On the chemical fixation of supercritical carbon dioxide with epoxides catalyzed by ionic salts: an in situ FTIR and Raman study

A series of ionic salts have been investigated to catalyze the coupling reaction between epoxide and carbon dioxide at T= 80 degree C and P= 8 MPa. Among them, we focused particularly on tetrabutylammonium, imidazolium and guanidinium salts. The kinetics of the synthesis was monitored in situusing b...

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Bibliographic Details
Published in:Catalysis science & technology 2013-01, Vol.3 (4), p.1046-1055
Main Authors: Foltran, Stéphanie, Alsarraf, Jérôme, Robert, Frédéric, Landais, Yannick, Cloutet, Eric, Cramail, Henri, Tassaing, Thierry
Format: Article
Language:English
Subjects:
Carbon dioxide
Catalysts
Chemical Sciences
Conversion
Iodides
Ionic liquids
Low pressure
Polymers
Screening
Synthesis
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Summary:A series of ionic salts have been investigated to catalyze the coupling reaction between epoxide and carbon dioxide at T= 80 degree C and P= 8 MPa. Among them, we focused particularly on tetrabutylammonium, imidazolium and guanidinium salts. The kinetics of the synthesis was monitored in situusing both FTIR and Raman spectroscopy. For a given reaction time, the best yields were obtained with 1,5,7-triaza-bicyclo[4.4.0]dec-5-enium bromide (TBD.HBr) and 1-methyl-3-methylimidazolium iodide (MMImI) and both have not been investigated in detail in the literature before. Thanks to this catalyst screening, we have verified how some functional groups of the catalyst can activate the epoxide and the CO sub(2) molecule enabling us to go further in the mechanism comprehension of this reaction. Due to its easier and less expensive synthesis than other ionic liquids, we focused more particularly on TBD.HBr that also offers a good conversion rate even at low pressure (80 degree C and 1 MPa).
ISSN:2044-4753
2044-4761
DOI:10.1039/c2cy20784b