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Large-Scale Oxidation of Multi-Walled Carbon Nanotubes in Fluidized Bed from Ozone-Containing Gas Mixtures

Lassègue, Pierre and Noé, Laure and Dupin, Jean-Charles and Monthioux, Marc and Caussat, Brigitte Large-Scale Oxidation of Multi-Walled Carbon Nanotubes in Fluidized Bed from Ozone-Containing Gas Mixtures. (2018) The Canadian Journal of Chemical Engineering, 96 (3). 688-695. ISSN 0008-4034

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Official URL: https://doi.org/10.1002/cjce.23033

Abstract

100 g of multi-walled carbon nanotubes (MWCNTs) tangled in balls of 388 microns in Sauter diameter were treated per run in a pre-industrial scale fluidized bed reactor, using ozone-based gaseous mixtures at ambient temperature. The influence of ozone concentration and of the addition of water vapour was studied, for treatment durations between 1 h and 20 h. The process behavior was analyzed in terms of fluidized bed pressure drop and temperature profile. The nature and amount of the grafted oxygen based functions were analyzed, as the structural modifications created. An oxidation mechanism in two steps was evidenced, showing the grafting of hydroxyl, phenol and ether functions in a first step and then of lactone, quinone, carbonyl and carboxylic groups. A moderate etching of the MWCNT outer walls was observed. The amount of grafted functions and of structural defects increased with treatment duration and was highly exalted by the presence of water vapour. All the results obtained showed that the oxidation was uniform on the whole powder of the bed and from the outer part to the center of the balls, probably thanks to the high fluidization quality maintained all along the ozone treatment.

Item Type:Article
Additional Information:Thanks to Wiley editor. The original PDF of the article can be found at The Canadian Journal of Chemical Engineering website : http://onlinelibrary.wiley.com/doi/10.1002/cjce.23033/abstract
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Pau et des Pays de l'Adour - UPPA (FRANCE)
Laboratory name:
Funders:
Midi-Pyrénées region - French Waspe (Weight Saving for Aerospace Packaging Equipments)
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Deposited By: Brigitte CAUSSAT-BONNANS
Deposited On:14 Feb 2018 12:47

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