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Identification of key parameters for the selective growth of single or double wall carbon nanotubes on FeMo/Al2O3 CVD catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43619 45979 2007 12 PDF Available
Title
Identification of key parameters for the selective growth of single or double wall carbon nanotubes on FeMo/Al2O3 CVD catalysts
Abstract

The successive organometallic chemical vapor deposition of metallic molybdenum and then iron from their carbonyl precursors at 220 °C on γ-alumina results in the formation of a bi-layered film on the alumina surface. These catalysts might be active for the selective synthesis of single or double wall carbon nanotubes from methane at 900 °C provided that (i) a fine tuning of the activation step is performed and (ii) the gas phase composition is carefully controlled. The negative influence of nitrogen on the selectivity towards SWCNT and DWCNT has been evidenced. Addition of hydrogen is harmful to SWCNT growth, whereas a low partial pressure of hydrogen is necessary to grow selectively DWCNT. These results can be rationalized in terms of kinetics of reduction of the active catalytic species. Based on XRD, Raman spectroscopy, XPS, FESEM/EDX and TEM analyses, a general pathway for SWCNT formation on the FeMo/Al2O3 CVD catalysts is proposed that involves the active mixed FeMoO4 oxide phase.

Graphical abstractOMCVD Fe–Mo/Al2O3 catalysts might be active for the selective synthesis of single or double wall carbon nanotubes from methane at 900 °C provided that a fine tuning of the activation step is performed and that the gas phase composition is carefully controlled. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Carbon nanotubes; Chemical vapor deposition; Iron molybdenum catalysts
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Identification of key parameters for the selective growth of single or double wall carbon nanotubes on FeMo/Al2O3 CVD catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 323, 30 April 2007, Pages 162–173
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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