Abstract
Well-shaped faujasite-type zeolite (FAU) octahedral crystals 15 im in size were synthesized hydrothermally in an autoclave. The synthesis solution had a molar composition of 3.5 Na2O : Al2O3 : 2.1 SiO2 : 1000 H2O. With this zeolite being the template, multi-walled carbon nanotubes (MWNTs) were synthesized from Fe- and Co-supported zeolite (FAU) by catalytic chemical vapor deposition (CCVD) using acetylene as the carbon source. Field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and Raman spectroscopy investigations demonstrated a growth tendency in terms of the number of wall layers and yield of carbon nanotubes (CNTs) as the iron and cobalt contents were increased. It is inferred that Co is more effective than Fe for synthesizing high-quality CNTs.
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