[en] Carbon xerogels synthesized with a fixed resorcinol/sodium carbonate molar ratio (R/C) were physically activated using CO2. The effect of activation temperature and activation time on the final properties of the activated carbon xerogels was evaluated. The specific surface area increases from ~600 m2 g-1 to 2000 m2 g-1 and more by increasing the temperature and duration of the activation step. A comparison between physical activation with CO2 and chemical activation with hydroxides was also performed: it was found that both processes produce an increase of the micropore volume and specific surface area without altering the meso-macroporosity developed during the synthesis. However, chemical activation can lead to the development of the narrow microporosity mainly whereas, in physical activation, the widening of the narrow micropores takes place whatever the process conditions.
Disciplines :
Chemical engineering Materials science & engineering
Author, co-author :
Contreras, María S
Páez, Carlos A
Zubizarreta, Leire
Léonard, Angélique ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Procédés et développement durable
Blacher, Silvia ; Université de Liège - ULiège > Département des sciences cliniques > Labo de biologie des tumeurs et du développement
Olivera-Fuentes, Claudio G
Arenillas, Ana
Pirard, Jean-Paul ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Job, Nathalie ; Université de Liège - ULiège > Département de chimie appliquée > Département de chimie appliquée
Language :
English
Title :
A comparison of physical activation of carbon xerogels with carbon dioxide with chemical activation using hydroxides
Publication date :
September 2010
Journal title :
Carbon
ISSN :
0008-6223
eISSN :
1873-3891
Publisher :
Elsevier Science, Oxford, United Kingdom
Volume :
48
Issue :
11
Pages :
3157-3168
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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