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Effects of alumina phases and process parameters on the multiwalled carbon nanotubes growth

被引：23
作者：
Ciambelli, Paolo
Sannino, Diana
Sarno, Maria
Leone, Caterina
Lafont, Ugo
机构：
[1] Univ Salerno, Dept Chem & Food Engn, I-84084 Fisciano, SA, Italy
[2] DelftChemTech, Natl Ctr HREM, NL-2628 BL Delft, Netherlands
来源：
DIAMOND AND RELATED MATERIALS | 2007年 / 16卷 / 4-7期
关键词：
carbon nanotubes; catalytic chemical vapour deposition; aluminium hydroxides; CCVD; CATALYSTS; ZEOLITE; CO;
D O I：
10.1016/j.diamond.2007.01.007
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Multiwall carbon nanotubes (MWNT) growth was performed at 700 degrees C by catalytic chemical vapour deposition (CCVD) with ethylene as carbon feedstock gas. Different aluminium hydroxides such as gibbsite, boehmite, bayerite were used as Co and Fe supports. The influence of time, gas volume/catalyst mass ratio and catalyst preparation on the carbon nanotubes (CNT) growth was investigated. We have found that both the drying time before the synthesis and the aging time affect the catalyst activity. Very high carbon and reaction yields have been obtained with gibbsite and bayerite. CNT selectivity evaluated by thermogravimetric and Raman analysis depends both on support and operating conditions, reaching very high values with bayerite and gibbsite. CNT bundles grown on gibbsite and bayerite show coiled ends, suggesting a different catalyst deactivation mechanism. (c) 2007 Elsevier B.V All rights reserved.
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页码：1144 / 1149
页数：6
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