Low temperature activation and reactivity of CO 2 over a Cr II-based heterogeneous catalyst: A spectroscopic study

Elena Groppo; Adriano Zecchina; Caterina Barzan; Jenny G. Vitillo

doi:10.1039/c2cp40524e

Low temperature activation and reactivity of CO ₂ over a Cr ^II-based heterogeneous catalyst: A spectroscopic study

Elena Groppo, Adriano Zecchina, Caterina Barzan, Jenny G. Vitillo

Chemistry (Twin Cities)

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Abstract

A new heterogeneous catalyst for CO ₂ activation was identified in the Cr ^II/SiO ₂ Phillips catalyst, one of the most important catalysts used industrially for olefin polymerization. Interestingly, it was found that Cr ^II/SiO ₂ strongly activates CO ₂ already at room temperature, making it available for chemicals synthesis. A preliminary attempt in this direction was done by following the reaction of CO ₂ with ethylene oxide at room temperature by means of FT-IR spectroscopy, which showed the formation of ethylene carbonate. Besides non-reductive CO ₂ activation, Cr ^II/SiO ₂ showed good performances in catalytic reduction of CO ₂ 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 CO ₂ chemical fixation.

Original language	English (US)
Pages (from-to)	6538-6543
Number of pages	6
Journal	Physical Chemistry Chemical Physics
Volume	14
Issue number	18
DOIs	https://doi.org/10.1039/c2cp40524e
State	Published - May 14 2012

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title = "Low temperature activation and reactivity of CO 2 over a Cr II-based heterogeneous catalyst: A spectroscopic study",

abstract = "A new heterogeneous catalyst for CO 2 activation was identified in the Cr II/SiO 2 Phillips catalyst, one of the most important catalysts used industrially for olefin polymerization. Interestingly, it was found that Cr II/SiO 2 strongly activates CO 2 already at room temperature, making it available for chemicals synthesis. A preliminary attempt in this direction was done by following the reaction of CO 2 with ethylene oxide at room temperature by means of FT-IR spectroscopy, which showed the formation of ethylene carbonate. Besides non-reductive CO 2 activation, Cr II/SiO 2 showed good performances in catalytic reduction of CO 2 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 CO 2 chemical fixation.",

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