Article (Scientific journals)
Porous carbon xerogels with texture tailored by pH control during sol-gel process
Job, Nathalie; Pirard, René; Marien, José et al.
2004In Carbon, 42 (3), p. 619-628
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Keywords :
porous carbon; catalyst support; texture; carbon xerogels
Abstract :
[en] Despite commonly accepted ideas, evaporative drying does not always completely destroy the pore texture of phenolic gel. This work shows that very porous carbon materials can be synthesized by evaporative drying and pyrolysis of aqueous resorcinol-formaldehyde gels provided that the operating variables are correctly chosen. Moreover, in this manner monoliths can be easily produced. The pore texture of the materials was studied before and after pyrolysis in order to determine which synthesis and/or pyrolysis variables have an influence on the final texture of the carbon. Results show that it is possible to tailor the morphology of these materials by varying the initial pH of the precursors solution in a narrow range. Micro-macroporous, micro-mesoporous, microporous or totally non-porous carbon materials were obtained. The specific surface area is independent from the initial pH whereas the total void volume varies from 0.4 to 1.4 cm(3)/g when the initial pH decreases from 6.25 to 5.45. These materials can be used as catalysts supports or for electrochemical applications, the texture control being an interesting advantage. (C) 2004 Elsevier Ltd. All rights reserved.
Disciplines :
Chemical engineering
Materials science & engineering
Author, co-author :
Job, Nathalie  ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie Physique Appliquée
Pirard, René ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie Physique Appliquée
Marien, José ;  Université de Liège - ULiège > Département de chimie appliquée > Chimie générale et chimie physique
Pirard, Jean-Paul ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie Physique Appliquée
Language :
English
Title :
Porous carbon xerogels with texture tailored by pH control during sol-gel process
Publication date :
2004
Journal title :
Carbon
ISSN :
0008-6223
eISSN :
1873-3891
Publisher :
Elsevier Science, Oxford, United Kingdom
Volume :
42
Issue :
3
Pages :
619-628
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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