Acetic acid effects on enhancement of growth rate and reduction of amorphous carbon deposition on CNT arrays along a growth window in a floating catalyst reactor |
| |
Authors: | Morteza Maghrebi Abbas Ali Khodadadi Yadollah Mortazavi Ali Sane Mohsen Rahimi Yaser Shirazi Zviad Tsakadze and Subodh Mhaisalkar |
| |
Institution: | (1) Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW Cambridge, UK;(2) Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands;(3) Department of Engineering, University of Cambridge, CB2 1PZ Cambridge, UK; |
| |
Abstract: | The mm-long carbon nanotube (CNT) arrays were grown in a floating catalyst reactor, using xylene-ferrocene and a small amount
of acetic acid as the feed. The CNT arrays deposited on a quartz substrate at several positions along the reactor were extensively
characterized using Raman spectroscopy, scanning electron microscopy, X-ray diffraction, high-resolution transmission electron
microscopy, and optical microscopy. Various characterization methods consistently reveal that the acetic acid additive to
the feed alleviates deposition of amorphous carbon layer, which gradually thickens CNTs along the reactor. The acetic acid
also resulted in a higher growth rate along the so-called growth window, where CNT arrays are deposited on the quartz substrate.
High-performance liquid chromatography of extracted byproducts (PAHs) confirmed the presence of some polycyclic aromatic hydrocarbons.
The solid weight of PAHs decreased upon addition of ferrocene as the catalyst precursor, as well as of acetic acid to xylene
feed. The results suggest that primary light products of xylene pyrolysis can be competitive reactants for both catalytic
and subsequent pyrolytic reactions. They may also be more efficient feeds for CNT growth than xylene itself. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|