethylene oxide at room temperature by means of FT-IR spectroscopy, which showed the formation of ethylene carbonate. Besides non-reductive CO2 activation, Cr-II/SiO2 showed good performances in catalytic reduction of CO2 to CO, when heated under mild conditions or irradiated with UV-Vis light. Both, in situ FT-IR and UV-Vis spectroscopy, were applied to highlight the redox process occurring at the Cr centres. These results open interesting perspectives to be developed in the field of CO2 chemical fixation.

Low temperature activation and reactivity of CO2 over a Cr-II-based heterogeneous catalyst: a spectroscopic study

GROPPO, Elena Clara;ZECCHINA, Adriano;BARZAN, CATERINA;VITILLO, Jenny Grazia
2012-01-01

Abstract

A new heterogeneous catalyst for CO2 activation was identified in the Cr-II/SiO2 Phillips catalyst, one of the most important catalysts used industrially for olefin polymerization. Interestingly, it was found that Cr-II/SiO2 strongly activates CO2 already at room temperature, making it available for chemicals synthesis. A preliminary attempt in this direction was done by following the reaction of CO2 with ethylene oxide at room temperature by means of FT-IR spectroscopy, which showed the formation of ethylene carbonate. Besides non-reductive CO2 activation, Cr-II/SiO2 showed good performances in catalytic reduction of CO2 to CO, when heated under mild conditions or irradiated with UV-Vis light. Both, in situ FT-IR and UV-Vis spectroscopy, were applied to highlight the redox process occurring at the Cr centres. These results open interesting perspectives to be developed in the field of CO2 chemical fixation.
2012
14
18
6538
6543
http://pubs.rsc.org/en/Content/ArticleLanding/2012/CP/c2cp40524e
CARBON-DIOXIDE; ETHYLENE POLYMERIZATION; VIBRATIONAL PROPERTIES; OXIDATIVE ADDITION; PHILLIPS CATALYST; PROPYLENE-OXIDE; EPOXIDES; CHROMIUM; COPOLYMERIZATION
E. Groppo; A. Zecchina; C. Barzan; J. G. Vitillo
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/91111
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