eprintid: 9071
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/90/71
datestamp: 2023-11-09 16:21:01
lastmod: 2023-11-09 16:21:01
status_changed: 2023-11-09 16:14:12
type: article
metadata_visibility: show
creators_name: Shukrullah, S.
creators_name: Mohamed, N.M.
creators_name: Khan, Y.
creators_name: Naz, M.Y.
creators_name: Ghaffar, A.
creators_name: Ahmad, I.
title: Effect of Gas Flowrate on Nucleation Mechanism of MWCNTs for a Compound Catalyst
ispublished: pub
keywords: Alumina; Carbon nanotubes; Catalyst activity; Catalysts; Chemical vapor deposition; Ethylene; Fluidized beds; Yarn, Alumina support; Carbon precursors; Catalyst particles; Decomposition rate; Graphitic structures; Multiwalled carbon nanotube (MWCNTs); Nucleation mechanism; Tube morphology, Multiwalled carbon nanotubes (MWCN)
note: cited By 5
abstract: Activation of the catalyst particles during a CVD process can be anticipated from the carbon feeding rate. In this study, Fe2O3/Al2O3 catalyst was synthesized with uniformly dispersed iron over alumina support for onward production of multiwalled carbon nanotubes (MWCNTs) in a fluidized bed chemical CVD reactor. The effect of the ethylene flowrate on catalytic activity of the compound catalyst and morphology of the as-grown MWCNTs was also investigated in this study. The dispersed active phases of the catalyst and optimized gas flowrate helped in improving the tube morphology and prevented the aggregation of the as-grown MWCNTs. The flowrates, below 100 sccm, did not provide sufficient reactants to interact with the catalyst for production of defect-free CNT structures. Above 100 sccm, concentration of the carbon precursor did not show notable influence on decomposition rate of the gas molecules. The most promising results on growth and structural properties of MWCNTs were gained at ethylene flowrate of 100 sccm. At this flowrate, the ratio of G and D intensity peaks (IG/ID) was deliberated about 1.40, which indicates the growth of graphitic structures of MWCNTs. © 2017 S. Shukrullah et al.
date: 2017
publisher: Hindawi Limited
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85042695630&doi=10.1155%2f2017%2f3407352&partnerID=40&md5=518fa56976dda55259bb85c10d4fcb7b
id_number: 10.1155/2017/3407352
full_text_status: none
publication: Journal of Nanomaterials
volume: 2017
refereed: TRUE
issn: 16874110
citation:   Shukrullah, S. and Mohamed, N.M. and Khan, Y. and Naz, M.Y. and Ghaffar, A. and Ahmad, I.  (2017) Effect of Gas Flowrate on Nucleation Mechanism of MWCNTs for a Compound Catalyst.  Journal of Nanomaterials, 2017.   ISSN 16874110