Characterization of Carbon Anode Protected by Low Boron Level: An Attempt To Understand Carbon–Boron Inhibitor Mechanism

Ishak, Ramzi; Laroche, Gaétan; Lamonier, Jean-Francois; Ziegler, Donald P.; Alamdari, Houshang

Type de document :

Article dans une revue scientifique: Article original

DOI :

10.1021/acssuschemeng.7b00945

URL permanente :

http://hdl.handle.net/20.500.12210/12638

Titre :

Characterization of Carbon Anode Protected by Low Boron Level: An Attempt To Understand Carbon–Boron Inhibitor Mechanism

Auteur(s) :

Ishak, Ramzi [Auteur]
Natural Sciences and Engineering Research Council of Canada - NSERC (CANADA)
Laroche, Gaétan [Auteur]
Lamonier, Jean-Francois [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Ziegler, Donald P. [Auteur]
Alamdari, Houshang [Auteur]
Natural Sciences and Engineering Research Council of Canada - NSERC (CANADA)

Titre de la revue :

ACS Sustainable Chemistry & Engineering

Nom court de la revue :

ACS Sustainable Chem. Eng.

Numéro :

Pagination :

6700-6706

Éditeur :

ACS

Date de publication :

2017-07-09

Mot(s)-clé(s) en anglais :

Air reactivity
Carbon anode
Impregnation
Boron oxide
ToF-SIMS
Carbon gasification
Aluminum production

Discipline(s) HAL :

Chimie/Catalyse

Résumé en anglais : [en]

Several chemical reactions occur during the electrolysis of alumina in the Hall–Héroult process resulting in a significant overconsumption of the carbon anode. Carbon oxidation with oxygen is one of these reactions. The ...
Lire la suite >Several chemical reactions occur during the electrolysis of alumina in the Hall–Héroult process resulting in a significant overconsumption of the carbon anode. Carbon oxidation with oxygen is one of these reactions. The inhibition of this reaction by the application of protective layers on the anode can be an effective technique to reduce carbon consumption. Boron impregnation was shown to suppress this reaction. In this study, very low boron content has been impregnated on the anode, and several characterization methods have been performed to understand the protection mechanism of such a low boron concentration during the oxidation reaction of anodes. An air reactivity test of boron-impregnated anodes has been performed at temperatures between 400 and 600 °C. The samples were characterized using XPS, Raman spectroscopy, XRD, XRF, porosimetry, and thermogravimetric analysis (TGA). TGA revealed that the total number of interactions between oxygen atoms and carbon active sites was reduced, decreasing the pre-exponential factor. Time-of-flight secondary ion mass spectroscopy (ToF-SIMS) has been employed as a highly sensitive surface characterization method to identify chemical forms of boron on the anode. It has been confirmed that boron blocks active sites of carbon by creating boron–carbon bonds, thus reducing the interaction of carbon active sites with oxygen.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

ENSCL
CNRS
Centrale Lille
Univ. Artois
Université de Lille

Collections :

Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Équipe(s) de recherche :

Remédiation et matériaux catalytiques (REMCAT)

Date de dépôt :

2019-09-25T14:05:37Z
2021-03-29T14:21:07Z

Fichiers

ishak-et-al-2017-characterization-of-carbon-anode-protected-by-low-boron-level-an-attempt-to-understand-carbon-boron.pdf
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Historique des modifications

Numéro de version	Lien	Date de modification
3	20.500.12210/12638	2023-11-28T15:51:47Z
2	20.500.12210/12638.2*	2021-03-29T13:40:28Z
1	20.500.12210/12638.1	2019-09-25T14:05:37Z

*Version sélectionnée

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Characterization of Carbon Anode Protected ...

BibTeX

CSV

Excel

RIS