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Bulk production of bamboo-shaped multi-walled carbon nanotubes via catalytic decomposition of methane over tri-metallic Ni-Co-Fe catalyst

Articles

Journal/Conference:

REACTION KINETICS MECHANISMS AND CATALYSIS

Language:

English

Author:

Allaedini Ghazaleh; Tasirin Siti Masrinda; Aminayi Payam; Yaakob Zahira; Talib Meor Zainal Meor

Year:

2015

Volume:

116

Issue:

2

Pages:

385-396

Keywords:

Tri-metallic catalyst; Methane decomposition; Bamboo shape carbon nanotubes; Multi-walled carbon nanotubes; Graphitization degree

In this work, bamboo-shaped, multi-walled carbon nanotubes were synthesized via methane decomposition over a Ni-Co-Fe tri-metallic catalyst at 1000 degrees C. The nitrogen absorption (BET), X-ray diffraction (XRD), and particle size analysis results of the catalyst were used to demonstrate the surface area, size distribution, and crystallinity of the sample. The scanning electron microscopy (SEM) micrographs of the nanocarbons deposited via methane decomposition indicated that highly uniform carbon nanotubes were grown on the surface of the tri-metallic catalyst. The transmission electron microscopy (TEM) images showed that the carbon nanotubes were multi-walled and bamboo-shaped with a diameter of similar to 20 nm. Raman spectra revealed the graphitization degree of the CNTs with an I-D/I-G of 1.84, indicative of the crystallinity of CNTs with structural defects. The thermal analysis shows the high oxidation stability of the multi-walled carbon nanotubes.