This work is a continuation and a completion of a previous study on the synthesis of multi-walled carbon nanotubes by iron-catalyzed chemical vapor deposition over sodium-exchanged K10-montmorillonite (Na+-K10) based catalysts. The influence of iron-addition (5-25 wt.%) on the catalyst performances is investigated. By comparing results here obtained by isobutane decomposition at 700 °C with those previously achieved at 600°C by using Fe/Al2O3 catalysts upon the same gas-flowing setup (120 cm 3/min 1:1 i-C4H10 + H2), it comes out that although in both the cases the best catalytic performance is obtained for a relative (to iron) carbon-supply of ≈ 160 wt.%/min, higher specific yield is achieved over alumina supported catalysts. The possible reasons for this difference are discussed in the light of the most recent assessments on nanotube growth.

Effect of Fe load on the synthesis of C nanotubes by isobutane decomposition over Na-exchanged montmorillonite-clay catalysts

SANTANGELO, Saveria;MESSINA, Giacomo;FAGGIO, GIULIANA
2012

Abstract

This work is a continuation and a completion of a previous study on the synthesis of multi-walled carbon nanotubes by iron-catalyzed chemical vapor deposition over sodium-exchanged K10-montmorillonite (Na+-K10) based catalysts. The influence of iron-addition (5-25 wt.%) on the catalyst performances is investigated. By comparing results here obtained by isobutane decomposition at 700 °C with those previously achieved at 600°C by using Fe/Al2O3 catalysts upon the same gas-flowing setup (120 cm 3/min 1:1 i-C4H10 + H2), it comes out that although in both the cases the best catalytic performance is obtained for a relative (to iron) carbon-supply of ≈ 160 wt.%/min, higher specific yield is achieved over alumina supported catalysts. The possible reasons for this difference are discussed in the light of the most recent assessments on nanotube growth.
Carbon nanotubes,; Chemical vapor deposition, ; Montmorillonite supports; Metal-load, ; Iron-catalysts
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12318/1796
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