Article (Scientific journals)
Carbon nanotubes synthesis by the ethylene chemical catalytic vapour deposition (CCVD) process on Fe, Co, and Fe-Co/Al2O3 sol-gel catalysts
Tran, Kim Yên; Heinrichs, Benoît; Colomer, Jean-François et al.
2007In Applied Catalysis A: General, 318, p. 63-69
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Keywords :
carbon nanotubes; sol-gel; metal precursors; ethylene; chemical catalytic vapour deposition
Abstract :
[en] The production of carbon nanotubes by the chemical catalytic vapour deposition, CCVD, process was examined over iron, cobalt, and a mixture of iron and cobalt supported on alumina catalysts synthesized by a one step sol-gel process. The catalysts were synthesized from several metal precursors, iron nitrate, cobalt and iron acetylacetonate, and cobalt acetate. Ethylene was used as the carbon source. The Co/Al2O3 catalysts showed better activity and selectivity in carbon nanotubes synthesis than Fe/Al2O3 and Fe-Co/Al2O3 catalysts. The carbon deposit was found by TEM analysis to be rich in carbon nanotubes in the case of Co/Al2O3 but to be very poor in the case of the Fe-Co/Al2O3 catalysts. The catalysts were characterized by TEM, XRD, and nitrogen adsorption. It was shown that iron and cobalt are in oxide form. Metal-support interactions and metal oxide particle size are influenced by the nature of the precursor and this nature is an important factor for the activity and selectivity of the catalysts. Moreover, a correlation has been found between the metal oxide particle sizes, the diameter of the carbon nanotubes, and the catalytic activity. (c) 2006 Elsevier B.V. All rights reserved.
Disciplines :
Chemical engineering
Chemistry
Materials science & engineering
Author, co-author :
Tran, Kim Yên;  Université de Liège - ULiège > Département de Chimie appliquée > Génie chimique - Chimie physique appliquée
Heinrichs, Benoît ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
Colomer, Jean-François;  Facultés Universitaires Notre-Dame de la Paix - Namur - FUNDP > Laboratoire de Résonance Magnétique Nucléaire
Pirard, Jean-Paul ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
Lambert, Stéphanie  ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Language :
English
Title :
Carbon nanotubes synthesis by the ethylene chemical catalytic vapour deposition (CCVD) process on Fe, Co, and Fe-Co/Al2O3 sol-gel catalysts
Publication date :
20 February 2007
Journal title :
Applied Catalysis A: General
ISSN :
0926-860X
eISSN :
1873-3875
Publisher :
Elsevier Science Bv, Amsterdam, Netherlands
Volume :
318
Pages :
63-69
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
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