Article (Scientific journals)
Heterogenization of a cyclocarbonation catalyst: optimization and kinetic study
Léonard, Géraldine L.-M.; Belet, Artium; Grignard, Bruno et al.
2019In Catalysis Today, 334, p. 140-155
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Keywords :
supercritical carbon dioxide
Abstract :
[en] Different types of heterogeneous catalysts designed for a cyclocarbonation reaction between an epoxidized source and CO2 under supercritical conditions have been synthesized. The process implied a quaternization step where a (haloalkyl)trimethoxysilane reacted with tributylamine leading to a tributyl(trimethoxysilylalkyl)ammonium halide, with iodine and bromine as halogens. Then, a grafting step onto commercial fumed silica through condensation reaction between the silane part and Si-OH surficial groups provided the immobilized catalyst. The efficiency of grafting has been validated by liquid 1H NMR, solid 29Si NMR and TG-DSC-MS analyzes. The benchmark cyclocarbonation reaction of polyethylene glycol diglycidylether at 80 °C and 100 bar during 4 h showed that the best immobilized catalyst was tributylpropylammonium iodide (IC3Q-EH5). It has also been shown that immobilization provided -surprisingly !- better conversions than the corresponding homogeneous catalyst’s: this phenomenon has been explained through an epoxide-ring-opening activating effect thanks to Si-OH surficial groups. Furthermore, kinetic studies performed by in situ Raman spectroscopy on IC3Q-EH5 showed that temperature had a strong influence on the yield of the reaction while CO2 pressure had only a small effect. Recycling of the catalyst has also been considered, but no precise conclusions could be conducted because of the high catalyst dispersion. Finally, the addition of a fluorinated alcohol co-catalyst allowed obtaining a similar yield but at 80 °C and 55 bar during only 2,5 h with the best candidate.
Research center :
CESAM - Complex and Entangled Systems from Atoms to Materials - ULiège
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry
Materials science & engineering
Author, co-author :
Léonard, Géraldine L.-M.;  Carmeuse Research and Technology SA, Louvain-la-Neuve, Belgium
Belet, Artium ;  University of Liège (ULiège), Department of Chemical Engineering – Nanomaterials, Catalysis, Electrochemistry
Grignard, Bruno ;  University of Liège (ULiège), Complex and Entangled Systems from Atoms to Materials (CESAM), Center for Education and Research on Macromolecules (CERM)
Calberg, Cédric ;  University of Liège (ULiège), Department of Chemical Engineering – Nanomaterials, Catalysis, Electrochemistry
Gilbert, Bernard ;  University of Liège (ULiège), Department of Chemistry, Laboratory of Raman Spectroscopy
Jérôme, Christine  ;  University of Liège (ULiège), Complex and Entangled Systems from Atoms to Materials (CESAM), Center for Education and Research on Macromolecules (CERM)
Heinrichs, Benoît ;  University of Liège (ULiège), Department of Chemical Engineering – Nanomaterials, Catalysis, Electrochemistry
Language :
English
Title :
Heterogenization of a cyclocarbonation catalyst: optimization and kinetic study
Publication date :
15 August 2019
Journal title :
Catalysis Today
ISSN :
0920-5861
eISSN :
1873-4308
Publisher :
Elsevier, Amsterdam, Netherlands
Volume :
334
Pages :
140-155
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
The Walloon Region in the frame of the "CO2Green" project
Available on ORBi :
since 07 December 2018

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