Please use this identifier to cite or link to this item: http://hdl.handle.net/11717/7357
Title: Synthesis of multi-walled carbon nanotubes in high yield using Mm based AB2 alloy hydride catalysts and the effect of purification on their hydrogen adsorption properties
Authors: Shaijumon, M.M.
Rajalakshmi, N.
Ryu, H.
Ramaprabhu, S.
Keywords: Adsorption
Catalysts
High resolution electron microscopy
Hydrides
Hydrogen
Precipitation (chemical)
Purification
Pyrolysis
Raman spectroscopy
Scanning electron microscopy
Synthesis (chemical)
Transmission electron microscopy
X ray diffraction analysis
X ray photoelectron spectroscopy
Catalyst particles
Decrepitation
Hydrogen storage alloys
Multi-walled carbon nanotubes (MWNT)
Carbon nanotubes
Issue Date: 2005
Citation: Nanotechnology, 16(4), 518-524
Abstract: Catalytic synthesis of multi-walled carbon nanotubes (MWNTs) by the pyrolysis of acetylene over mischmetal (Mm) based MmNi2 and MmFe 2 hydride catalysts is reported. The hydrogen decrepitation technique has been used to prepare the catalyst particles of these Mm based hydrogen storage alloys. Large hydrogen decrepitation and low cost make these hydrides potential catalysts for large-scale production of CNTs. The samples were purified by air oxidation and acid treatment and were characterized by XRD, SEM, TEM, HRTEM, Raman spectroscopy and XPS. The yield of MWNTs was estimated to be ?60% and the purity of MWNTs thus obtained was more than 90%, as characterized by TGA. In addition, hydrogen adsorption measurements were carried out for as-prepared and purified MWNTs at 125 and 298 K using a high pressure hydrogen adsorption set-up. A maximum hydrogen storage capacity of 3.2 wt% at 60 bar is obtained at 125 K for purified CNTs prepared with MmFe2 hydride catalysts. ? 2005 IOP Publishing Ltd.
URI: http://dx.doi.org/10.1088/0957-4484/16/4/031
http://hdl.handle.net/11717/7357
ISSN: 9574484
Appears in Collections:Articles

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.